{"permit":"SD0023370","name":"Watertown, City of","state":"SD","as_of":"2026-10-22","source":{"publisher":"U.S. EPA — ECHO / ICIS-NPDES national file","as_of":"2026-10-22","page":"/dmr/p/SD0023370"},"about":[{"label":"What it is","text":"Sewage treatment plant · rated a major discharger by EPA"},{"label":"Where","text":"Watertown, South Dakota","href":"https://www.openstreetmap.org/?mlat=44.8850280&mlon=-97.099250#map=14/44.8850280/-97.099250"},{"label":"Last 12 months","text":"Over a limit once, last in March 2026 (Nitrogen, ammonia total [as N])"},{"label":"Permit","text":"Expired Jun 30, 2009; its limits still apply until a new permit is issued, and EPA still expects the reports"}],"renewal_due":null,"renewal_check":{"offered_because":"permit_expired","application_due":"2009-01-01","price":"free while piloted","order_page":"https://passage-data.com/dmr/p/SD0023370#renewal","says":"Each limit a renewal could tighten or add, from the state's water-quality standards and the federal rules for this kind of discharge, each cited to its rule, beside EPA's 12-month record; a rule we do not hold is named, never guessed. A person orders it on the permit's page with their email; it is sent by email within 5 business days."},"sector":null,"limits_from_version":null,"record":{"last_filed":"2026-09-30","over":1,"over_by":[["Nitrogen, ammonia total [as N]",1]],"window":["2025-10-01","2026-09-30"]},"over_limits":[{"parameter":"Nitrogen, ammonia total [as N]","times":1,"find_limits":{"parameter":"ammonia","place":"US-SD","medium":"surface_water"},"get":"https://passage-data.com/api/v1/limits?parameter=ammonia&place=US-SD&medium=surface_water"}],"limits":[{"outfall":"002","parameter":"Temperature, water deg. centigrade","parameter_code":"00010","statistic":"30-day average","qualifier":null,"value":null,"unit":"deg C","report_only":true,"enforceable":true,"months":"all","limit_set":"POST AERATION CHAN/BIG SIOUX R"},{"outfall":"002","parameter":"Temperature, water deg. centigrade","parameter_code":"00010","statistic":"daily maximum","qualifier":null,"value":null,"unit":"deg C","report_only":true,"enforceable":true,"months":"all","limit_set":"POST AERATION CHAN/BIG SIOUX R"},{"outfall":"002","parameter":"Flow rate","parameter_code":"00056","statistic":"30-day average","qualifier":null,"value":null,"unit":"MGD","report_only":true,"enforceable":true,"months":"all","limit_set":"POST AERATION CHAN/BIG SIOUX R"},{"outfall":"002","parameter":"Flow rate","parameter_code":"00056","statistic":"daily maximum","qualifier":null,"value":null,"unit":"MGD","report_only":true,"enforceable":true,"months":"all","limit_set":"POST AERATION CHAN/BIG SIOUX R"},{"outfall":"002","parameter":"Conductivity","parameter_code":"00094","statistic":"30-day average","qualifier":null,"value":null,"unit":"umho/cm","report_only":true,"enforceable":true,"months":"all","limit_set":"POST AERATION CHAN/BIG SIOUX R"},{"outfall":"002","parameter":"Conductivity","parameter_code":"00094","statistic":"daily maximum","qualifier":null,"value":null,"unit":"umho/cm","report_only":true,"enforceable":true,"months":"all","limit_set":"POST AERATION CHAN/BIG SIOUX R"},{"outfall":"002","parameter":"Oxygen, dissolved [DO]","parameter_code":"00300","statistic":"daily minimum","qualifier":">=","value":"7","unit":"mg/L","report_only":false,"enforceable":true,"months":"all","limit_set":"POST AERATION CHAN/BIG SIOUX R"},{"outfall":"002","parameter":"BOD, 5-day, 20 deg. 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them, each with the rows it came from.","arguments":{"permit":"SD0023370"},"needs":{"period_end":"The reporting period: its month (2026-09).","rows":"The plant's results: [{date, parameter, value, unit, point}, ...]; or `table`, the lab's or plant's export as text."},"post":"/api/v1/dmr/fill","url":"https://passage-data.com/api/v1/dmr/fill","page":"https://passage-data.com/dmr/?permit=SD0023370"}]}