{"permit":"MD0023914","name":"SOUTHERN MD. PRE-RELEASE UNIT","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/MD0023914"},"about":[{"label":"What it is","text":"Correctional Institutions (EPA's industry listing)"},{"label":"Where","text":"Hughesville, Maryland","href":"https://www.openstreetmap.org/?mlat=38.508333&mlon=-76.814722#map=14/38.508333/-76.814722"},{"label":"Last 12 months","text":"No values over a limit"},{"label":"Permit","text":"In force until Feb 28, 2030"}],"renewal_due":null,"renewal_check":null,"sector":{"state":"MD","sic":"92","permits":6,"list":"https://passage-data.com/api/v1/permits?state=MD&sic=92","page":"https://passage-data.com/dmr/s/MD/92"},"limits_from_version":null,"record":{"last_filed":"2026-08-31","over":0,"over_by":[],"window":["2025-10-01","2026-09-30"]},"over_limits":[],"upcoming":[{"parameter":"Nitrogen, ammonia total [as N]","outfall":"001","limit":0.6,"unit":"mg/L","statistic":"maximum monthly average","statistic_code":"M2","begin":"2027-04-01","kind":"tighter","months":["MAY","JUN","JUL","AUG","SEP","OCT"],"now":null},{"parameter":"Nitrogen, ammonia total [as N]","outfall":"001","limit":0.1,"unit":"lb/d","statistic":"maximum monthly average","statistic_code":"M2","begin":"2027-04-01","kind":"tighter","months":["MAY","JUN","JUL","AUG","SEP","OCT"],"now":null},{"parameter":"Nitrogen, ammonia total [as N]","outfall":"001","limit":1.8,"unit":"mg/L","statistic":"maximum monthly average","statistic_code":"M2","begin":"2027-04-01","kind":"tighter","months":["JAN","FEB","MAR","APR","NOV","DEC"],"now":null},{"parameter":"Nitrogen, ammonia total [as N]","outfall":"001","limit":0.3,"unit":"lb/d","statistic":"maximum monthly average","statistic_code":"M2","begin":"2027-04-01","kind":"tighter","months":["JAN","FEB","MAR","APR","NOV","DEC"],"now":null},{"parameter":"Nitrogen, ammonia total [as N]","outfall":"001","limit":2.5,"unit":"mg/L","statistic":"maximum daily average","statistic_code":"MQ","begin":"2027-04-01","kind":"tighter","months":["MAY","JUN","JUL","AUG","SEP","OCT"],"now":null},{"parameter":"Nitrogen, ammonia total [as N]","outfall":"001","limit":0.42,"unit":"lb/d","statistic":"maximum daily average","statistic_code":"MQ","begin":"2027-04-01","kind":"tighter","months":["MAY","JUN","JUL","AUG","SEP","OCT"],"now":null},{"parameter":"Nitrogen, ammonia total [as N]","outfall":"001","limit":7.6,"unit":"mg/L","statistic":"maximum daily average","statistic_code":"MQ","begin":"2027-04-01","kind":"tighter","months":["JAN","FEB","MAR","APR","NOV","DEC"],"now":null},{"parameter":"Nitrogen, ammonia total [as N]","outfall":"001","limit":1.3,"unit":"lb/d","statistic":"maximum daily average","statistic_code":"MQ","begin":"2027-04-01","kind":"tighter","months":["JAN","FEB","MAR","APR","NOV","DEC"],"now":null}],"limits":[{"outfall":"001","parameter":"Oxygen, dissolved [DO]","parameter_code":"00300","statistic":"instantaneous minimum","qualifier":">=","value":"7","unit":"mg/L","report_only":false,"enforceable":true,"months":"all","limit_set":"21-DP-0750"},{"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-0750"},{"outfall":"001","parameter":"BOD, 5-day, 20 deg. C","parameter_code":"00310","statistic":"maximum monthly average","qualifier":"<=","value":"6","unit":"mg/L","report_only":false,"enforceable":true,"months":["MAY","JUN","JUL","AUG","SEP","OCT"],"limit_set":"21-DP-0750"},{"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-0750"},{"outfall":"001","parameter":"BOD, 5-day, 20 deg. C","parameter_code":"00310","statistic":"maximum weekly average","qualifier":"<=","value":"9","unit":"mg/L","report_only":false,"enforceable":true,"months":["MAY","JUN","JUL","AUG","SEP","OCT"],"limit_set":"21-DP-0750"},{"outfall":"001","parameter":"BOD, 5-day, 20 deg. C","parameter_code":"00310","statistic":"maximum monthly average","qualifier":"<=","value":"5","unit":"lb/d","report_only":false,"enforceable":true,"months":["JAN","FEB","MAR","APR","NOV","DEC"],"limit_set":"21-DP-0750"},{"outfall":"001","parameter":"BOD, 5-day, 20 deg. C","parameter_code":"00310","statistic":"maximum monthly average","qualifier":"<=","value":"1","unit":"lb/d","report_only":false,"enforceable":true,"months":["MAY","JUN","JUL","AUG","SEP","OCT"],"limit_set":"21-DP-0750"},{"outfall":"001","parameter":"BOD, 5-day, 20 deg. C","parameter_code":"00310","statistic":"maximum weekly average","qualifier":"<=","value":"7.5","unit":"lb/d","report_only":false,"enforceable":true,"months":["JAN","FEB","MAR","APR","NOV","DEC"],"limit_set":"21-DP-0750"},{"outfall":"001","parameter":"BOD, 5-day, 20 deg. C","parameter_code":"00310","statistic":"maximum weekly average","qualifier":"<=","value":"1.5","unit":"lb/d","report_only":false,"enforceable":true,"months":["MAY","JUN","JUL","AUG","SEP","OCT"],"limit_set":"21-DP-0750"},{"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-0750"},{"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-0750"},{"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-0750"},{"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-0750"},{"outfall":"001","parameter":"Solids, total suspended","parameter_code":"00530","statistic":"maximum monthly average","qualifier":"<=","value":"5","unit":"lb/d","report_only":false,"enforceable":true,"months":"all","limit_set":"21-DP-0750"},{"outfall":"001","parameter":"Solids, total suspended","parameter_code":"00530","statistic":"maximum weekly average","qualifier":"<=","value":"7.5","unit":"lb/d","report_only":false,"enforceable":true,"months":"all","limit_set":"21-DP-0750"},{"outfall":"001","parameter":"Solids, total suspended","parameter_code":"00530","statistic":"cumulative total","qualifier":"<=","value":"1827","unit":"lb/yr","report_only":false,"enforceable":true,"months":"all","limit_set":"21-DP-0750"},{"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-0750"},{"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-0750"},{"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":"21-DP-0750"},{"outfall":"001","parameter":"Nitrogen, total [as N]","parameter_code":"00600","statistic":"cumulative total","qualifier":"<=","value":"274","unit":"lb/yr","report_only":false,"enforceable":true,"months":"all","limit_set":"21-DP-0750"},{"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-0750"},{"outfall":"001","parameter":"Nitrogen, ammonia total [as N]","parameter_code":"00610","statistic":"maximum monthly average","qualifier":"<=","value":"1.8","unit":"mg/L","report_only":false,"enforceable":true,"months":["MAY","JUN","JUL","AUG","SEP","OCT"],"limit_set":"21-DP-0750"},{"outfall":"001","parameter":"Nitrogen, ammonia total [as N]","parameter_code":"00610","statistic":"maximum monthly average","qualifier":"<=","value":"5.1","unit":"mg/L","report_only":false,"enforceable":true,"months":["JAN","FEB","MAR","APR","NOV","DEC"],"limit_set":"21-DP-0750"},{"outfall":"001","parameter":"Nitrogen, ammonia total [as N]","parameter_code":"00610","statistic":"maximum daily average","qualifier":"<=","value":"14.4","unit":"mg/L","report_only":false,"enforceable":true,"months":["MAY","JUN","JUL","AUG","SEP","OCT"],"limit_set":"21-DP-0750"},{"outfall":"001","parameter":"Nitrogen, ammonia total [as N]","parameter_code":"00610","statistic":"maximum daily average","qualifier":"<=","value":"18","unit":"mg/L","report_only":false,"enforceable":true,"months":["JAN","FEB","MAR","APR","NOV","DEC"],"limit_set":"21-DP-0750"},{"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":["MAY","JUN","JUL","AUG","SEP","OCT"],"limit_set":"21-DP-0750"},{"outfall":"001","parameter":"Nitrogen, ammonia total [as N]","parameter_code":"00610","statistic":"maximum monthly average","qualifier":"<=","value":".85","unit":"lb/d","report_only":false,"enforceable":true,"months":["JAN","FEB","MAR","APR","NOV","DEC"],"limit_set":"21-DP-0750"},{"outfall":"001","parameter":"Nitrogen, ammonia total [as N]","parameter_code":"00610","statistic":"maximum daily average","qualifier":"<=","value":"2.4","unit":"lb/d","report_only":false,"enforceable":true,"months":["MAY","JUN","JUL","AUG","SEP","OCT"],"limit_set":"21-DP-0750"},{"outfall":"001","parameter":"Nitrogen, ammonia total [as N]","parameter_code":"00610","statistic":"maximum daily average","qualifier":"<=","value":"3","unit":"lb/d","report_only":false,"enforceable":true,"months":["JAN","FEB","MAR","APR","NOV","DEC"],"limit_set":"21-DP-0750"},{"outfall":"001","parameter":"Nitrogen, Kjeldahl, total [as N]","parameter_code":"00625","statistic":"maximum monthly average","qualifier":"<=","value":"3","unit":"mg/L","report_only":false,"enforceable":true,"months":["MAY","JUN","JUL","AUG","SEP","OCT"],"limit_set":"21-DP-0750"},{"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":["JAN","FEB","MAR","APR","NOV","DEC"],"limit_set":"21-DP-0750"},{"outfall":"001","parameter":"Nitrogen, Kjeldahl, total [as N]","parameter_code":"00625","statistic":"maximum weekly average","qualifier":"<=","value":"4.5","unit":"mg/L","report_only":false,"enforceable":true,"months":["MAY","JUN","JUL","AUG","SEP","OCT"],"limit_set":"21-DP-0750"},{"outfall":"001","parameter":"Nitrogen, Kjeldahl, total [as N]","parameter_code":"00625","statistic":"weekly average","qualifier":null,"value":null,"unit":"mg/L","report_only":true,"enforceable":true,"months":["JAN","FEB","MAR","APR","NOV","DEC"],"limit_set":"21-DP-0750"},{"outfall":"001","parameter":"Nitrogen, Kjeldahl, total [as N]","parameter_code":"00625","statistic":"maximum monthly average","qualifier":"<=","value":".5","unit":"lb/d","report_only":false,"enforceable":true,"months":["MAY","JUN","JUL","AUG","SEP","OCT"],"limit_set":"21-DP-0750"},{"outfall":"001","parameter":"Nitrogen, Kjeldahl, total [as N]","parameter_code":"00625","statistic":"monthly average","qualifier":null,"value":null,"unit":"lb/d","report_only":true,"enforceable":true,"months":["JAN","FEB","MAR","APR","NOV","DEC"],"limit_set":"21-DP-0750"},{"outfall":"001","parameter":"Nitrogen, Kjeldahl, total [as N]","parameter_code":"00625","statistic":"maximum weekly average","qualifier":"<=","value":".75","unit":"lb/d","report_only":false,"enforceable":true,"months":["MAY","JUN","JUL","AUG","SEP","OCT"],"limit_set":"21-DP-0750"},{"outfall":"001","parameter":"Nitrogen, Kjeldahl, total [as N]","parameter_code":"00625","statistic":"weekly average","qualifier":null,"value":null,"unit":"lb/d","report_only":true,"enforceable":true,"months":["JAN","FEB","MAR","APR","NOV","DEC"],"limit_set":"21-DP-0750"},{"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-0750"},{"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-0750"},{"outfall":"001","parameter":"Phosphorus, total [as P]","parameter_code":"00665","statistic":"cumulative total","qualifier":"<=","value":"46","unit":"lb/yr","report_only":false,"enforceable":true,"months":"all","limit_set":"21-DP-0750"},{"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-0750"},{"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-0750"},{"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-0750"},{"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-0750"},{"outfall":"001","parameter":"Chlorine, total residual","parameter_code":"50060","statistic":"daily maximum","qualifier":"<=","value":".011","unit":"mg/L","report_only":false,"enforceable":true,"months":"all","limit_set":"21-DP-0750"},{"outfall":"001","parameter":"E. coli","parameter_code":"51040","statistic":"maximum monthly geometric mean","qualifier":"<=","value":"126","unit":"MPN/100mL","report_only":false,"enforceable":true,"months":"all","limit_set":"21-DP-0750"},{"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":"21-DP-0750"},{"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":"21-DP-0750"},{"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":"21-DP-0750"},{"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":"21-DP-0750"},{"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":"21-DP-0750"}],"next":[{"tool":"list_permits","says":"Screening this industry? list_permits lists every permit of it in this state in one call, each with its page and its get_permit address; `get` is the address to fetch.","arguments":{"state":"MD","sic":"92"},"needs":{},"get":"https://passage-data.com/api/v1/permits?state=MD&sic=92","url":"https://passage-data.com/api/v1/permits?state=MD&sic=92","page":"https://passage-data.com/dmr/s/MD/92"},{"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":"MD0023914"},"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=MD0023914"},{"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":"MD0023914"},"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=MD0023914"}]}