{"query":{"parameter":"total nitrogen","place":"US-MT","medium":null,"statistic":null,"kind":null},"searched":{"places":["US-MT","US"],"parameter_keys":["cas:7727-37-9","name:azoto totale","name:total nitrogen","cas:7664-41-7","cas:14797-55-8","name:total inorganic nitrogen","name:total nitrate and nitrite","name:total soluble inorganic nitrogen"],"names_matched":[["total nitrogen","cas:7727-37-9"],["total nitrogen","name:azoto totale"],["total nitrogen","name:total nitrogen"],["ammonia total ammonia nitrogen","cas:7664-41-7"],["ammonia total ammonia nitrogen in mg n l","cas:7664-41-7"],["ammonia total ammonia nitrogen nh3 n plus nh4 n as ug l n","cas:7664-41-7"],["nitrate nitrogen as total nitrogen","cas:14797-55-8"],["total ammonia nitrogen","cas:7664-41-7"],["total ammonia nitrogen tan","cas:7664-41-7"],["total inorganic nitrogen","name:total inorganic nitrogen"],["total inorganic nitrogen as n","name:total inorganic nitrogen"],["total inorganic nitrogen n inorg","name:total inorganic nitrogen"],["total nitrate and nitrite as nitrogen","name:total nitrate and nitrite"],["total soluble inorganic nitrogen","name:total soluble inorganic nitrogen"]],"match":"exact+contains","order":"The place's own instruments first, then each place above it, each in its register's order","not_sent":{"rows":1771,"names":["Ammonia (as N)","Ammonia","Ammonia-N","Ammonia as N","Nitrate (as N)","Nitrate (measured as nitrogen)","Ammonia as Nitrogen","Nitrate"],"says":"1771 rows share a parameter key with a longer name holding \"total nitrogen\" 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":29,"offset":0,"returned":29,"next_offset":null,"rows":[{"id":"784e48e119edaf5b","parameter":"Ammonia [total ammonia nitrogen (NH3-N plus NH4-N)] as ug/L N","value":"(7)(8) NPP","unit":"µg/L","statistic":"hourly_avg","direction":"max","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"cas:7664-41-7","place":["US-MT"],"conditions":["receiving_water is freshwater","Montana surface waters (aquatic life standards; DEQ-7 applies to the waters ARM 17.30.620-670 classify)","pH- and temperature-dependent (total ammonia nitrogen): footnote (7)'s equations and tables, by whether salmonids and fish early life stages are present; not evaluated"],"cite":{"instrument":"us_mt_wqs","title":"Montana Circular DEQ-7 Numeric Water Quality Standards: aquatic life acute and chronic and human health surface water standards; footnote (15) dissolved oxygen","issuer":"State of Montana, Department of Environmental Quality (Water 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equations and tables, by whether salmonids and fish early life stages are present; not evaluated"],"cite":{"instrument":"us_mt_wqs","title":"Montana Circular DEQ-7 Numeric Water Quality Standards: aquatic life acute and chronic and human health surface water standards; footnote (15) dissolved oxygen","issuer":"State of Montana, Department of Environmental Quality (Water Quality Division)","edition":"Circular DEQ-7, June 2019, as US EPA posts it in effect for CWA purposes (cover April 7, 2020; last EPA action April 23, 2018)","source_url":"https://www.epa.gov/sites/default/files/2014-12/documents/mt-deq7.pdf","source_sha256":"beda1c7ee072086eaa2da108a4d3432ea613a1f7477fd3e008755c4834ff6dd8","fetched_at":"2026-10-14","source_status":{"checked":"2026-10-15","status":"unchanged"},"section":"Circular DEQ-7 (June 2019)","page":13,"quote":null}},{"id":"86b64c0311dbfa1a","parameter":"Total 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Nitrogen","value":"134","value_num":134,"unit":"mg/L","statistic":"monthly_avg","direction":"max","kind":"limit","medium":"water_discharge","level":"national","route":"direct","parameter_key":"cas:7727-37-9","place":["US"],"conditions":["route is direct","cites is 40 CFR 432","the discharge is of the Subpart A—Simple Slaughterhouses","existing sources (BAT)","table: Effluent Limitations [BAT]"],"cite":{"instrument":"us_40cfr432","title":"40 CFR Part 432 — PART 432—MEAT AND POULTRY PRODUCTS 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=432","source_sha256":"3b1a8b869cb040029bdcb18f0ff232995cfc9774f16112f5700bb1f5cb31daa4","fetched_at":"2026-10-09","source_status":{"checked":"2026-10-15","status":"unchanged"},"section":"40 CFR 432.13 (BAT)","page":null,"quote":"Total Nitrogen 194 134"}},{"id":"c89a522fa2c30539","parameter":"Total 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specified in § 432.12(a)(1) and the standards for ammonia (as N) and total nitrogen are as follows:","table: Performance Standards [NSPS]"],"cite":{"instrument":"us_40cfr432","title":"40 CFR Part 432 — PART 432—MEAT AND POULTRY PRODUCTS 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=432","source_sha256":"3b1a8b869cb040029bdcb18f0ff232995cfc9774f16112f5700bb1f5cb31daa4","fetched_at":"2026-10-09","source_status":{"checked":"2026-10-15","status":"unchanged"},"section":"40 CFR 432.15 (NSPS)","page":null,"quote":"Total Nitrogen 194 134"}},{"id":"9c96df1e3f7b9450","parameter":"Total Nitrogen","value":"194","value_num":194,"unit":"mg/L","statistic":"daily_max","direction":"max","kind":"limit","medium":"water_discharge","level":"national","route":"direct","parameter_key":"cas:7727-37-9","place":["US"],"conditions":["route is direct","cites is 40 CFR 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[BAT]"],"cite":{"instrument":"us_40cfr432","title":"40 CFR Part 432 — PART 432—MEAT AND POULTRY PRODUCTS 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=432","source_sha256":"3b1a8b869cb040029bdcb18f0ff232995cfc9774f16112f5700bb1f5cb31daa4","fetched_at":"2026-10-09","source_status":{"checked":"2026-10-15","status":"unchanged"},"section":"40 CFR 432.103 (BAT)","page":null,"quote":"Total Nitrogen 2 194 134"}},{"id":"ec2617c5eec39759","parameter":"Total Nitrogen","value":"194","value_num":194,"statistic":"daily_max","direction":"max","kind":"limit","medium":"water_discharge","level":"national","route":"direct","parameter_key":"cas:7727-37-9","place":["US"],"conditions":["route is direct","cites is 40 CFR 432","the discharge is of the Subpart J—Renderers","new sources (NSPS)","table: Performance Standards 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