{"query":{"parameter":"tds","place":"US-PA","medium":null,"statistic":null,"kind":null},"searched":{"places":["US-PA","US"],"parameter_keys":["name:tds","name:total dissolved solids"],"names_matched":[["tds","name:tds"],["tds","name:total dissolved solids"]],"match":"exact","order":"The place's own instruments first, then each place above it, each in its register's order"},"total":19,"offset":0,"returned":19,"next_offset":null,"rows":[{"id":"9876a9fb767ce1b8","parameter":"Total Dissolved Solids","value":"2,000 mg/L","value_num":2000,"unit":"mg/L","statistic":"monthly_avg","direction":"max","kind":"limit","medium":"water_discharge","level":"regional","route":"direct","parameter_key":"name:total dissolved solids","place":["US-PA"],"conditions":["route is direct","a new or expanding mass loading of TDS (any net increase authorized after August 21, 2010), not exempt under §95.10(a) — among the exemptions: a load of 5,000 pounds per day or less as an annual average daily load (a)(7), and a subcategory with a federal BAT, BCT or new-source limit for TDS, chlorides or sulfates (a)(8) — nor gas-well wastewater under (b)"],"cite":{"instrument":"us_pa_95_10","title":"25 Pa. Code §95.10 — Treatment requirements for new and expanding mass loadings of Total Dissolved Solids (TDS)","issuer":"Commonwealth of Pennsylvania, Environmental Quality Board (Department of Environmental Protection)","edition":"Pennsylvania Code as served 2026-10-09: §95.10 adopted August 20, 2010, effective August 21, 2010, 40 Pa.B. 4835","source_url":"https://www.pacodeandbulletin.gov/Display/pacode?file=/secure/pacode/data/025/chapter95/s95.10.html","source_sha256":"3efe28fe5fdf25026065dc5c8eda59ff926fd8783ef959b26b5366dd5ef24c20","fetched_at":"2026-10-09","source_status":{"checked":"2026-10-15","status":"unchanged"},"section":"25 Pa. Code §95.10(c)","page":null,"quote":"(c) New and expanding mass loadings of TDS not addressed in subsections (a) and (b) may not contain more than 2,000 mg/L of TDS as a monthly average, unless a variance is approved by the Department under this section."}},{"id":"2e8f29c762d78e78","parameter":"Total Dissolved Solids","value":"500 mg/L","value_num":500,"unit":"mg/L","statistic":"monthly_avg","direction":"max","kind":"limit","medium":"water_discharge","level":"regional","route":"direct","parameter_key":"name:total dissolved solids","place":["US-PA"],"conditions":["route is direct","treated wastewater from fracturing, production, field exploration, drilling or completion of natural gas wells, discharged from a centralized waste treatment facility (§95.10(b)(3)(i))"],"cite":{"instrument":"us_pa_95_10","title":"25 Pa. Code §95.10 — Treatment requirements for new and expanding mass loadings of Total Dissolved Solids (TDS)","issuer":"Commonwealth of Pennsylvania, Environmental Quality Board (Department of Environmental Protection)","edition":"Pennsylvania Code as served 2026-10-09: §95.10 adopted August 20, 2010, effective August 21, 2010, 40 Pa.B. 4835","source_url":"https://www.pacodeandbulletin.gov/Display/pacode?file=/secure/pacode/data/025/chapter95/s95.10.html","source_sha256":"3efe28fe5fdf25026065dc5c8eda59ff926fd8783ef959b26b5366dd5ef24c20","fetched_at":"2026-10-09","source_status":{"checked":"2026-10-15","status":"unchanged"},"section":"25 Pa. Code §95.10(b)(3)","page":null,"quote":"(iii) The discharge may not contain more than 500 mg/L of TDS as a monthly average."}},{"id":"0e0c2774d61e3c81","parameter":"Total Dissolved Solids","value":"500 mg/l as a monthly average value; maximum 750 mg/l.","value_num":500,"unit":"mg/L","statistic":"monthly_avg","direction":"max","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"name:total dissolved solids","place":["US-PA"],"conditions":["critical use PWS (potable water supply): 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":"unchanged"},"section":"25 Pa. Code §93.7 Table 3 (TDS)","page":null,"quote":"Total Dissolved Solids TDS 500 mg/l as a monthly average value; maximum 750 mg/l. PWS"}},{"id":"39f1b0679407a506","parameter":"Total Dissolved Solids","value":"500 mg/l as a monthly average value; maximum 750 mg/l.","value_num":750,"unit":"mg/L","direction":"max","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"name:total dissolved solids","place":["US-PA"],"conditions":["critical use PWS (potable water supply): 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":"unchanged"},"section":"25 Pa. Code §93.7 Table 3 (TDS)","page":null,"quote":"Total Dissolved Solids TDS 500 mg/l as a monthly average value; maximum 750 mg/l. PWS"}},{"id":"7fcbc703e544b3d7","parameter":"TDS","value":"306","value_num":306,"unit":"mg/L","statistic":"daily_max","direction":"max","kind":"limit","medium":"water_discharge","level":"national","route":"direct","parameter_key":"name:tds","place":["US"],"conditions":["route is direct","cites is 40 CFR 423","existing sources (BAT)","(3) Voluntary incentives plan. (i) For dischargers who voluntarily choose to meet the effluent limitations for FGD wastewater in this paragraph (g)(3)(i), the quantity of pollutants in FGD wastewater shall not exceed the quantity determined by multiplying the flow of FGD wastewater times the concentration listed in table 7 to this paragraph (g)(3)(i). Dischargers who choose to meet the effluent…","table: Table 7 to Paragraph ( g )(3)( i )"],"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":"unchanged"},"section":"40 CFR 423.13 (BAT)","page":null,"quote":"TDS (mg/L) 306 149"}},{"id":"0847ec7b9bcedc86","parameter":"TDS","value":"149","value_num":149,"unit":"mg/L","statistic":"monthly_avg","direction":"max","kind":"limit","medium":"water_discharge","level":"national","route":"direct","parameter_key":"name:tds","place":["US"],"conditions":["route is direct","cites is 40 CFR 423","existing sources (BAT)","(3) Voluntary incentives plan. (i) For dischargers who voluntarily choose to meet the effluent limitations for FGD wastewater in this paragraph (g)(3)(i), the quantity of pollutants in FGD wastewater shall not exceed the quantity determined by multiplying the flow of FGD wastewater times the concentration listed in table 7 to this paragraph (g)(3)(i). Dischargers who choose to meet the effluent…","table: Table 7 to Paragraph ( g )(3)( i )"],"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":"unchanged"},"section":"40 CFR 423.13 (BAT)","page":null,"quote":"TDS (mg/L) 306 149"}},{"id":"1d4d5c4590b179b7","parameter":"TDS","value":"50","value_num":50,"unit":"mg/L","statistic":"daily_max","direction":"max","kind":"limit","medium":"water_discharge","level":"national","route":"direct","parameter_key":"name:tds","place":["US"],"conditions":["route is direct","cites is 40 CFR 423","new sources (NSPS)","(13) FGD wastewater. The quantity of pollutants discharged in FGD wastewater shall not exceed the quantity determined by multiplying the flow of FGD wastewater 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":"unchanged"},"section":"40 CFR 423.15 (NSPS)","page":null,"quote":"TDS (mg/L) 50 24"}},{"id":"9947e7acf5baa2bb","parameter":"TDS","value":"24","value_num":24,"unit":"mg/L","statistic":"monthly_avg","direction":"max","kind":"limit","medium":"water_discharge","level":"national","route":"direct","parameter_key":"name:tds","place":["US"],"conditions":["route is direct","cites is 40 CFR 423","new sources (NSPS)","(13) FGD wastewater. The quantity of pollutants discharged in FGD wastewater shall not exceed the quantity determined by multiplying the flow of FGD wastewater 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":"unchanged"},"section":"40 CFR 423.15 (NSPS)","page":null,"quote":"TDS (mg/L) 50 24"}},{"id":"f52e728b40e5a558","parameter":"TDS","value":"50","value_num":50,"unit":"mg/L","statistic":"daily_max","direction":"max","kind":"limit","medium":"water_discharge","level":"national","route":"sewer","parameter_key":"name:tds","place":["US"],"conditions":["route is sewer","cites is 40 CFR 423","new sources (PSNS)","(6) FGD wastewater. The quantity of pollutants discharged in FGD wastewater shall not exceed the quantity determined by multiplying the flow of FGD wastewater 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":"unchanged"},"section":"40 CFR 423.17 (PSNS)","page":null,"quote":"TDS (mg/L) 50 24"}},{"id":"81512f5088f616a6","parameter":"TDS","value":"24","value_num":24,"unit":"mg/L","statistic":"monthly_avg","direction":"max","kind":"limit","medium":"water_discharge","level":"national","route":"sewer","parameter_key":"name:tds","place":["US"],"conditions":["route is sewer","cites is 40 CFR 423","new sources (PSNS)","(6) FGD wastewater. The quantity of pollutants discharged in FGD wastewater shall not exceed the quantity determined by multiplying the flow of FGD wastewater 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":"unchanged"},"section":"40 CFR 423.17 (PSNS)","page":null,"quote":"TDS (mg/L) 50 24"}},{"id":"a0a4aa5a390d294a","parameter":"Total dissolved solids","value":"38","value_num":38,"unit":"mg/L","statistic":"daily_max","direction":"max","kind":"limit","medium":"water_discharge","level":"national","route":"direct","parameter_key":"name:total dissolved solids","place":["US"],"conditions":["route is direct","cites is 40 CFR 423","existing sources (BAT)","(j)(1)(i) Gasification wastewater. Except for those discharges to which paragraph (j)(2) of this section applies, the quantity of pollutants in gasification wastewater shall not exceed the quantity determined by multiplying the flow of gasification wastewater times the concentration listed in the table following this paragraph (j)(1)(i). Dischargers must meet the effluent limitations in this pa…"],"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":"unchanged"},"section":"40 CFR 423.13 (BAT)","page":null,"quote":"Total dissolved solids (mg/L) 38 22"}},{"id":"6a7ce9955ba7d21f","parameter":"Total dissolved solids","value":"22","value_num":22,"unit":"mg/L","statistic":"monthly_avg","direction":"max","kind":"limit","medium":"water_discharge","level":"national","route":"direct","parameter_key":"name:total dissolved solids","place":["US"],"conditions":["route is direct","cites is 40 CFR 423","existing sources (BAT)","(j)(1)(i) Gasification wastewater. Except for those discharges to which paragraph (j)(2) of this section applies, the quantity of pollutants in gasification wastewater shall not exceed the quantity determined by multiplying the flow of gasification wastewater times the concentration listed in the table following this paragraph (j)(1)(i). Dischargers must meet the effluent limitations in this pa…"],"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":"unchanged"},"section":"40 CFR 423.13 (BAT)","page":null,"quote":"Total dissolved solids (mg/L) 38 22"}},{"id":"5f54419111d43303","parameter":"Total dissolved solids","value":"38","value_num":38,"unit":"mg/L","statistic":"daily_max","direction":"max","kind":"limit","medium":"water_discharge","level":"national","route":"direct","parameter_key":"name:total dissolved solids","place":["US"],"conditions":["route is direct","cites is 40 CFR 423","new sources (NSPS)","(15) Gasification wastewater. The quantity of pollutants discharged in gasification wastewater shall not exceed the quantity determined by multiplying the flow of gasification wastewater 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":"unchanged"},"section":"40 CFR 423.15 (NSPS)","page":null,"quote":"Total dissolved solids (mg/L) 38 22"}},{"id":"741ded8be58fd821","parameter":"Total dissolved solids","value":"22","value_num":22,"unit":"mg/L","statistic":"monthly_avg","direction":"max","kind":"limit","medium":"water_discharge","level":"national","route":"direct","parameter_key":"name:total dissolved solids","place":["US"],"conditions":["route is direct","cites is 40 CFR 423","new sources (NSPS)","(15) Gasification wastewater. The quantity of pollutants discharged in gasification wastewater shall not exceed the quantity determined by multiplying the flow of gasification wastewater 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":"unchanged"},"section":"40 CFR 423.15 (NSPS)","page":null,"quote":"Total dissolved solids (mg/L) 38 22"}},{"id":"32291ca65c23db2a","parameter":"Total dissolved solids","value":"38","value_num":38,"unit":"mg/L","statistic":"daily_max","direction":"max","kind":"limit","medium":"water_discharge","level":"national","route":"sewer","parameter_key":"name:total dissolved solids","place":["US"],"conditions":["route is sewer","cites is 40 CFR 423","existing sources (PSES)","(i) Gasification wastewater. For any electric generating unit with a total nameplate generating capacity of more than 50 megawatts and that is not an oil-fired unit, the quantity of pollutants in gasification wastewater shall not exceed the quantity determined by multiplying the flow of gasification wastewater times the concentration listed in the table following this paragraph (i). Dischargers…"],"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":"unchanged"},"section":"40 CFR 423.16 (PSES)","page":null,"quote":"Total dissolved solids (mg/L) 38 22"}},{"id":"6d1466c807c1fbfa","parameter":"Total dissolved solids","value":"22","value_num":22,"unit":"mg/L","statistic":"monthly_avg","direction":"max","kind":"limit","medium":"water_discharge","level":"national","route":"sewer","parameter_key":"name:total dissolved solids","place":["US"],"conditions":["route is sewer","cites is 40 CFR 423","existing sources (PSES)","(i) Gasification wastewater. For any electric generating unit with a total nameplate generating capacity of more than 50 megawatts and that is not an oil-fired unit, the quantity of pollutants in gasification wastewater shall not exceed the quantity determined by multiplying the flow of gasification wastewater times the concentration listed in the table following this paragraph (i). Dischargers…"],"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":"unchanged"},"section":"40 CFR 423.16 (PSES)","page":null,"quote":"Total dissolved solids (mg/L) 38 22"}},{"id":"0c7335b1db7189d8","parameter":"Total dissolved solids","value":"38","value_num":38,"unit":"mg/L","statistic":"daily_max","direction":"max","kind":"limit","medium":"water_discharge","level":"national","route":"sewer","parameter_key":"name:total dissolved solids","place":["US"],"conditions":["route is sewer","cites is 40 CFR 423","new sources (PSNS)","(9) Gasification wastewater. The quantity of pollutants discharged in gasification wastewater shall not exceed the quantity determined by multiplying the flow of gasification wastewater 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":"unchanged"},"section":"40 CFR 423.17 (PSNS)","page":null,"quote":"Total dissolved solids (mg/L) 38 22"}},{"id":"283f2e4073891ddd","parameter":"Total dissolved solids","value":"22","value_num":22,"unit":"mg/L","statistic":"monthly_avg","direction":"max","kind":"limit","medium":"water_discharge","level":"national","route":"sewer","parameter_key":"name:total dissolved solids","place":["US"],"conditions":["route is sewer","cites is 40 CFR 423","new sources (PSNS)","(9) Gasification wastewater. The quantity of pollutants discharged in gasification wastewater shall not exceed the quantity determined by multiplying the flow of gasification wastewater 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":"unchanged"},"section":"40 CFR 423.17 (PSNS)","page":null,"quote":"Total dissolved solids (mg/L) 38 22"}},{"id":"97602088892d6b04","parameter":"Total dissolved solids (TDS)","value":"500 mg/l","value_num":500,"direction":"max","kind":"guideline","medium":"drinking_water","level":"national","parameter_key":"name:total dissolved solids","place":["US"],"conditions":["40 CFR 143.1: The regulations in this subpart are not Federally enforceable but are intended as guidelines for the States."],"cite":{"instrument":"us_nsdwr","title":"40 CFR Part 143 — National Secondary 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=143","source_sha256":"a98e8b66948f546c71e119055eff012e6380857a255ec216a4247b658bcf040d","fetched_at":"2026-08-29","source_status":{"checked":"2026-10-15","status":"unchanged"},"section":"143.3","page":null,"quote":null,"column":"smcl"}}],"next":[{"tool":"check_values","says":"Has your user measured this? check_values sets each of their results beside every row held here, with a verdict and the row's cite.","arguments":{"place":"US-PA"},"needs":{"rows":"Your user's measured results, as their table prints them: [{parameter: \"tds\", value, unit}, ...], any other parameters too."},"post":"/api/v1/check"},{"tool":"read_certificate","says":"Has your user a laboratory certificate? read_certificate reads every row it prints, each with its page, and checks them against these limits.","arguments":{"place":"US-PA"},"needs":{"content_base64":"The laboratory's certificate (PDF) or its XLSX, XLS or CSV export, as base64; or file_url, a public https address of it."},"post":"/api/v1/certificate"}]}