{"permit":"MD0022446","name":"HAMPSTEAD WWTP","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/MD0022446"},"about":[{"label":"What it is","text":"Sewage treatment plant"},{"label":"Where","text":"Hampstead, Maryland","href":"https://www.openstreetmap.org/?mlat=39.596135&mlon=-76.833488#map=14/39.596135/-76.833488"},{"label":"Last 12 months","text":"Over a limit 11 times, last in February 2026 (Nitrogen, ammonia total [as N]). 3 required values not reported. 4 of 56 reports filed late"},{"label":"Permit","text":"In force until Aug 31, 2030"}],"renewal_due":null,"renewal_check":null,"sector":null,"limits_from_version":null,"record":{"last_filed":"2026-08-31","over":11,"over_by":[["Nitrogen, ammonia total [as N]",11]],"window":["2025-10-01","2026-09-30"]},"over_limits":[{"parameter":"Nitrogen, ammonia total [as N]","times":11,"find_limits":{"parameter":"ammonia","place":"US-MD","medium":"surface_water"},"get":"https://passage-data.com/api/v1/limits?parameter=ammonia&place=US-MD&medium=surface_water"}],"limits":[{"outfall":"001","parameter":"Temperature, water deg. centigrade","parameter_code":"00010","statistic":"maximum","qualifier":null,"value":null,"unit":"deg C","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"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":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"BOD, 5-day, 20 deg. C","parameter_code":"00310","statistic":"maximum monthly average","qualifier":"<=","value":"20","unit":"mg/L","report_only":false,"enforceable":true,"months":["MAY","JUN","JUL","AUG","SEP"],"limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"BOD, 5-day, 20 deg. C","parameter_code":"00310","statistic":"maximum monthly average","qualifier":"<=","value":"30","unit":"mg/L","report_only":false,"enforceable":true,"months":["JAN","FEB","MAR","APR","OCT","NOV","DEC"],"limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"BOD, 5-day, 20 deg. C","parameter_code":"00310","statistic":"maximum weekly average","qualifier":"<=","value":"30","unit":"mg/L","report_only":false,"enforceable":true,"months":["MAY","JUN","JUL","AUG","SEP"],"limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"BOD, 5-day, 20 deg. C","parameter_code":"00310","statistic":"maximum weekly average","qualifier":"<=","value":"45","unit":"mg/L","report_only":false,"enforceable":true,"months":["JAN","FEB","MAR","APR","OCT","NOV","DEC"],"limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"BOD, 5-day, 20 deg. C","parameter_code":"00310","statistic":"maximum monthly average","qualifier":"<=","value":"100","unit":"lb/d","report_only":false,"enforceable":true,"months":["MAY","JUN","JUL","AUG","SEP"],"limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"BOD, 5-day, 20 deg. C","parameter_code":"00310","statistic":"maximum monthly average","qualifier":"<=","value":"150","unit":"lb/d","report_only":false,"enforceable":true,"months":["JAN","FEB","MAR","APR","OCT","NOV","DEC"],"limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"BOD, 5-day, 20 deg. C","parameter_code":"00310","statistic":"maximum weekly average","qualifier":"<=","value":"150","unit":"lb/d","report_only":false,"enforceable":true,"months":["MAY","JUN","JUL","AUG","SEP"],"limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"BOD, 5-day, 20 deg. C","parameter_code":"00310","statistic":"maximum weekly average","qualifier":"<=","value":"225","unit":"lb/d","report_only":false,"enforceable":true,"months":["JAN","FEB","MAR","APR","OCT","NOV","DEC"],"limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"pH","parameter_code":"00400","statistic":"minimum","qualifier":">=","value":"6.5","unit":"SU","report_only":false,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"pH","parameter_code":"00400","statistic":"maximum","qualifier":"<=","value":"8.5","unit":"SU","report_only":false,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Solids, total suspended","parameter_code":"00530","statistic":"maximum monthly average","qualifier":"<=","value":"30","unit":"mg/L","report_only":false,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Solids, total suspended","parameter_code":"00530","statistic":"maximum weekly average","qualifier":"<=","value":"45","unit":"mg/L","report_only":false,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Solids, total suspended","parameter_code":"00530","statistic":"maximum monthly average","qualifier":"<=","value":"150","unit":"lb/d","report_only":false,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Solids, total suspended","parameter_code":"00530","statistic":"annual maximum","qualifier":null,"value":null,"unit":"lb/yr","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Solids, total suspended","parameter_code":"00530","statistic":"monthly total","qualifier":null,"value":null,"unit":"lb/mo","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Solids, total suspended","parameter_code":"00530","statistic":"maximum weekly average","qualifier":"<=","value":"225","unit":"lb/d","report_only":false,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Nitrogen, total [as N]","parameter_code":"00600","statistic":"monthly average","qualifier":null,"value":null,"unit":"mg/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Nitrogen, total [as N]","parameter_code":"00600","statistic":"annual maximum","qualifier":null,"value":null,"unit":"lb/yr","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Nitrogen, total [as N]","parameter_code":"00600","statistic":"monthly total","qualifier":null,"value":null,"unit":"lb/mo","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Nitrogen, total [as N]","parameter_code":"00600","statistic":"annual total","qualifier":null,"value":null,"unit":"lb/yr","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594 Floating Caps"},{"outfall":"001","parameter":"Nitrogen, total [as N]","parameter_code":"00600","statistic":"annual total","qualifier":null,"value":null,"unit":"lb/yr","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594 Floating Caps"},{"outfall":"001","parameter":"Nitrogen, organic total [as N]","parameter_code":"00605","statistic":"monthly average","qualifier":null,"value":null,"unit":"mg/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Nitrogen, ammonia total [as N]","parameter_code":"00610","statistic":"maximum monthly average","qualifier":"<=","value":".5","unit":"mg/L","report_only":false,"enforceable":true,"months":["MAY","JUN","JUL","AUG","SEP"],"limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Nitrogen, ammonia total [as N]","parameter_code":"00610","statistic":"maximum monthly average","qualifier":"<=","value":".6","unit":"mg/L","report_only":false,"enforceable":true,"months":["JAN","FEB","MAR","APR","OCT","NOV","DEC"],"limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Nitrogen, ammonia total [as N]","parameter_code":"00610","statistic":"maximum daily average","qualifier":"<=","value":"1.9","unit":"mg/L","report_only":false,"enforceable":true,"months":["MAY","JUN","JUL","AUG","SEP"],"limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Nitrogen, ammonia total [as N]","parameter_code":"00610","statistic":"maximum daily average","qualifier":"<=","value":"2.5","unit":"mg/L","report_only":false,"enforceable":true,"months":["JAN","FEB","MAR","APR","OCT","NOV","DEC"],"limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Nitrogen, ammonia total [as N]","parameter_code":"00610","statistic":"maximum monthly average","qualifier":"<=","value":"2.5","unit":"lb/d","report_only":false,"enforceable":true,"months":["MAY","JUN","JUL","AUG","SEP"],"limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Nitrogen, ammonia total [as N]","parameter_code":"00610","statistic":"maximum monthly average","qualifier":"<=","value":"3","unit":"lb/d","report_only":false,"enforceable":true,"months":["JAN","FEB","MAR","APR","OCT","NOV","DEC"],"limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Nitrogen, ammonia total [as N]","parameter_code":"00610","statistic":"maximum daily average","qualifier":"<=","value":"9.5","unit":"lb/d","report_only":false,"enforceable":true,"months":["MAY","JUN","JUL","AUG","SEP"],"limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Nitrogen, ammonia total [as N]","parameter_code":"00610","statistic":"maximum daily average","qualifier":"<=","value":"12.5","unit":"lb/d","report_only":false,"enforceable":true,"months":["JAN","FEB","MAR","APR","OCT","NOV","DEC"],"limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Nitrogen, Kjeldahl, total [as N]","parameter_code":"00625","statistic":"monthly average","qualifier":null,"value":null,"unit":"mg/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Nitrite + Nitrate total [as N]","parameter_code":"00630","statistic":"monthly average","qualifier":null,"value":null,"unit":"mg/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Phosphorus, total [as P]","parameter_code":"00665","statistic":"maximum monthly average","qualifier":"<=","value":".3","unit":"mg/L","report_only":false,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Phosphorus, total [as P]","parameter_code":"00665","statistic":"maximum weekly average","qualifier":"<=","value":".45","unit":"mg/L","report_only":false,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Phosphorus, total [as P]","parameter_code":"00665","statistic":"annual maximum","qualifier":null,"value":null,"unit":"lb/yr","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Phosphorus, total [as P]","parameter_code":"00665","statistic":"maximum monthly average","qualifier":"<=","value":"1.5","unit":"lb/d","report_only":false,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Phosphorus, total [as P]","parameter_code":"00665","statistic":"maximum weekly average","qualifier":"<=","value":"2.3","unit":"lb/d","report_only":false,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Phosphorus, total [as P]","parameter_code":"00665","statistic":"monthly total","qualifier":null,"value":null,"unit":"lb/mo","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Phosphorus, total [as P]","parameter_code":"00665","statistic":"annual total","qualifier":null,"value":null,"unit":"lb/yr","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594 Floating Caps"},{"outfall":"001","parameter":"Phosphorus, total [as P]","parameter_code":"00665","statistic":"annual total","qualifier":null,"value":null,"unit":"lb/yr","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594 Floating Caps"},{"outfall":"001","parameter":"Cyanide, free [as free]","parameter_code":"00717","statistic":"minimum","qualifier":null,"value":null,"unit":"ug/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Sulfate, dissolved [as SO4]","parameter_code":"00946","statistic":"minimum","qualifier":null,"value":null,"unit":"ug/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Aluminum, total recoverable","parameter_code":"01104","statistic":"monthly average","qualifier":null,"value":null,"unit":"mg/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Phosphate, ortho [as P]","parameter_code":"04175","statistic":"monthly average","qualifier":null,"value":null,"unit":"mg/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Acrylonitrile","parameter_code":"34215","statistic":"minimum","qualifier":null,"value":null,"unit":"ug/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Benzo[b]fluoranthene","parameter_code":"34230","statistic":"minimum","qualifier":null,"value":null,"unit":"ug/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Benzo[k]fluoranthene","parameter_code":"34242","statistic":"minimum","qualifier":null,"value":null,"unit":"ug/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Chrysene","parameter_code":"34320","statistic":"minimum","qualifier":null,"value":null,"unit":"ug/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Indeno[1,2,3-cd]pyrene","parameter_code":"34403","statistic":"minimum","qualifier":null,"value":null,"unit":"ug/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"N-Nitrosodi-N-propylamine","parameter_code":"34428","statistic":"minimum","qualifier":null,"value":null,"unit":"ug/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"N-Nitrosodimethylamine [NDMA]","parameter_code":"34438","statistic":"minimum","qualifier":null,"value":null,"unit":"ug/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Benzo[a]anthracene","parameter_code":"34526","statistic":"minimum","qualifier":null,"value":null,"unit":"ug/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"3,3'-Dichlorobenzidine","parameter_code":"34631","statistic":"minimum","qualifier":null,"value":null,"unit":"ug/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Benzidine","parameter_code":"39120","statistic":"minimum","qualifier":null,"value":null,"unit":"ug/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"4,4'-DDT","parameter_code":"39300","statistic":"minimum","qualifier":null,"value":null,"unit":"ug/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"4,4'-DDD","parameter_code":"39310","statistic":"minimum","qualifier":null,"value":null,"unit":"ug/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"4,4'-DDE","parameter_code":"39320","statistic":"minimum","qualifier":null,"value":null,"unit":"ug/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Aldrin","parameter_code":"39330","statistic":"minimum","qualifier":null,"value":null,"unit":"ug/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Chlordane [tech mix. and metabolites]","parameter_code":"39350","statistic":"minimum","qualifier":null,"value":null,"unit":"ug/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Dieldrin","parameter_code":"39380","statistic":"minimum","qualifier":null,"value":null,"unit":"ug/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Toxaphene","parameter_code":"39400","statistic":"minimum","qualifier":null,"value":null,"unit":"ug/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Heptachlor","parameter_code":"39410","statistic":"minimum","qualifier":null,"value":null,"unit":"ug/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Heptachlor epoxide","parameter_code":"39420","statistic":"minimum","qualifier":null,"value":null,"unit":"ug/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Polychlorinated biphenyls [PCBs]","parameter_code":"39516","statistic":"minimum","qualifier":null,"value":null,"unit":"ug/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Hexachlorobenzene","parameter_code":"39700","statistic":"minimum","qualifier":null,"value":null,"unit":"ug/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Temperature, length of excursion","parameter_code":"45600","statistic":"value","qualifier":"<=","value":"1","unit":"d","report_only":false,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Temperature, length of excursion","parameter_code":"45600","statistic":"value","qualifier":null,"value":null,"unit":"hr","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Temperature, length of excursion","parameter_code":"45600","statistic":"value","qualifier":"<=","value":"1","unit":"d","report_only":false,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Flow, in conduit or thru treatment plant","parameter_code":"50050","statistic":"maximum","qualifier":"<=","value":".55","unit":"MGD","report_only":false,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"E. coli","parameter_code":"51040","statistic":"maximum","qualifier":"<=","value":"126","unit":"MPN/100mL","report_only":false,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"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":"22-DP-0594 0.55 MDG"},{"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":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Flow, total","parameter_code":"82220","statistic":"monthly total","qualifier":null,"value":null,"unit":"Mgal/mo","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"001","parameter":"Flow, total","parameter_code":"82220","statistic":"annual total","qualifier":null,"value":null,"unit":"Mgal/yr","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594 Floating Caps"},{"outfall":"001","parameter":"Flow, total","parameter_code":"82220","statistic":"annual total","qualifier":null,"value":null,"unit":"Mgal/yr","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594 Floating Caps"},{"outfall":"001","parameter":"Chloride, dissolved [as Cl]","parameter_code":"82295","statistic":"minimum","qualifier":null,"value":null,"unit":"ug/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594 0.55 MDG"},{"outfall":"002","parameter":"Oxygen, dissolved [DO]","parameter_code":"00300","statistic":"minimum","qualifier":null,"value":null,"unit":"mg/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"002","parameter":"BOD, 5-day, 20 deg. C","parameter_code":"00310","statistic":"maximum monthly average","qualifier":"<=","value":"30","unit":"mg/L","report_only":false,"enforceable":true,"months":["JAN","FEB","MAR","APR","OCT","NOV","DEC"],"limit_set":"22-DP-0594"},{"outfall":"002","parameter":"BOD, 5-day, 20 deg. C","parameter_code":"00310","statistic":"maximum monthly average","qualifier":"<=","value":"20","unit":"mg/L","report_only":false,"enforceable":true,"months":["MAY","JUN","JUL","AUG","SEP"],"limit_set":"22-DP-0594"},{"outfall":"002","parameter":"BOD, 5-day, 20 deg. C","parameter_code":"00310","statistic":"maximum monthly average","qualifier":"<=","value":"30","unit":"mg/L","report_only":false,"enforceable":true,"months":["JAN","FEB","MAR","APR","NOV","DEC"],"limit_set":"22-DP-0594"},{"outfall":"002","parameter":"BOD, 5-day, 20 deg. C","parameter_code":"00310","statistic":"maximum weekly average","qualifier":"<=","value":"30","unit":"mg/L","report_only":false,"enforceable":true,"months":["MAY","JUN","JUL","AUG","SEP"],"limit_set":"22-DP-0594"},{"outfall":"002","parameter":"BOD, 5-day, 20 deg. C","parameter_code":"00310","statistic":"maximum weekly average","qualifier":"<=","value":"45","unit":"mg/L","report_only":false,"enforceable":true,"months":["JAN","FEB","MAR","APR","OCT","NOV","DEC"],"limit_set":"22-DP-0594"},{"outfall":"002","parameter":"BOD, 5-day, 20 deg. C","parameter_code":"00310","statistic":"maximum weekly average","qualifier":"<=","value":"45","unit":"mg/L","report_only":false,"enforceable":true,"months":["JAN","FEB","MAR","APR","NOV","DEC"],"limit_set":"22-DP-0594"},{"outfall":"002","parameter":"BOD, 5-day, 20 deg. C","parameter_code":"00310","statistic":"maximum monthly average","qualifier":"<=","value":"150","unit":"lb/mo","report_only":false,"enforceable":true,"months":["JAN","FEB","MAR","APR","OCT","NOV","DEC"],"limit_set":"22-DP-0594"},{"outfall":"002","parameter":"BOD, 5-day, 20 deg. C","parameter_code":"00310","statistic":"maximum monthly average","qualifier":"<=","value":"100","unit":"lb/d","report_only":false,"enforceable":true,"months":["MAY","JUN","JUL","AUG","SEP"],"limit_set":"22-DP-0594"},{"outfall":"002","parameter":"BOD, 5-day, 20 deg. C","parameter_code":"00310","statistic":"maximum monthly average","qualifier":"<=","value":"150","unit":"lb/d","report_only":false,"enforceable":true,"months":["JAN","FEB","MAR","APR","NOV","DEC"],"limit_set":"22-DP-0594"},{"outfall":"002","parameter":"BOD, 5-day, 20 deg. C","parameter_code":"00310","statistic":"maximum weekly average","qualifier":"<=","value":"225","unit":"lb/mo","report_only":false,"enforceable":true,"months":["JAN","FEB","MAR","APR","OCT","NOV","DEC"],"limit_set":"22-DP-0594"},{"outfall":"002","parameter":"BOD, 5-day, 20 deg. C","parameter_code":"00310","statistic":"maximum weekly average","qualifier":"<=","value":"150","unit":"lb/d","report_only":false,"enforceable":true,"months":["MAY","JUN","JUL","AUG","SEP"],"limit_set":"22-DP-0594"},{"outfall":"002","parameter":"BOD, 5-day, 20 deg. C","parameter_code":"00310","statistic":"maximum weekly average","qualifier":"<=","value":"225","unit":"lb/d","report_only":false,"enforceable":true,"months":["JAN","FEB","MAR","APR","NOV","DEC"],"limit_set":"22-DP-0594"},{"outfall":"002","parameter":"pH","parameter_code":"00400","statistic":"minimum","qualifier":null,"value":null,"unit":"SU","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"002","parameter":"pH","parameter_code":"00400","statistic":"maximum","qualifier":null,"value":null,"unit":"SU","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"002","parameter":"Solids, total suspended","parameter_code":"00530","statistic":"maximum monthly average","qualifier":"<=","value":"30","unit":"mg/L","report_only":false,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"002","parameter":"Solids, total suspended","parameter_code":"00530","statistic":"monthly average","qualifier":null,"value":null,"unit":"mg/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"002","parameter":"Solids, total suspended","parameter_code":"00530","statistic":"maximum weekly average","qualifier":"<=","value":"45","unit":"mg/L","report_only":false,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"002","parameter":"Solids, total suspended","parameter_code":"00530","statistic":"maximum monthly average","qualifier":"<=","value":"150","unit":"lb/d","report_only":false,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"002","parameter":"Solids, total suspended","parameter_code":"00530","statistic":"maximum weekly average","qualifier":"<=","value":"225","unit":"lb/d","report_only":false,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"002","parameter":"Solids, total suspended","parameter_code":"00530","statistic":"annual maximum","qualifier":null,"value":null,"unit":"lb/yr","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"002","parameter":"Solids, total suspended","parameter_code":"00530","statistic":"monthly total","qualifier":null,"value":null,"unit":"lb/mo","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"002","parameter":"Nitrogen, total [as N]","parameter_code":"00600","statistic":"monthly average","qualifier":null,"value":null,"unit":"mg/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"002","parameter":"Nitrogen, total [as N]","parameter_code":"00600","statistic":"monthly average","qualifier":null,"value":null,"unit":"mg/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"002","parameter":"Nitrogen, total [as N]","parameter_code":"00600","statistic":"monthly average","qualifier":null,"value":null,"unit":"mg/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"002","parameter":"Nitrogen, total [as N]","parameter_code":"00600","statistic":"monthly total","qualifier":null,"value":null,"unit":"lb/mo","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"002","parameter":"Nitrogen, total [as N]","parameter_code":"00600","statistic":"annual maximum","qualifier":null,"value":null,"unit":"lb/yr","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"002","parameter":"Nitrogen, organic total [as N]","parameter_code":"00605","statistic":"monthly average","qualifier":null,"value":null,"unit":"mg/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"002","parameter":"Nitrogen, ammonia total [as N]","parameter_code":"00610","statistic":"daily average","qualifier":null,"value":null,"unit":"mg/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"002","parameter":"Nitrogen, ammonia total [as N]","parameter_code":"00610","statistic":"average value","qualifier":null,"value":null,"unit":"mg/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"002","parameter":"Nitrogen, ammonia total [as N]","parameter_code":"00610","statistic":"monthly average","qualifier":null,"value":null,"unit":"mg/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"002","parameter":"Nitrogen, ammonia total [as N]","parameter_code":"00610","statistic":"daily average","qualifier":null,"value":null,"unit":"lb/d","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"002","parameter":"Nitrogen, ammonia total [as N]","parameter_code":"00610","statistic":"average value","qualifier":null,"value":null,"unit":"lb/d","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"002","parameter":"Nitrogen, Kjeldahl, total [as N]","parameter_code":"00625","statistic":"monthly average","qualifier":null,"value":null,"unit":"mg/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"002","parameter":"Nitrite + Nitrate total [as N]","parameter_code":"00630","statistic":"monthly average","qualifier":null,"value":null,"unit":"mg/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"002","parameter":"Phosphorus, total [as P]","parameter_code":"00665","statistic":"maximum monthly average","qualifier":"<=","value":".3","unit":"mg/L","report_only":false,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"002","parameter":"Phosphorus, total [as P]","parameter_code":"00665","statistic":"monthly average","qualifier":null,"value":null,"unit":"mg/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"002","parameter":"Phosphorus, total [as P]","parameter_code":"00665","statistic":"monthly average","qualifier":null,"value":null,"unit":"mg/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"002","parameter":"Phosphorus, total [as P]","parameter_code":"00665","statistic":"maximum weekly average","qualifier":"<=","value":".45","unit":"mg/L","report_only":false,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"002","parameter":"Phosphorus, total [as P]","parameter_code":"00665","statistic":"maximum monthly average","qualifier":"<=","value":"1.5","unit":"lb/d","report_only":false,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"002","parameter":"Phosphorus, total [as P]","parameter_code":"00665","statistic":"annual maximum","qualifier":null,"value":null,"unit":"lb/yr","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"002","parameter":"Phosphorus, total [as P]","parameter_code":"00665","statistic":"maximum weekly average","qualifier":"<=","value":"2.3","unit":"lb/d","report_only":false,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"002","parameter":"Phosphorus, total [as P]","parameter_code":"00665","statistic":"monthly total","qualifier":null,"value":null,"unit":"lb/mo","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"002","parameter":"Phosphate, ortho [as P]","parameter_code":"04175","statistic":"monthly average","qualifier":null,"value":null,"unit":"mg/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"002","parameter":"Flow, in conduit or thru treatment plant","parameter_code":"50050","statistic":"annual maximum","qualifier":"<=","value":".6","unit":"MGD","report_only":false,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"002","parameter":"E. coli","parameter_code":"51040","statistic":"maximum","qualifier":null,"value":null,"unit":"MPN/100mL","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"002","parameter":"BOD, 5-day, percent removal","parameter_code":"81010","statistic":"monthly average","qualifier":null,"value":null,"unit":"%","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"002","parameter":"Solids, suspended percent removal","parameter_code":"81011","statistic":"monthly average","qualifier":null,"value":null,"unit":"%","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"002","parameter":"Flow, total","parameter_code":"82220","statistic":"monthly total","qualifier":null,"value":null,"unit":"MGD","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"101","parameter":"Oxygen, dissolved [DO]","parameter_code":"00300","statistic":"minimum","qualifier":null,"value":null,"unit":"mg/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"101","parameter":"BOD, 5-day, 20 deg. C","parameter_code":"00310","statistic":"monthly average","qualifier":null,"value":null,"unit":"mg/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"101","parameter":"BOD, 5-day, 20 deg. C","parameter_code":"00310","statistic":"weekly maximum","qualifier":null,"value":null,"unit":"mg/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"101","parameter":"BOD, 5-day, 20 deg. C","parameter_code":"00310","statistic":"monthly average","qualifier":null,"value":null,"unit":"lb/d","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"101","parameter":"BOD, 5-day, 20 deg. C","parameter_code":"00310","statistic":"weekly maximum","qualifier":null,"value":null,"unit":"lb/d","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"101","parameter":"pH","parameter_code":"00400","statistic":"minimum","qualifier":null,"value":null,"unit":"SU","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"101","parameter":"pH","parameter_code":"00400","statistic":"maximum","qualifier":null,"value":null,"unit":"SU","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"101","parameter":"Solids, total suspended","parameter_code":"00530","statistic":"monthly average","qualifier":null,"value":null,"unit":"mg/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"101","parameter":"Solids, total suspended","parameter_code":"00530","statistic":"weekly maximum","qualifier":null,"value":null,"unit":"mg/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"101","parameter":"Solids, total suspended","parameter_code":"00530","statistic":"monthly average","qualifier":null,"value":null,"unit":"lb/d","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"101","parameter":"Solids, total suspended","parameter_code":"00530","statistic":"weekly maximum","qualifier":null,"value":null,"unit":"lb/d","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"101","parameter":"Solids, total suspended","parameter_code":"00530","statistic":"annual maximum","qualifier":"<=","value":"82000","unit":"lb/yr","report_only":false,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"101","parameter":"Solids, total suspended","parameter_code":"00530","statistic":"monthly total","qualifier":null,"value":null,"unit":"lb/mo","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"101","parameter":"Nitrogen, total [as N]","parameter_code":"00600","statistic":"monthly average","qualifier":null,"value":null,"unit":"mg/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"101","parameter":"Nitrogen, total [as N]","parameter_code":"00600","statistic":"monthly total","qualifier":null,"value":null,"unit":"lb/mo","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"101","parameter":"Nitrogen, total [as N]","parameter_code":"00600","statistic":"annual maximum","qualifier":"<=","value":"10964","unit":"lb/yr","report_only":false,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"101","parameter":"Nitrogen, organic total [as N]","parameter_code":"00605","statistic":"monthly average","qualifier":null,"value":null,"unit":"mg/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"101","parameter":"Nitrogen, ammonia total [as N]","parameter_code":"00610","statistic":"monthly average","qualifier":null,"value":null,"unit":"mg/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"101","parameter":"Nitrogen, ammonia total [as N]","parameter_code":"00610","statistic":"daily maximum","qualifier":null,"value":null,"unit":"mg/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"101","parameter":"Nitrogen, ammonia total [as N]","parameter_code":"00610","statistic":"monthly average","qualifier":null,"value":null,"unit":"lb/d","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"101","parameter":"Nitrogen, ammonia total [as N]","parameter_code":"00610","statistic":"daily maximum","qualifier":null,"value":null,"unit":"lb/d","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"101","parameter":"Nitrite + Nitrate total [as N]","parameter_code":"00630","statistic":"monthly average","qualifier":null,"value":null,"unit":"mg/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"101","parameter":"Phosphorus, total [as P]","parameter_code":"00665","statistic":"monthly average","qualifier":null,"value":null,"unit":"mg/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"101","parameter":"Phosphorus, total [as P]","parameter_code":"00665","statistic":"weekly maximum","qualifier":null,"value":null,"unit":"mg/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"101","parameter":"Phosphorus, total [as P]","parameter_code":"00665","statistic":"monthly average","qualifier":null,"value":null,"unit":"lb/d","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"101","parameter":"Phosphorus, total [as P]","parameter_code":"00665","statistic":"monthly total","qualifier":null,"value":null,"unit":"lb/mo","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"101","parameter":"Phosphorus, total [as P]","parameter_code":"00665","statistic":"annual average","qualifier":"<=","value":"822","unit":"lb/yr","report_only":false,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"101","parameter":"Phosphorus, total [as P]","parameter_code":"00665","statistic":"weekly maximum","qualifier":null,"value":null,"unit":"lb/d","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"101","parameter":"Phosphate, ortho [as P]","parameter_code":"04175","statistic":"monthly average","qualifier":null,"value":null,"unit":"mg/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"101","parameter":"Flow, in conduit or thru treatment plant","parameter_code":"50050","statistic":"daily maximum","qualifier":null,"value":null,"unit":"MGD","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"101","parameter":"Flow, in conduit or thru treatment plant","parameter_code":"50050","statistic":"monthly average","qualifier":null,"value":null,"unit":"MGD","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"101","parameter":"E. coli","parameter_code":"51040","statistic":"maximum","qualifier":null,"value":null,"unit":"MPN/100mL","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"102","parameter":"BOD, 5-day, 20 deg. C","parameter_code":"00310","statistic":"monthly average","qualifier":null,"value":null,"unit":"mg/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"102","parameter":"Solids, total suspended","parameter_code":"00530","statistic":"monthly average","qualifier":null,"value":null,"unit":"mg/L","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"TRAD","parameter":"Solids, total suspended","parameter_code":"00530","statistic":"monthly total","qualifier":null,"value":null,"unit":"lb/yr","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"TRAD","parameter":"Solids, total suspended","parameter_code":"00530","statistic":"monthly total","qualifier":null,"value":null,"unit":"lb/yr","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"TRAD","parameter":"Nitrogen, total [as N]","parameter_code":"00600","statistic":"monthly total","qualifier":null,"value":null,"unit":"lb/yr","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"TRAD","parameter":"Nitrogen, total [as N]","parameter_code":"00600","statistic":"monthly total","qualifier":null,"value":null,"unit":"lb/yr","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"TRAD","parameter":"Phosphorus, total [as P]","parameter_code":"00665","statistic":"monthly total","qualifier":null,"value":null,"unit":"lb/yr","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"TRAD","parameter":"Phosphorus, total [as P]","parameter_code":"00665","statistic":"monthly total","qualifier":null,"value":null,"unit":"lb/yr","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"},{"outfall":"TRAD","parameter":"Flow","parameter_code":"74076","statistic":"year-to-date total","qualifier":null,"value":null,"unit":"Mgal/yr","report_only":true,"enforceable":true,"months":"all","limit_set":"22-DP-0594"}],"next":[{"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":"ammonia","place":"US-MD","medium":"surface_water"},"needs":{},"get":"https://passage-data.com/api/v1/limits?parameter=ammonia&place=US-MD&medium=surface_water","url":"https://passage-data.com/api/v1/limits?parameter=ammonia&place=US-MD&medium=surface_water","page":"https://passage-data.com/limits/US-MD/ammonia"},{"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":"MD0022446"},"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=MD0022446"},{"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":"MD0022446"},"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=MD0022446"}]}