{"permit":"MD0056545","name":"Harford County DPW (Sod Run 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/MD0056545"},"about":[{"label":"What it is","text":"Sewage treatment plant · rated a major discharger by EPA"},{"label":"Where","text":"Perryman, Maryland","href":"https://www.openstreetmap.org/?mlat=39.444785&mlon=-76.214571#map=14/39.444785/-76.214571"},{"label":"Last 12 months","text":"No values over a limit"},{"label":"Permit","text":"In force until Oct 31, 2027"}],"renewal_due":null,"renewal_check":{"offered_because":"application_due_within_18_months","application_due":"2027-05-04","price":"free while piloted","order_page":"https://passage-data.com/dmr/p/MD0056545#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":"Oxygen, dissolved [DO]","parameter_code":"00300","statistic":"instantaneous minimum","qualifier":">=","value":"5","unit":"mg/L","report_only":false,"enforceable":true,"months":"all","limit_set":"21-DP-1580"},{"outfall":"001","parameter":"Oxygen, dissolved [DO]","parameter_code":"00300","statistic":"7-day minimum","qualifier":">=","value":"6","unit":"mg/L","report_only":false,"enforceable":true,"months":["FEB","MAR","APR","MAY"],"limit_set":"21-DP-1580"},{"outfall":"001","parameter":"Oxygen, dissolved [DO]","parameter_code":"00300","statistic":"monthly average minimum","qualifier":">=","value":"5.5","unit":"mg/L","report_only":false,"enforceable":true,"months":"all","limit_set":"21-DP-1580"},{"outfall":"001","parameter":"BOD, 5-day, 20 deg. C","parameter_code":"00310","statistic":"maximum monthly average","qualifier":"<=","value":"12","unit":"mg/L","report_only":false,"enforceable":true,"months":["MAY","JUN","JUL","AUG","SEP","OCT"],"limit_set":"21-DP-1580"},{"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","NOV","DEC"],"limit_set":"21-DP-1580"},{"outfall":"001","parameter":"BOD, 5-day, 20 deg. C","parameter_code":"00310","statistic":"maximum weekly average","qualifier":"<=","value":"18","unit":"mg/L","report_only":false,"enforceable":true,"months":["MAY","JUN","JUL","AUG","SEP","OCT"],"limit_set":"21-DP-1580"},{"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","NOV","DEC"],"limit_set":"21-DP-1580"},{"outfall":"001","parameter":"BOD, 5-day, 20 deg. C","parameter_code":"00310","statistic":"maximum monthly average","qualifier":"<=","value":"2000","unit":"lb/d","report_only":false,"enforceable":true,"months":["MAY","JUN","JUL","AUG","SEP","OCT"],"limit_set":"21-DP-1580"},{"outfall":"001","parameter":"BOD, 5-day, 20 deg. C","parameter_code":"00310","statistic":"maximum monthly average","qualifier":"<=","value":"5000","unit":"lb/d","report_only":false,"enforceable":true,"months":["JAN","FEB","MAR","APR","NOV","DEC"],"limit_set":"21-DP-1580"},{"outfall":"001","parameter":"BOD, 5-day, 20 deg. C","parameter_code":"00310","statistic":"maximum weekly average","qualifier":"<=","value":"3000","unit":"lb/d","report_only":false,"enforceable":true,"months":["MAY","JUN","JUL","AUG","SEP","OCT"],"limit_set":"21-DP-1580"},{"outfall":"001","parameter":"BOD, 5-day, 20 deg. C","parameter_code":"00310","statistic":"maximum weekly average","qualifier":"<=","value":"7500","unit":"lb/d","report_only":false,"enforceable":true,"months":["JAN","FEB","MAR","APR","NOV","DEC"],"limit_set":"21-DP-1580"},{"outfall":"001","parameter":"pH","parameter_code":"00400","statistic":"minimum","qualifier":">=","value":"6.5","unit":"SU","report_only":false,"enforceable":true,"months":"all","limit_set":"21-DP-1580"},{"outfall":"001","parameter":"pH","parameter_code":"00400","statistic":"maximum","qualifier":"<=","value":"8.5","unit":"SU","report_only":false,"enforceable":true,"months":"all","limit_set":"21-DP-1580"},{"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":"21-DP-1580"},{"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":"21-DP-1580"},{"outfall":"001","parameter":"Solids, total suspended","parameter_code":"00530","statistic":"maximum monthly average","qualifier":"<=","value":"5000","unit":"lb/d","report_only":false,"enforceable":true,"months":"all","limit_set":"21-DP-1580"},{"outfall":"001","parameter":"Solids, total suspended","parameter_code":"00530","statistic":"maximum weekly average","qualifier":"<=","value":"7500","unit":"lb/d","report_only":false,"enforceable":true,"months":"all","limit_set":"21-DP-1580"},{"outfall":"001","parameter":"Solids, total suspended","parameter_code":"00530","statistic":"cumulative total","qualifier":"<=","value":"1827336","unit":"lb/yr","report_only":false,"enforceable":true,"months":"all","limit_set":"21-DP-1580"},{"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":"21-DP-1580"},{"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":"21-DP-1580"},{"outfall":"001","parameter":"Nitrogen, total [as N]","parameter_code":"00600","statistic":"monthly average","qualifier":null,"value":null,"unit":"lb/mo","report_only":true,"enforceable":true,"months":"all","limit_set":"21-DP-1580"},{"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":"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":"Floating Caps"},{"outfall":"001","parameter":"Nitrogen, total [as N]","parameter_code":"00600","statistic":"cumulative total","qualifier":"<=","value":"243645","unit":"lb/yr","report_only":false,"enforceable":true,"months":"all","limit_set":"21-DP-1580"},{"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":"21-DP-1580"},{"outfall":"001","parameter":"Nitrogen, ammonia total [as N]","parameter_code":"00610","statistic":"maximum monthly average","qualifier":"<=","value":"5.5","unit":"mg/L","report_only":false,"enforceable":true,"months":["MAY","JUN","JUL","AUG","SEP","OCT"],"limit_set":"21-DP-1580"},{"outfall":"001","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":["JAN","FEB","MAR","APR","NOV","DEC"],"limit_set":"21-DP-1580"},{"outfall":"001","parameter":"Nitrogen, ammonia total [as N]","parameter_code":"00610","statistic":"maximum monthly average","qualifier":"<=","value":"920","unit":"lb/d","report_only":false,"enforceable":true,"months":["MAY","JUN","JUL","AUG","SEP","OCT"],"limit_set":"21-DP-1580"},{"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":"21-DP-1580"},{"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":"21-DP-1580"},{"outfall":"001","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":"21-DP-1580"},{"outfall":"001","parameter":"Phosphorus, total [as P]","parameter_code":"00665","statistic":"weekly average","qualifier":null,"value":null,"unit":"mg/L","report_only":true,"enforceable":true,"months":"all","limit_set":"21-DP-1580"},{"outfall":"001","parameter":"Phosphorus, total [as P]","parameter_code":"00665","statistic":"cumulative total","qualifier":"<=","value":"18273","unit":"lb/yr","report_only":false,"enforceable":true,"months":"all","limit_set":"21-DP-1580"},{"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":"21-DP-1580"},{"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":"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":"Floating Caps"},{"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":"21-DP-1580"},{"outfall":"001","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":"21-DP-1580"},{"outfall":"001","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":"21-DP-1580"},{"outfall":"001","parameter":"Chlorine, total residual","parameter_code":"50060","statistic":"maximum","qualifier":"<","value":".1","unit":"mg/L","report_only":false,"enforceable":true,"months":"all","limit_set":"21-DP-1580"},{"outfall":"001","parameter":"Peracetic Acid","parameter_code":"51674","statistic":"maximum","qualifier":"<=","value":"1","unit":"mg/L","report_only":false,"enforceable":true,"months":"all","limit_set":"21-DP-1580"},{"outfall":"001","parameter":"Enterococci","parameter_code":"61211","statistic":"maximum","qualifier":"<=","value":"35","unit":"MPN/100mL","report_only":false,"enforceable":true,"months":"all","limit_set":"21-DP-1580"},{"outfall":"001","parameter":"Polychlorinated biphenyls [PCB] pg/L","parameter_code":"79819","statistic":"quarterly average","qualifier":null,"value":null,"unit":"pg/L","report_only":true,"enforceable":true,"months":"all","limit_set":"21-DP-1580"},{"outfall":"001","parameter":"Polychlorinated biphenyls [PCB] pg/L","parameter_code":"79819","statistic":"quarterly total","qualifier":null,"value":null,"unit":"g/qtr","report_only":true,"enforceable":true,"months":"all","limit_set":"21-DP-1580"},{"outfall":"001","parameter":"Polychlorinated biphenyls [PCB] pg/L","parameter_code":"79819","statistic":"cumulative total","qualifier":null,"value":null,"unit":"g/yr","report_only":true,"enforceable":true,"months":"all","limit_set":"21-DP-1580"},{"outfall":"001","parameter":"BOD, 5-day, percent removal","parameter_code":"81010","statistic":"minimum","qualifier":">=","value":"85","unit":"%","report_only":false,"enforceable":true,"months":"all","limit_set":"21-DP-1580"},{"outfall":"001","parameter":"Solids, suspended percent removal","parameter_code":"81011","statistic":"minimum","qualifier":">=","value":"85","unit":"%","report_only":false,"enforceable":true,"months":"all","limit_set":"21-DP-1580"},{"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":"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":"Floating Caps"},{"outfall":"001","parameter":"Flow, total","parameter_code":"82220","statistic":"total","qualifier":null,"value":null,"unit":"Mgal/mo","report_only":true,"enforceable":true,"months":"all","limit_set":"21-DP-1580"},{"outfall":"TRAD","parameter":"Solids, total suspended","parameter_code":"00530","statistic":"cumulative total","qualifier":null,"value":null,"unit":"lb/yr","report_only":true,"enforceable":true,"months":"all","limit_set":"21-DP-1580A"},{"outfall":"TRAD","parameter":"Solids, total suspended","parameter_code":"00530","statistic":"cumulative total","qualifier":null,"value":null,"unit":"lb/yr","report_only":true,"enforceable":true,"months":"all","limit_set":"21-DP-1580A"},{"outfall":"TRAD","parameter":"Nitrogen, total [as N]","parameter_code":"00600","statistic":"cumulative total","qualifier":null,"value":null,"unit":"lb/yr","report_only":true,"enforceable":true,"months":"all","limit_set":"21-DP-1580A"},{"outfall":"TRAD","parameter":"Nitrogen, total [as N]","parameter_code":"00600","statistic":"cumulative total","qualifier":null,"value":null,"unit":"lb/yr","report_only":true,"enforceable":true,"months":"all","limit_set":"21-DP-1580A"},{"outfall":"TRAD","parameter":"Phosphorus, total [as P]","parameter_code":"00665","statistic":"cumulative total","qualifier":null,"value":null,"unit":"lb/yr","report_only":true,"enforceable":true,"months":"all","limit_set":"21-DP-1580A"},{"outfall":"TRAD","parameter":"Phosphorus, total [as P]","parameter_code":"00665","statistic":"cumulative total","qualifier":null,"value":null,"unit":"lb/yr","report_only":true,"enforceable":true,"months":"all","limit_set":"21-DP-1580A"},{"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":"21-DP-1580A"}],"next":[{"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":"MD0056545"},"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=MD0056545"},{"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":"MD0056545"},"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=MD0056545"}]}