{"query":{"parameter":"chlorine","place":"US-PA","medium":null,"statistic":null,"kind":null},"searched":{"places":["US-PA","US"],"parameter_keys":["cas:7782-50-5","name:chlorine,","cas:506-77-4","name:chlorine demand","cas:10049-04-4","name:chlorine, reactive species","cas:7790-91-2","name:free available chlorine","name:free residual chlorine","name:total chlorine residual","cas:88-73-3","cas:100-00-5","name:chlor, freies","name:chlordioxid und andere oxidantien","name:volatile halogenated hydrocarbons","cas:121-73-3","name:cloro attivo","name:cloro attivo libero","name:cloro residuo","cas:7647-01-0","name:chlore residuel total","cas:108171-26-2"],"names_matched":[["chlorine","cas:7782-50-5"],["chlorine","name:chlorine,"],["chlorine cyanide","cas:506-77-4"],["chlorine demand","name:chlorine demand"],["chlorine dioxide","cas:10049-04-4"],["chlorine reactive species","name:chlorine, reactive species"],["chlorine trifluoride","cas:7790-91-2"],["free available chlorine","name:free available chlorine"],["free residual chlorine","name:free residual chlorine"],["total chlorine residual","name:total chlorine residual"],["1 chlor 2 nitrobenzol","cas:88-73-3","chlor"],["1 chlor 4 nitrobenzol","cas:100-00-5","chlor"],["chlor freies","name:chlor, freies","chlor"],["chlordioxid und andere oxidantien angegeben als chlor","name:chlordioxid und andere oxidantien","chlor"],["lhkw summe aus trichlorethen tetrachlorethen 1 1 1 trichlorethan dichlormethan gerechnet als chlor","name:volatile halogenated hydrocarbons","chlor"],["1 cloro 2 nitrobenzene","cas:88-73-3","cloro"],["1 cloro 3 nitrobenzene","cas:121-73-3","cloro"],["1 cloro 4 nitrobenzene","cas:100-00-5","cloro"],["cloro attivo","name:cloro attivo","cloro"],["cloro attivo libero","name:cloro attivo libero","cloro"],["cloro residual libre","name:free residual chlorine","cloro"],["cloro residuo","name:cloro residuo","cloro"],["composti inorganici del cloro sotto forma di gas o vapore esclusi clorocianuro e fosgene espressi come acido cloridrico","cas:7647-01-0","cloro"],["chlore dioxyde de","cas:10049-04-4","chlore"],["chlore residuel total","name:chlore residuel total","chlore"],["chlore trifluorure de","cas:7790-91-2","chlore"],["paraffines chlorees c12 60 chlore","cas:108171-26-2","chlore"]],"match":"exact+contains","order":"The place's own instruments first, then each place above it, each in its register's order; rows for a marine receiving water after the rest, as none of the place's own rows names a marine, salt, estuarine, coastal or ocean water","not_sent":{"rows":35,"names":["CHLORONITROBENZENE, P-","Chloronitrobenzene, o-","Chloronitrobenzene, p-","~Cyanogen Chloride","Hydrogen Chloride"],"says":"35 rows share a parameter key with a longer name holding \"chlorine\" but are printed under names without these words (that key is wider than the name): not sent. Ask for one by its name or CAS number."}},"total":59,"offset":0,"returned":50,"next_offset":50,"rows":[{"id":"61e427bd3ae09dd9","parameter":"Total Residual Chlorine","value":"Four-day average 0.011 mg/l; 1-hour average 0.019 mg/l.","value_num":0.011,"unit":"mg/L","statistic":"four_day_avg","direction":"max","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"cas:7782-50-5","place":["US-PA"],"conditions":["critical use CWF, WWF, TSF, MF (cold water fishes, warm water fishes, trout stocking, migratory fishes): the designated or existing use the criterion protects (§93.7 Table 3)"],"cite":{"instrument":"us_pa_wqs","title":"25 Pa. Code §93.8c Table 5 (water quality criteria for toxic substances) and §93.7 Table 3 (specific water quality criteria) — Pennsylvania","issuer":"Commonwealth of Pennsylvania, Environmental Quality Board (Department of Environmental Protection)","edition":"Pennsylvania Code as served 2026-10-09: §93.8c amended December 19, 2025, effective December 20, 2025, 55 Pa.B. 8596; §93.7 rows name their own page","source_url":"https://www.pacodeandbulletin.gov/Display/pacode?file=/secure/pacode/data/025/chapter93/s93.8c.html","source_sha256":"9f8f9a0d4da400c55be6373f6a6482b24c4fab5c9a4d0c445f3f55c33a799beb","fetched_at":"2026-10-09","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"25 Pa. Code §93.7 Table 3 (TRC)","page":null,"quote":"Total Residual Chlorine TRC Four-day average 0.011 mg/l; 1-hour average 0.019 mg/l. CWF, WWF, TSF, MF * Critical Use: The designated or existing use the criteria are designed to protect. More stringent site-specific criteria may be developed to protect other more sensitive, intervening uses. (b) For naturally reproducing salmonids, protected early life stages include embryonic and larval stages and juvenile forms to 30 days after hatching. The DO 1 standard for naturally reproducing salmonid early life stages applies October 1 through May 31. The DO 1 standard for naturally reproducing salmonid early life stages applies unless it can be demonstrated to the Department’s satisfaction, that the following conditions are documented: 1) the absence of young of the year salmonids measuring less than 150 mm in the surface water; and 2) the absence of multiple age classes of salmonids in the surface water. These conditions only apply to salmonids resulting from natural reproduction occurring in the surface waters. Additional biological information may be considered by the Department which evaluates the presence or absence of early life stages. (c) The list of specific water quality criteria does not include all possible substances that could cause pollution. For substances not listed, the general criterion that these substances may not be inimical or injurious to the existing or designated water uses applies. The Department will develop a criterion for any substance not listed in Table 3 that is determined to be inimical or injurious to existing or designated water uses using the best available scientific information, as determined by the Department. (d) If the Department determines that natural quality of a surface water segment is of lower quality than the applicable aquatic life criteria in Table 3 or 5, the natural quality shall constitute the aquatic life criteria for that segment. All draft natural quality determinations will be published in the Pennsylvania Bulletin and be subject to a minimum 30-day comment period. The Department will maintain a publicly available list of surface waters and parameters where this subsection applies, and will, from time to time, submit appropriate amendments to § § 93.9a—93.9z. Authority The provisions of this § 93.7 amended under sections 5(b)(1) and 402 of The Clean Streams Law (35 P.S. § § 691.5(b)(1) and 691.402); and section 1920-A of The Administrative Code of 1929 (71 P.S. § 510-20). Source The provisions of this § 93.7 amended through March 8, 1985, effective February 16, 1985, 15 Pa.B. 907; amended March 10, 1989, effective March 11, 1989, 19 Pa.B. 968; amended February 11, 1994, effective February 12, 1994, 24 Pa.B. 832; amended April 3, 1998, effective November 4, 1995, 28 Pa.B. 1633; amended July 16, 1999, effective July 17, 1999, 29 Pa.B. 3720; amended November 17, 2000, effective November 18, 2000, 30 Pa.B. 6059; amended February 11, 2005, effective February 12, 2005, 35 Pa.B. 1197; amended January 5, 2007, effective January 6, 2007, 37 Pa.B. 11; amended May 15, 2009, effective May 16, 2009, 39 Pa.B. 2523; amended July 19, 2013, effective July 20, 2013, 43 Pa.B. 4080; amended July 10, 2020, effective July 11, 2020, 50 Pa.B. 3426; amended December 19, 2025, effective December 20, 2025, 55 Pa.B. 8596. Immediately preceding text appears at serial pages (401840) to (401845). Notes of Decisions The Department of Environmental Resources is not required to consider the economic consequences to a discharger in establishing water-quality based effluent limitations in a National Pollutant Discharge Elimination System (NPDES) Permit. Mathies Coal Company v. Department of Environmental Resources , 559 A.2d 506 (Pa. 1989). The water quality standards in 25 Pa. Code § 93.7 are to be considered only as one of the major factors in developing discharge limitations, and neither these standards nor effluent limitations based on them in case-by-case DER determinations require a presumption of validity. Lucas v. Department of Environmental Resources , 420 A.2d 1 (Pa. Cmwlth. 1980). Cross References This section cited in 25 Pa. Code § 93.4b (relating to qualifying as High Quality or Exceptional Value Waters); 25 Pa. Code § 93.8d (relating to development on site-specific water quality criteria); and 25 Pa. Code § 96.3 (relating to water quality protection requirements). No part of the information on this site may be reproduced for profit or sold for profit. This material has been drawn directly from the official Pennsylvania Code full text database. Due to the limitations of HTML or differences in display capabilities of different browsers, this version may differ slightly from the official printed version. Top Bottom No part of the information on this site may be reproduced forprofit or sold for profit. Please direct comments or questions to webmaster@PaBulletin.com Accessibility Privacy Disclaimer Style Manual Code Publication Schedule Bulletin Publication Schedule Accessibility | Privacy | Disclaimer | Style Manual | Code Publication Schedule | Bulletin Publication Schedule"}},{"id":"d237ebe7fc7616ba","parameter":"Total Residual Chlorine","value":"Four-day average 0.011 mg/l; 1-hour average 0.019 mg/l.","value_num":0.019,"unit":"mg/L","statistic":"hourly_avg","direction":"max","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"cas:7782-50-5","place":["US-PA"],"conditions":["critical use CWF, WWF, TSF, MF (cold water fishes, warm water fishes, trout stocking, migratory fishes): the designated or existing use the criterion protects (§93.7 Table 3)"],"cite":{"instrument":"us_pa_wqs","title":"25 Pa. Code §93.8c Table 5 (water quality criteria for toxic substances) and §93.7 Table 3 (specific water quality criteria) — Pennsylvania","issuer":"Commonwealth of Pennsylvania, Environmental Quality Board (Department of Environmental Protection)","edition":"Pennsylvania Code as served 2026-10-09: §93.8c amended December 19, 2025, effective December 20, 2025, 55 Pa.B. 8596; §93.7 rows name their own page","source_url":"https://www.pacodeandbulletin.gov/Display/pacode?file=/secure/pacode/data/025/chapter93/s93.8c.html","source_sha256":"9f8f9a0d4da400c55be6373f6a6482b24c4fab5c9a4d0c445f3f55c33a799beb","fetched_at":"2026-10-09","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"25 Pa. Code §93.7 Table 3 (TRC)","page":null,"quote":"Total Residual Chlorine TRC Four-day average 0.011 mg/l; 1-hour average 0.019 mg/l. CWF, WWF, TSF, MF * Critical Use: The designated or existing use the criteria are designed to protect. More stringent site-specific criteria may be developed to protect other more sensitive, intervening uses. (b) For naturally reproducing salmonids, protected early life stages include embryonic and larval stages and juvenile forms to 30 days after hatching. The DO 1 standard for naturally reproducing salmonid early life stages applies October 1 through May 31. The DO 1 standard for naturally reproducing salmonid early life stages applies unless it can be demonstrated to the Department’s satisfaction, that the following conditions are documented: 1) the absence of young of the year salmonids measuring less than 150 mm in the surface water; and 2) the absence of multiple age classes of salmonids in the surface water. These conditions only apply to salmonids resulting from natural reproduction occurring in the surface waters. Additional biological information may be considered by the Department which evaluates the presence or absence of early life stages. (c) The list of specific water quality criteria does not include all possible substances that could cause pollution. For substances not listed, the general criterion that these substances may not be inimical or injurious to the existing or designated water uses applies. The Department will develop a criterion for any substance not listed in Table 3 that is determined to be inimical or injurious to existing or designated water uses using the best available scientific information, as determined by the Department. (d) If the Department determines that natural quality of a surface water segment is of lower quality than the applicable aquatic life criteria in Table 3 or 5, the natural quality shall constitute the aquatic life criteria for that segment. All draft natural quality determinations will be published in the Pennsylvania Bulletin and be subject to a minimum 30-day comment period. The Department will maintain a publicly available list of surface waters and parameters where this subsection applies, and will, from time to time, submit appropriate amendments to § § 93.9a—93.9z. Authority The provisions of this § 93.7 amended under sections 5(b)(1) and 402 of The Clean Streams Law (35 P.S. § § 691.5(b)(1) and 691.402); and section 1920-A of The Administrative Code of 1929 (71 P.S. § 510-20). Source The provisions of this § 93.7 amended through March 8, 1985, effective February 16, 1985, 15 Pa.B. 907; amended March 10, 1989, effective March 11, 1989, 19 Pa.B. 968; amended February 11, 1994, effective February 12, 1994, 24 Pa.B. 832; amended April 3, 1998, effective November 4, 1995, 28 Pa.B. 1633; amended July 16, 1999, effective July 17, 1999, 29 Pa.B. 3720; amended November 17, 2000, effective November 18, 2000, 30 Pa.B. 6059; amended February 11, 2005, effective February 12, 2005, 35 Pa.B. 1197; amended January 5, 2007, effective January 6, 2007, 37 Pa.B. 11; amended May 15, 2009, effective May 16, 2009, 39 Pa.B. 2523; amended July 19, 2013, effective July 20, 2013, 43 Pa.B. 4080; amended July 10, 2020, effective July 11, 2020, 50 Pa.B. 3426; amended December 19, 2025, effective December 20, 2025, 55 Pa.B. 8596. Immediately preceding text appears at serial pages (401840) to (401845). Notes of Decisions The Department of Environmental Resources is not required to consider the economic consequences to a discharger in establishing water-quality based effluent limitations in a National Pollutant Discharge Elimination System (NPDES) Permit. Mathies Coal Company v. Department of Environmental Resources , 559 A.2d 506 (Pa. 1989). The water quality standards in 25 Pa. Code § 93.7 are to be considered only as one of the major factors in developing discharge limitations, and neither these standards nor effluent limitations based on them in case-by-case DER determinations require a presumption of validity. Lucas v. Department of Environmental Resources , 420 A.2d 1 (Pa. Cmwlth. 1980). Cross References This section cited in 25 Pa. Code § 93.4b (relating to qualifying as High Quality or Exceptional Value Waters); 25 Pa. Code § 93.8d (relating to development on site-specific water quality criteria); and 25 Pa. Code § 96.3 (relating to water quality protection requirements). No part of the information on this site may be reproduced for profit or sold for profit. This material has been drawn directly from the official Pennsylvania Code full text database. Due to the limitations of HTML or differences in display capabilities of different browsers, this version may differ slightly from the official printed version. Top Bottom No part of the information on this site may be reproduced forprofit or sold for profit. Please direct comments or questions to webmaster@PaBulletin.com Accessibility Privacy Disclaimer Style Manual Code Publication Schedule Bulletin Publication Schedule Accessibility | Privacy | Disclaimer | Style Manual | Code Publication Schedule | Bulletin Publication Schedule"}},{"id":"1025b17cef898b5b","parameter":"Total Residual Chlorine","value":"0.0032","value_num":0.0032,"unit":"Kg/kkg (or pounds per 1,000 lb) of product","statistic":"daily_max","direction":"max","kind":"limit","medium":"water_discharge","level":"national","route":"direct","parameter_key":"cas:7782-50-5","place":["US"],"conditions":["route is direct","cites is 40 CFR 415","the discharge is of the Subpart F—Chlor-alkali Subcategory (Chlorine and Sodium or Potassium Hydroxide Production)","existing sources (BAT)","table: Subpart F—Chlor-Alkali-Mercury Cells"],"cite":{"instrument":"us_40cfr415","title":"40 CFR Part 415 — PART 415—INORGANIC CHEMICALS MANUFACTURING POINT SOURCE CATEGORY","issuer":"U.S. Environmental Protection Agency","edition":"eCFR as of 2026-08-01","source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-40.xml?part=415","source_sha256":"ebf67428a51e85f12785b92d537e6878c5f9838c87722ac2db82b3db673d1e23","fetched_at":"2026-09-24","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"40 CFR 415.63 (BAT)","page":null,"quote":"Total Residual Chlorine 0.0032 0.0019"}},{"id":"bba56a6ffde95910","parameter":"Total Residual Chlorine","value":"0.0019","value_num":0.0019,"unit":"Kg/kkg (or pounds per 1,000 lb) of product","statistic":"monthly_avg","direction":"max","kind":"limit","medium":"water_discharge","level":"national","route":"direct","parameter_key":"cas:7782-50-5","place":["US"],"conditions":["route is direct","cites is 40 CFR 415","the discharge is of the Subpart F—Chlor-alkali Subcategory (Chlorine and Sodium or Potassium Hydroxide Production)","existing sources (BAT)","table: Subpart F—Chlor-Alkali-Mercury Cells"],"cite":{"instrument":"us_40cfr415","title":"40 CFR Part 415 — PART 415—INORGANIC CHEMICALS MANUFACTURING POINT SOURCE CATEGORY","issuer":"U.S. Environmental Protection Agency","edition":"eCFR as of 2026-08-01","source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-40.xml?part=415","source_sha256":"ebf67428a51e85f12785b92d537e6878c5f9838c87722ac2db82b3db673d1e23","fetched_at":"2026-09-24","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"40 CFR 415.63 (BAT)","page":null,"quote":"Total Residual Chlorine 0.0032 0.0019"}},{"id":"dbbe89c278e01110","parameter":"Total Residual Chlorine","value":"0.013","value_num":0.013,"unit":"Kg/kkg (or pounds per 1,000 lb) of product","statistic":"daily_max","direction":"max","kind":"limit","medium":"water_discharge","level":"national","route":"direct","parameter_key":"cas:7782-50-5","place":["US"],"conditions":["route is direct","cites is 40 CFR 415","the discharge is of the Subpart F—Chlor-alkali Subcategory (Chlorine and Sodium or Potassium Hydroxide Production)","existing sources (BAT)","table: Subpart F—Chlor-Alkali-Diaphragm Cells"],"cite":{"instrument":"us_40cfr415","title":"40 CFR Part 415 — PART 415—INORGANIC CHEMICALS MANUFACTURING POINT SOURCE CATEGORY","issuer":"U.S. Environmental Protection Agency","edition":"eCFR as of 2026-08-01","source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-40.xml?part=415","source_sha256":"ebf67428a51e85f12785b92d537e6878c5f9838c87722ac2db82b3db673d1e23","fetched_at":"2026-09-24","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"40 CFR 415.63 (BAT)","page":null,"quote":"Total Residual Chlorine 0.013 0.0079"}},{"id":"56d9f354d00e89cb","parameter":"Total Residual Chlorine","value":"0.0079","value_num":0.0079,"unit":"Kg/kkg (or pounds per 1,000 lb) of product","statistic":"monthly_avg","direction":"max","kind":"limit","medium":"water_discharge","level":"national","route":"direct","parameter_key":"cas:7782-50-5","place":["US"],"conditions":["route is direct","cites is 40 CFR 415","the discharge is of the Subpart F—Chlor-alkali Subcategory (Chlorine and Sodium or Potassium Hydroxide Production)","existing sources (BAT)","table: Subpart F—Chlor-Alkali-Diaphragm Cells"],"cite":{"instrument":"us_40cfr415","title":"40 CFR Part 415 — PART 415—INORGANIC CHEMICALS MANUFACTURING POINT SOURCE CATEGORY","issuer":"U.S. Environmental Protection Agency","edition":"eCFR as of 2026-08-01","source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-40.xml?part=415","source_sha256":"ebf67428a51e85f12785b92d537e6878c5f9838c87722ac2db82b3db673d1e23","fetched_at":"2026-09-24","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"40 CFR 415.63 (BAT)","page":null,"quote":"Total Residual Chlorine 0.013 0.0079"}},{"id":"a5fca0ea3a284be7","parameter":"Total Residual Chlorine","value":"0.0032","value_num":0.0032,"unit":"Kq/kkg (or pounds per 1,000 lb) of product","statistic":"daily_max","direction":"max","kind":"limit","medium":"water_discharge","level":"national","route":"direct","parameter_key":"cas:7782-50-5","place":["US"],"conditions":["route is direct","cites is 40 CFR 415","the discharge is of the Subpart F—Chlor-alkali Subcategory (Chlorine and Sodium or Potassium Hydroxide Production)","new sources (NSPS)","(a) Any new source subject to this subpart and using the mercury cell process must achieve the following new source performance standards (NSPS):","table: Subpart F—Chlor-Alkali-Mercury Cells"],"cite":{"instrument":"us_40cfr415","title":"40 CFR Part 415 — PART 415—INORGANIC CHEMICALS MANUFACTURING POINT SOURCE CATEGORY","issuer":"U.S. Environmental Protection Agency","edition":"eCFR as of 2026-08-01","source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-40.xml?part=415","source_sha256":"ebf67428a51e85f12785b92d537e6878c5f9838c87722ac2db82b3db673d1e23","fetched_at":"2026-09-24","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"40 CFR 415.65 (NSPS)","page":null,"quote":"Total Residual Chlorine 0.0032 0.0019"}},{"id":"f9c3abeac431cf44","parameter":"Total Residual Chlorine","value":"0.0019","value_num":0.0019,"unit":"Kq/kkg (or pounds per 1,000 lb) of product","statistic":"monthly_avg","direction":"max","kind":"limit","medium":"water_discharge","level":"national","route":"direct","parameter_key":"cas:7782-50-5","place":["US"],"conditions":["route is direct","cites is 40 CFR 415","the discharge is of the Subpart F—Chlor-alkali Subcategory (Chlorine and Sodium or Potassium Hydroxide Production)","new sources (NSPS)","(a) Any new source subject to this subpart and using the mercury cell process must achieve the following new source performance standards (NSPS):","table: Subpart F—Chlor-Alkali-Mercury Cells"],"cite":{"instrument":"us_40cfr415","title":"40 CFR Part 415 — PART 415—INORGANIC CHEMICALS MANUFACTURING POINT SOURCE CATEGORY","issuer":"U.S. Environmental Protection Agency","edition":"eCFR as of 2026-08-01","source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-40.xml?part=415","source_sha256":"ebf67428a51e85f12785b92d537e6878c5f9838c87722ac2db82b3db673d1e23","fetched_at":"2026-09-24","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"40 CFR 415.65 (NSPS)","page":null,"quote":"Total Residual Chlorine 0.0032 0.0019"}},{"id":"e64aeac5e9de69bc","parameter":"Total Residual Chlorine","value":"0.013","value_num":0.013,"unit":"Kq/kkg (or pounds per 1,000 lb) of product","statistic":"daily_max","direction":"max","kind":"limit","medium":"water_discharge","level":"national","route":"direct","parameter_key":"cas:7782-50-5","place":["US"],"conditions":["route is direct","cites is 40 CFR 415","the discharge is of the Subpart F—Chlor-alkali Subcategory (Chlorine and Sodium or Potassium Hydroxide Production)","new sources (NSPS)","(b) Any new source subject to this subpart and using the diaphragm cell process must achieve the following new source performance standards (NSPS):","table: Subpart F—Chlor-Alkali-Diaphragm Cells"],"cite":{"instrument":"us_40cfr415","title":"40 CFR Part 415 — PART 415—INORGANIC CHEMICALS MANUFACTURING POINT SOURCE CATEGORY","issuer":"U.S. Environmental Protection Agency","edition":"eCFR as of 2026-08-01","source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-40.xml?part=415","source_sha256":"ebf67428a51e85f12785b92d537e6878c5f9838c87722ac2db82b3db673d1e23","fetched_at":"2026-09-24","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"40 CFR 415.65 (NSPS)","page":null,"quote":"Total Residual Chlorine 0.013 0.0079"}},{"id":"33827060605599cd","parameter":"Total Residual Chlorine","value":"0.0079","value_num":0.0079,"unit":"Kq/kkg (or pounds per 1,000 lb) of product","statistic":"monthly_avg","direction":"max","kind":"limit","medium":"water_discharge","level":"national","route":"direct","parameter_key":"cas:7782-50-5","place":["US"],"conditions":["route is direct","cites is 40 CFR 415","the discharge is of the Subpart F—Chlor-alkali Subcategory (Chlorine and Sodium or Potassium Hydroxide Production)","new sources (NSPS)","(b) Any new source subject to this subpart and using the diaphragm cell process must achieve the following new source performance standards (NSPS):","table: Subpart F—Chlor-Alkali-Diaphragm Cells"],"cite":{"instrument":"us_40cfr415","title":"40 CFR Part 415 — PART 415—INORGANIC CHEMICALS MANUFACTURING POINT SOURCE CATEGORY","issuer":"U.S. Environmental Protection Agency","edition":"eCFR as of 2026-08-01","source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-40.xml?part=415","source_sha256":"ebf67428a51e85f12785b92d537e6878c5f9838c87722ac2db82b3db673d1e23","fetched_at":"2026-09-24","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"40 CFR 415.65 (NSPS)","page":null,"quote":"Total Residual Chlorine 0.013 0.0079"}},{"id":"f518716ad3fc3940","parameter":"Total Residual Chlorine","value":"0.086","value_num":0.086,"unit":"Kg/kkg (or pounds per 1,000 lb) of product","statistic":"daily_max","direction":"max","kind":"limit","medium":"water_discharge","level":"national","route":"direct","parameter_key":"cas:7782-50-5","place":["US"],"conditions":["route is direct","cites is 40 CFR 415","the discharge is of the Subpart AP—Hydrogen Cyanide Production Subcategory","existing sources (BAT)","table: Subpart AP—Hydrogen Cyanide"],"cite":{"instrument":"us_40cfr415","title":"40 CFR Part 415 — PART 415—INORGANIC CHEMICALS MANUFACTURING POINT SOURCE CATEGORY","issuer":"U.S. Environmental Protection Agency","edition":"eCFR as of 2026-08-01","source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-40.xml?part=415","source_sha256":"ebf67428a51e85f12785b92d537e6878c5f9838c87722ac2db82b3db673d1e23","fetched_at":"2026-09-24","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"40 CFR 415.423 (BAT)","page":null,"quote":"Total Residual Chlorine 0.086 0.051"}},{"id":"83426d3e30e49da2","parameter":"Total Residual Chlorine","value":"0.051","value_num":0.051,"unit":"Kg/kkg (or pounds per 1,000 lb) of product","statistic":"monthly_avg","direction":"max","kind":"limit","medium":"water_discharge","level":"national","route":"direct","parameter_key":"cas:7782-50-5","place":["US"],"conditions":["route is direct","cites is 40 CFR 415","the discharge is of the Subpart AP—Hydrogen Cyanide Production Subcategory","existing sources (BAT)","table: Subpart AP—Hydrogen Cyanide"],"cite":{"instrument":"us_40cfr415","title":"40 CFR Part 415 — PART 415—INORGANIC CHEMICALS MANUFACTURING POINT SOURCE CATEGORY","issuer":"U.S. Environmental Protection Agency","edition":"eCFR as of 2026-08-01","source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-40.xml?part=415","source_sha256":"ebf67428a51e85f12785b92d537e6878c5f9838c87722ac2db82b3db673d1e23","fetched_at":"2026-09-24","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"40 CFR 415.423 (BAT)","page":null,"quote":"Total Residual Chlorine 0.086 0.051"}},{"id":"48b10cc1fb3daf14","parameter":"Total Residual Chlorine","value":"0.086","value_num":0.086,"unit":"Kg/kkg (or pounds per 1,000 lb) of product","statistic":"daily_max","direction":"max","kind":"limit","medium":"water_discharge","level":"national","route":"direct","parameter_key":"cas:7782-50-5","place":["US"],"conditions":["route is direct","cites is 40 CFR 415","the discharge is of the Subpart AP—Hydrogen Cyanide Production Subcategory","new sources (NSPS)","Any new source subject to this subpart must achieve the following new source performance standards (NSPS):","table: Subpart AP—Hydrogen Cyanide"],"cite":{"instrument":"us_40cfr415","title":"40 CFR Part 415 — PART 415—INORGANIC CHEMICALS MANUFACTURING POINT SOURCE CATEGORY","issuer":"U.S. Environmental Protection Agency","edition":"eCFR as of 2026-08-01","source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-40.xml?part=415","source_sha256":"ebf67428a51e85f12785b92d537e6878c5f9838c87722ac2db82b3db673d1e23","fetched_at":"2026-09-24","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"40 CFR 415.425 (NSPS)","page":null,"quote":"Total Residual Chlorine 0.086 0.051"}},{"id":"d04436693a6fb71e","parameter":"Total Residual Chlorine","value":"0.051","value_num":0.051,"unit":"Kg/kkg (or pounds per 1,000 lb) of product","statistic":"monthly_avg","direction":"max","kind":"limit","medium":"water_discharge","level":"national","route":"direct","parameter_key":"cas:7782-50-5","place":["US"],"conditions":["route is direct","cites is 40 CFR 415","the discharge is of the Subpart AP—Hydrogen Cyanide Production Subcategory","new sources (NSPS)","Any new source subject to this subpart must achieve the following new source performance standards (NSPS):","table: Subpart AP—Hydrogen Cyanide"],"cite":{"instrument":"us_40cfr415","title":"40 CFR Part 415 — PART 415—INORGANIC CHEMICALS MANUFACTURING POINT SOURCE CATEGORY","issuer":"U.S. Environmental Protection Agency","edition":"eCFR as of 2026-08-01","source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-40.xml?part=415","source_sha256":"ebf67428a51e85f12785b92d537e6878c5f9838c87722ac2db82b3db673d1e23","fetched_at":"2026-09-24","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"40 CFR 415.425 (NSPS)","page":null,"quote":"Total Residual Chlorine 0.086 0.051"}},{"id":"d5ae0daca7b6fb8e","parameter":"Chlorine (total residual)","value":"0.0041","value_num":0.0041,"unit":"Kg/kkg (or pounds per/1,000 lb) of product","statistic":"daily_max","direction":"max","kind":"limit","medium":"water_discharge","level":"national","route":"direct","parameter_key":"cas:7782-50-5","place":["US"],"conditions":["route is direct","cites is 40 CFR 415","the discharge is of the Subpart BN—Sodium Chlorate Production Subcategory","existing sources (BPT)","table: Subpart BN—Sodium Chlorate"],"cite":{"instrument":"us_40cfr415","title":"40 CFR Part 415 — PART 415—INORGANIC CHEMICALS MANUFACTURING POINT SOURCE CATEGORY","issuer":"U.S. Environmental Protection Agency","edition":"eCFR as of 2026-08-01","source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-40.xml?part=415","source_sha256":"ebf67428a51e85f12785b92d537e6878c5f9838c87722ac2db82b3db673d1e23","fetched_at":"2026-09-24","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"40 CFR 415.662 (BPT)","page":null,"quote":"Chlorine (total residual) 0.0041 0.0024"}},{"id":"4ebf8079f4e677b2","parameter":"Chlorine (total residual)","value":"0.0024","value_num":0.0024,"unit":"Kg/kkg (or pounds per/1,000 lb) of product","statistic":"monthly_avg","direction":"max","kind":"limit","medium":"water_discharge","level":"national","route":"direct","parameter_key":"cas:7782-50-5","place":["US"],"conditions":["route is direct","cites is 40 CFR 415","the discharge is of the Subpart BN—Sodium Chlorate Production Subcategory","existing sources (BPT)","table: Subpart BN—Sodium Chlorate"],"cite":{"instrument":"us_40cfr415","title":"40 CFR Part 415 — PART 415—INORGANIC CHEMICALS MANUFACTURING POINT SOURCE CATEGORY","issuer":"U.S. Environmental Protection Agency","edition":"eCFR as of 2026-08-01","source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-40.xml?part=415","source_sha256":"ebf67428a51e85f12785b92d537e6878c5f9838c87722ac2db82b3db673d1e23","fetched_at":"2026-09-24","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"40 CFR 415.662 (BPT)","page":null,"quote":"Chlorine (total residual) 0.0041 0.0024"}},{"id":"1d8165d0a0d14fb0","parameter":"Chlorine (total residual)","value":"0.0041","value_num":0.0041,"unit":"Kg/kkg (or pounds per/1,000 lb) of product","statistic":"daily_max","direction":"max","kind":"limit","medium":"water_discharge","level":"national","route":"direct","parameter_key":"cas:7782-50-5","place":["US"],"conditions":["route is direct","cites is 40 CFR 415","the discharge is of the Subpart BN—Sodium Chlorate Production Subcategory","existing sources (BAT)","table: Subpart BN—Sodium Chlorate"],"cite":{"instrument":"us_40cfr415","title":"40 CFR Part 415 — PART 415—INORGANIC CHEMICALS MANUFACTURING POINT SOURCE CATEGORY","issuer":"U.S. Environmental Protection Agency","edition":"eCFR as of 2026-08-01","source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-40.xml?part=415","source_sha256":"ebf67428a51e85f12785b92d537e6878c5f9838c87722ac2db82b3db673d1e23","fetched_at":"2026-09-24","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"40 CFR 415.663 (BAT)","page":null,"quote":"Chlorine (total residual) 0.0041 0.0024"}},{"id":"68219fd82b653e03","parameter":"Chlorine (total residual)","value":"0.0024","value_num":0.0024,"unit":"Kg/kkg (or pounds per/1,000 lb) of product","statistic":"monthly_avg","direction":"max","kind":"limit","medium":"water_discharge","level":"national","route":"direct","parameter_key":"cas:7782-50-5","place":["US"],"conditions":["route is direct","cites is 40 CFR 415","the discharge is of the Subpart BN—Sodium Chlorate Production Subcategory","existing sources (BAT)","table: Subpart BN—Sodium Chlorate"],"cite":{"instrument":"us_40cfr415","title":"40 CFR Part 415 — PART 415—INORGANIC CHEMICALS MANUFACTURING POINT SOURCE CATEGORY","issuer":"U.S. Environmental Protection Agency","edition":"eCFR as of 2026-08-01","source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-40.xml?part=415","source_sha256":"ebf67428a51e85f12785b92d537e6878c5f9838c87722ac2db82b3db673d1e23","fetched_at":"2026-09-24","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"40 CFR 415.663 (BAT)","page":null,"quote":"Chlorine (total residual) 0.0041 0.0024"}},{"id":"ac6ebf7d08780c1f","parameter":"Chlorine (total residual)","value":"0.0041","value_num":0.0041,"unit":"Kg/kkg (or pounds per/1,000 lb) of product","statistic":"daily_max","direction":"max","kind":"limit","medium":"water_discharge","level":"national","route":"direct","parameter_key":"cas:7782-50-5","place":["US"],"conditions":["route is direct","cites is 40 CFR 415","the discharge is of the Subpart BN—Sodium Chlorate Production Subcategory","new sources (NSPS)","Any new source subject to this subpart must achieve the following new source performance standards (NSPS):","table: Subpart BN—Sodium Chlorate"],"cite":{"instrument":"us_40cfr415","title":"40 CFR Part 415 — PART 415—INORGANIC CHEMICALS MANUFACTURING POINT SOURCE CATEGORY","issuer":"U.S. Environmental Protection Agency","edition":"eCFR as of 2026-08-01","source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-40.xml?part=415","source_sha256":"ebf67428a51e85f12785b92d537e6878c5f9838c87722ac2db82b3db673d1e23","fetched_at":"2026-09-24","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"40 CFR 415.665 (NSPS)","page":null,"quote":"Chlorine (total residual) 0.0041 0.0024"}},{"id":"30320495e0c2b011","parameter":"Chlorine (total residual)","value":"0.0024","value_num":0.0024,"unit":"Kg/kkg (or pounds per/1,000 lb) of product","statistic":"monthly_avg","direction":"max","kind":"limit","medium":"water_discharge","level":"national","route":"direct","parameter_key":"cas:7782-50-5","place":["US"],"conditions":["route is direct","cites is 40 CFR 415","the discharge is of the Subpart BN—Sodium Chlorate Production Subcategory","new sources (NSPS)","Any new source subject to this subpart must achieve the following new source performance standards (NSPS):","table: Subpart BN—Sodium Chlorate"],"cite":{"instrument":"us_40cfr415","title":"40 CFR Part 415 — PART 415—INORGANIC CHEMICALS MANUFACTURING POINT SOURCE CATEGORY","issuer":"U.S. Environmental Protection Agency","edition":"eCFR as of 2026-08-01","source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-40.xml?part=415","source_sha256":"ebf67428a51e85f12785b92d537e6878c5f9838c87722ac2db82b3db673d1e23","fetched_at":"2026-09-24","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"40 CFR 415.665 (NSPS)","page":null,"quote":"Chlorine (total residual) 0.0041 0.0024"}},{"id":"180458aeeefaf8d6","parameter":"TRC","value":"0.000250","value_num":0.00025,"unit":"Pounds per thousand lb of product","statistic":"daily_max","direction":"max","kind":"limit","medium":"water_discharge","level":"national","route":"direct","parameter_key":"cas:7782-50-5","place":["US"],"conditions":["route is direct","cites is 40 CFR 420","the discharge is of the Subpart B—Sintering Subcategory","existing sources (BAT)","(a) Sintering operations with wet air pollution control system. The following table presents BAT limitations for sintering operations with wet air pollution control systems:","table: Subpart B—Effluent Limitations (BAT)"],"cite":{"instrument":"us_40cfr420","title":"40 CFR Part 420 — PART 420—IRON AND STEEL MANUFACTURING POINT SOURCE CATEGORY","issuer":"U.S. Environmental Protection Agency","edition":"eCFR as of 2026-10-05","source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-10-05/title-40.xml?part=420","source_sha256":"15d00b2386811ecfdcc8334d57defe2f690d2f88798390abff59228c5aea1898","fetched_at":"2026-10-09","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"40 CFR 420.23 (BAT)","page":null,"quote":"TRC 3 0.000250"}},{"id":"388cdf41b7481da3","parameter":"TRC","value":"0.000250","value_num":0.00025,"unit":"Pounds per thousand lb of product","statistic":"daily_max","direction":"max","kind":"limit","medium":"water_discharge","level":"national","route":"direct","parameter_key":"cas:7782-50-5","place":["US"],"conditions":["route is direct","cites is 40 CFR 420","the discharge is of the Subpart B—Sintering Subcategory","new sources (NSPS)","(1) Sintering operations with wet air pollution control system. The following table presents NSPS for sintering operations with wet air pollution control systems:","table: Subpart B—New Source Performance Standards (NSPS)"],"cite":{"instrument":"us_40cfr420","title":"40 CFR Part 420 — PART 420—IRON AND STEEL MANUFACTURING POINT SOURCE CATEGORY","issuer":"U.S. Environmental Protection Agency","edition":"eCFR as of 2026-10-05","source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-10-05/title-40.xml?part=420","source_sha256":"15d00b2386811ecfdcc8334d57defe2f690d2f88798390abff59228c5aea1898","fetched_at":"2026-10-09","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"40 CFR 420.24 (NSPS)","page":null,"quote":"TRC 3 0.000250"}},{"id":"38a7d6ed1cde7eff","parameter":"TRC","value":"0.000146","value_num":0.000146,"unit":"Kg/kkg (pounds per 1,000 lb) of product","statistic":"daily_max","direction":"max","kind":"limit","medium":"water_discharge","level":"national","route":"direct","parameter_key":"cas:7782-50-5","place":["US"],"conditions":["route is direct","cites is 40 CFR 420","the discharge is of the Subpart C—Ironmaking Subcategory","existing sources (BAT)","(a) Iron blast furnace.","table: Subpart C"],"cite":{"instrument":"us_40cfr420","title":"40 CFR Part 420 — PART 420—IRON AND STEEL MANUFACTURING POINT SOURCE CATEGORY","issuer":"U.S. Environmental Protection Agency","edition":"eCFR as of 2026-10-05","source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-10-05/title-40.xml?part=420","source_sha256":"15d00b2386811ecfdcc8334d57defe2f690d2f88798390abff59228c5aea1898","fetched_at":"2026-10-09","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"40 CFR 420.33 (BAT)","page":null,"quote":"TRC 1 0.000146"}},{"id":"e79004f5f95ddebf","parameter":"TRC","value":"0.000146","value_num":0.000146,"unit":"Kg/kkg (pounds per 1,000 lb) of products","statistic":"daily_max","direction":"max","kind":"limit","medium":"water_discharge","level":"national","route":"direct","parameter_key":"cas:7782-50-5","place":["US"],"conditions":["route is direct","cites is 40 CFR 420","the discharge is of the Subpart C—Ironmaking Subcategory","new sources (NSPS)","(a) Iron blast furnace.","table: Subpart C"],"cite":{"instrument":"us_40cfr420","title":"40 CFR Part 420 — PART 420—IRON AND STEEL MANUFACTURING POINT SOURCE CATEGORY","issuer":"U.S. Environmental Protection Agency","edition":"eCFR as of 2026-10-05","source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-10-05/title-40.xml?part=420","source_sha256":"15d00b2386811ecfdcc8334d57defe2f690d2f88798390abff59228c5aea1898","fetched_at":"2026-10-09","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"40 CFR 420.34 (NSPS)","page":null,"quote":"TRC 1 0.000146"}},{"id":"9963c1624bcbd3ec","parameter":"Total residual chlorine","value":"0.20","value_num":0.2,"unit":"mg/L","direction":"max","kind":"limit","medium":"water_discharge","level":"national","route":"direct","parameter_key":"cas:7782-50-5","place":["US"],"conditions":["route is direct","cites is 40 CFR 423","existing sources (BAT)","(b)(1) For any plant with a total rated electric generating capacity of 25 or more megawatts, the quantity of pollutants discharged in once through cooling water from each discharge point shall not exceed the quantity determined by multiplying the flow of once through cooling water from each discharge point times the concentration listed in the following table:"],"cite":{"instrument":"us_40cfr423","title":"40 CFR Part 423 — PART 423—STEAM ELECTRIC POWER GENERATING POINT SOURCE CATEGORY","issuer":"U.S. Environmental Protection Agency","edition":"eCFR as of 2026-10-05","source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-10-05/title-40.xml?part=423","source_sha256":"60cadc14b8fc25c39238a9d55cede55743d6b349ca20c8f8158b0f7e5d98fd64","fetched_at":"2026-10-09","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"40 CFR 423.13 (BAT)","page":null,"quote":"Total residual chlorine 0.20"}},{"id":"307758ad65665996","parameter":"Total residual chlorine","value":"0.20","value_num":0.2,"unit":"mg/L","direction":"max","kind":"limit","medium":"water_discharge","level":"national","route":"direct","parameter_key":"cas:7782-50-5","place":["US"],"conditions":["route is direct","cites is 40 CFR 423","new sources (NSPS)","(8)(i) Once through cooling water. For any plant with a total rated electric generating capacity of 25 or more megawatts, the quantity of pollutants discharged in once through cooling water from each discharge point shall not exceed the quantity determined by multiplying the flow of once through cooling water from each discharge point times the concentration listed in the following table:"],"cite":{"instrument":"us_40cfr423","title":"40 CFR Part 423 — PART 423—STEAM ELECTRIC POWER GENERATING POINT SOURCE CATEGORY","issuer":"U.S. Environmental Protection Agency","edition":"eCFR as of 2026-10-05","source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-10-05/title-40.xml?part=423","source_sha256":"60cadc14b8fc25c39238a9d55cede55743d6b349ca20c8f8158b0f7e5d98fd64","fetched_at":"2026-10-09","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"40 CFR 423.15 (NSPS)","page":null,"quote":"Total residual chlorine 0.20"}},{"id":"d357b30ee40e50b0","parameter":"Total residual chlorine","value":"0.20","value_num":0.2,"unit":"mg/L","direction":"max","kind":"limit","medium":"water_discharge","level":"national","route":"direct","parameter_key":"cas:7782-50-5","place":["US"],"conditions":["route is direct","cites is 40 CFR 423","new sources (NSPS)","(8)(i) Once through cooling water. For any plant with a total rated electric generating capacity of 25 or more megawatts, the quantity of pollutants discharged in once through cooling water from each discharge point shall not exceed the quantity determined by multiplying the flow of once through cooling water from each discharge point times the concentration listed in the following table:"],"cite":{"instrument":"us_40cfr423","title":"40 CFR Part 423 — PART 423—STEAM ELECTRIC POWER GENERATING POINT SOURCE CATEGORY","issuer":"U.S. Environmental Protection Agency","edition":"eCFR as of 2026-10-05","source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-10-05/title-40.xml?part=423","source_sha256":"60cadc14b8fc25c39238a9d55cede55743d6b349ca20c8f8158b0f7e5d98fd64","fetched_at":"2026-10-09","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"40 CFR 423.15 (NSPS)","page":null,"quote":"Total residual chlorine 0.20"}},{"id":"ccce8f14c5af6e7d","parameter":"Chlorine","value":"4 (as Cl 2 )","value_num":4,"unit":"mg/L","direction":"max","kind":"guideline","medium":"drinking_water","level":"national","parameter_key":"cas:7782-50-5","place":["US"],"conditions":["40 CFR 141.2: MRDLGs are nonenforceable health goals and do not reflect the benefit of the addition of the chemical for control of waterborne microbial contaminants."],"cite":{"instrument":"us_npdwr","title":"40 CFR Part 141 — National Primary Drinking Water Regulations (eCFR, as of 2026-08-01)","issuer":"U.S. Environmental Protection Agency (EPA)","edition":"eCFR as of 2026-08-01","source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-40.xml?part=141","source_sha256":"bd534eb2d8af38e141e1cd6236134a638298fbf14791b30279eeb47d815d7767","fetched_at":"2026-08-29","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"141.54, 141.65","page":null,"quote":null,"column":"mrdlg"}},{"id":"221f54cd4837796e","parameter":"Chlorine","value":"4.0 (as Cl 2 )","value_num":4,"unit":"mg/L","direction":"max","kind":"limit","medium":"drinking_water","level":"national","parameter_key":"cas:7782-50-5","place":["US"],"conditions":["40 CFR 141.2: Maximum residual disinfectant level (MRDL) means a level of a disinfectant added for water treatment that may not be exceeded at the consumer's tap without an unacceptable possibility of adverse health effects."],"cite":{"instrument":"us_npdwr","title":"40 CFR Part 141 — National Primary Drinking Water Regulations (eCFR, as of 2026-08-01)","issuer":"U.S. Environmental Protection Agency (EPA)","edition":"eCFR as of 2026-08-01","source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-40.xml?part=141","source_sha256":"bd534eb2d8af38e141e1cd6236134a638298fbf14791b30279eeb47d815d7767","fetched_at":"2026-08-29","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"141.54, 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