{"permit":"MD0021687","name":"UPPER POTOMAC RIVER COMMISSION","state":"MD","as_of":"2026-10-22","source":{"publisher":"U.S. EPA — ECHO / ICIS-NPDES national file","as_of":"2026-10-22","page":"/dmr/p/MD0021687"},"about":[{"label":"What it is","text":"Sewerage Systems (EPA's industry listing) · rated a major discharger by EPA"},{"label":"Where","text":"Westernport, Maryland","href":"https://www.openstreetmap.org/?mlat=39.480092&mlon=-79.04142#map=14/39.480092/-79.04142"},{"label":"Last 12 months","text":"Over a limit 8 times, last in July 2026 (Nitrogen, total [as N]). 16 of 44 reports filed late"},{"label":"Permit","text":"Expired Aug 31, 2019; 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":"2019-03-04","price":"free while piloted","order_page":"https://passage-data.com/dmr/p/MD0021687#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":{"state":"MD","sic":"4952","permits":163,"list":"https://passage-data.com/api/v1/permits?state=MD&sic=4952"},"limits_from_version":null,"record":{"last_filed":"2026-08-31","over":8,"over_by":[["Nitrogen, total [as N]",8]],"window":["2025-10-01","2026-09-30"]},"over_limits":[{"parameter":"Nitrogen, total [as N]","times":8,"find_limits":{"parameter":"total nitrogen","place":"US-MD","medium":"water_discharge"},"get":"https://passage-data.com/api/v1/limits?parameter=total+nitrogen&place=US-MD&medium=water_discharge"}],"limits":[{"outfall":"001","parameter":"Temperature, water deg. fahrenheit","parameter_code":"00011","statistic":"daily maximum","qualifier":"<=","value":"100","unit":"deg F","report_only":false,"enforceable":true,"months":"all","limit_set":"IND AND MUN WASTEWATER"},{"outfall":"001","parameter":"Turbidity","parameter_code":"00070","statistic":"maximum monthly average","qualifier":"<=","value":"150","unit":"NTU","report_only":false,"enforceable":true,"months":"all","limit_set":"IND AND MUN WASTEWATER"},{"outfall":"001","parameter":"Turbidity","parameter_code":"00070","statistic":"daily maximum","qualifier":"<=","value":"300","unit":"NTU","report_only":false,"enforceable":true,"months":"all","limit_set":"IND AND MUN WASTEWATER"},{"outfall":"001","parameter":"Color [PT-CO units]","parameter_code":"00080","statistic":"monthly average","qualifier":null,"value":null,"unit":"col unit (pc)","report_only":true,"enforceable":true,"months":"all","limit_set":"IND AND MUN WASTEWATER"},{"outfall":"001","parameter":"Color [PT-CO units]","parameter_code":"00080","statistic":"daily maximum","qualifier":null,"value":null,"unit":"col unit (pc)","report_only":true,"enforceable":true,"months":"all","limit_set":"IND AND MUN WASTEWATER"},{"outfall":"001","parameter":"Color","parameter_code":"00084","statistic":"maximum monthly average","qualifier":"<=","value":"75060","unit":"lb/d","report_only":false,"enforceable":true,"months":"all","limit_set":"IND AND MUN WASTEWATER"},{"outfall":"001","parameter":"Color","parameter_code":"00084","statistic":"daily maximum","qualifier":"<=","value":"138860","unit":"lb/d","report_only":false,"enforceable":true,"months":"all","limit_set":"IND AND MUN WASTEWATER"},{"outfall":"001","parameter":"Oxygen, dissolved [DO]","parameter_code":"00300","statistic":"minimum","qualifier":">=","value":"5","unit":"mg/L","report_only":false,"enforceable":true,"months":"all","limit_set":"IND AND MUN WASTEWATER"},{"outfall":"001","parameter":"BOD, 5-day, 20 deg. 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fetch.","arguments":{"state":"MD","sic":"4952"},"needs":{},"get":"https://passage-data.com/api/v1/permits?state=MD&sic=4952","url":"https://passage-data.com/api/v1/permits?state=MD&sic=4952"},{"tool":"find_limits","says":"What do the rules say about what it went over on? find_limits gives the cited state and federal limits for it, each with its rule; `get` is the address to fetch, and `over_limits` holds one for each parameter.","arguments":{"parameter":"total nitrogen","place":"US-MD","medium":"water_discharge"},"needs":{},"get":"https://passage-data.com/api/v1/limits?parameter=total+nitrogen&place=US-MD&medium=water_discharge","url":"https://passage-data.com/api/v1/limits?parameter=total+nitrogen&place=US-MD&medium=water_discharge","page":"https://passage-data.com/limits/US-MD/total-nitrogen"},{"tool":"check_dmr","says":"Before your user files this 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":"MD0021687"},"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=MD0021687"},{"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":"MD0021687"},"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=MD0021687"}]}