{"permit":"SC0020443","name":"ROCK HILL CITY OF","state":"SC","as_of":"2026-10-22","source":{"publisher":"U.S. EPA — ECHO / ICIS-NPDES national file","as_of":"2026-10-22","page":"/dmr/p/SC0020443"},"about":[{"label":"What it is","text":"Sewage treatment plant · rated a major discharger by EPA"},{"label":"Where","text":"Rock Hill, South Carolina","href":"https://www.openstreetmap.org/?mlat=34.9558317&mlon=-80.957504#map=14/34.9558317/-80.957504"},{"label":"Last 12 months","text":"Over a limit once, last in July 2026 (pH)"},{"label":"Permit","text":"In force until Apr 30, 2028"}],"renewal_due":null,"renewal_check":{"offered_because":"application_due_within_18_months","application_due":"2027-11-02","price":"free while piloted","order_page":"https://passage-data.com/dmr/p/SC0020443#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":[["pH",1]],"window":["2025-10-01","2026-09-30"]},"over_limits":[{"parameter":"pH","times":1,"find_limits":{"parameter":"ph","place":"US-SC","medium":"surface_water"},"get":"https://passage-data.com/api/v1/limits?parameter=ph&place=US-SC&medium=surface_water"}],"upcoming":[{"parameter":"Peracetic Acid","outfall":"001","limit":1,"unit":"mg/L","statistic":"daily maximum","statistic_code":"DD","begin":"2028-03-01","kind":"new","now":null},{"parameter":"Peracetic Acid","outfall":"001","limit":167,"unit":"lb/d","statistic":"daily maximum","statistic_code":"DD","begin":"2028-03-01","kind":"new","now":null}],"limits":[{"outfall":"001","parameter":"Oxygen demand, ultimate","parameter_code":"00181","statistic":"monthly average","qualifier":"<=","value":"15471","unit":"lb/d","report_only":false,"enforceable":true,"months":"all","limit_set":"0011"},{"outfall":"001","parameter":"Oxygen demand, ultimate","parameter_code":"00181","statistic":"weekly average","qualifier":null,"value":null,"unit":"lb/d","report_only":true,"enforceable":true,"months":"all","limit_set":"0011"},{"outfall":"001","parameter":"Oxygen, dissolved [DO]","parameter_code":"00300","statistic":"minimum","qualifier":">=","value":"6","unit":"mg/L","report_only":false,"enforceable":true,"months":"all","limit_set":"0011"},{"outfall":"001","parameter":"BOD, 5-day, 20 deg. 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permit's DMR: check_dmr sets each value beside the permit's limit for that period, with EPA's violation rule's verdict.","arguments":{"permit":"SC0020443"},"needs":{"period_end":"The reporting period: its month (2026-09).","values":"The period's values as your user will file them: [{outfall, parameter, statistic, value, unit}, ...]."},"post":"/api/v1/dmr/check","url":"https://passage-data.com/api/v1/dmr/check","page":"https://passage-data.com/dmr/?permit=SC0020443"},{"tool":"fill_dmr","says":"Has your user the plant's raw daily results? fill_dmr computes the period's DMR values from them, each with the rows it came from.","arguments":{"permit":"SC0020443"},"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=SC0020443"}]}