{"permit":"SD0020796","name":"Lead - Deadwood Sanitary District","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/SD0020796"},"about":[{"label":"What it is","text":"Sewage treatment plant · rated a major discharger by EPA"},{"label":"Where","text":"Deadwood, South Dakota","href":"https://www.openstreetmap.org/?mlat=44.3866800&mlon=-103.711044#map=14/44.3866800/-103.711044"},{"label":"Last 12 months","text":"No values over a limit"},{"label":"Permit","text":"Expired Jun 30, 2020; 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":"2020-01-02","price":"free while piloted","order_page":"https://passage-data.com/dmr/p/SD0020796#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":"2026-08-31","over":0,"over_by":[],"window":["2025-10-01","2026-09-30"]},"over_limits":[],"limits":[{"outfall":"001","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":"Any Discharge from Lead-Deadwood Sanitary Districts' WWTF to Whitewood Creek."},{"outfall":"001","parameter":"Temperature, water deg. centigrade","parameter_code":"00010","statistic":"daily maximum","qualifier":"<=","value":"24","unit":"deg C","report_only":false,"enforceable":true,"months":"all","limit_set":"Any Discharge from Lead-Deadwood Sanitary Districts' WWTF to Whitewood Creek."},{"outfall":"001","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":"Any Discharge from Lead-Deadwood Sanitary Districts' WWTF to Whitewood Creek."},{"outfall":"001","parameter":"Flow rate","parameter_code":"00056","statistic":"daily maximum","qualifier":null,"value":null,"unit":"MGD","report_only":true,"enforceable":true,"months":"all","limit_set":"Any Discharge from Lead-Deadwood Sanitary Districts' WWTF to Whitewood Creek."},{"outfall":"001","parameter":"Conductivity","parameter_code":"00094","statistic":"30-day average","qualifier":"<=","value":"3651","unit":"umho/cm","report_only":false,"enforceable":true,"months":"all","limit_set":"Any Discharge from Lead-Deadwood Sanitary Districts' WWTF to Whitewood Creek."},{"outfall":"001","parameter":"Conductivity","parameter_code":"00094","statistic":"daily maximum","qualifier":"<=","value":"4375","unit":"umho/cm","report_only":false,"enforceable":true,"months":"all","limit_set":"Any Discharge from Lead-Deadwood Sanitary Districts' WWTF to Whitewood Creek."},{"outfall":"001","parameter":"Oxygen, dissolved [DO]","parameter_code":"00300","statistic":"daily minimum","qualifier":">=","value":"5","unit":"mg/L","report_only":false,"enforceable":true,"months":"all","limit_set":"Any Discharge from Lead-Deadwood Sanitary Districts' WWTF to Whitewood Creek."},{"outfall":"001","parameter":"BOD, 5-day, 20 deg. 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maximum","qualifier":null,"value":null,"unit":"mg/L","report_only":true,"enforceable":true,"months":"all","limit_set":"Any Discharge from Lead-Deadwood Sanitary Districts' WWTF to Whitewood Creek."},{"outfall":"001","parameter":"BOD, 5-day, percent removal","parameter_code":"81010","statistic":"monthly average minimum","qualifier":">=","value":"85","unit":"%","report_only":false,"enforceable":true,"months":"all","limit_set":"Any Discharge from Lead-Deadwood Sanitary Districts' WWTF to Whitewood Creek."},{"outfall":"001","parameter":"Solids, suspended percent removal","parameter_code":"81011","statistic":"monthly average minimum","qualifier":">=","value":"85","unit":"%","report_only":false,"enforceable":true,"months":"all","limit_set":"Any Discharge from Lead-Deadwood Sanitary Districts' WWTF to Whitewood Creek."},{"outfall":"001","parameter":"Oil and grease visual","parameter_code":"84066","statistic":"daily maximum","qualifier":"<=","value":"0","unit":"abst=0;prst=1","report_only":false,"enforceable":true,"months":"all","limit_set":"Any Discharge from Lead-Deadwood Sanitary Districts' WWTF to Whitewood Creek."},{"outfall":"001","parameter":"Report due [yrmoda]","parameter_code":"85539","statistic":"value","qualifier":"<=","value":"0","unit":"Y=0;N=1","report_only":false,"enforceable":true,"months":"all","limit_set":"Influent (Metals and Other Toxics)"},{"outfall":"001","parameter":"Report due [yrmoda]","parameter_code":"85539","statistic":"value","qualifier":"<=","value":"0","unit":"Y=0;N=1","report_only":false,"enforceable":true,"months":"all","limit_set":"Effluent (Metals and Other Toxics)"},{"outfall":"003","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":"Discharge from the CSO owned by Lead-Deadwood Sanitary District to 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