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NPDES permit MD0021831 · Major POTW · effective, expires 2031-07-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file
Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

EPA's record, 2025-09-01 to 2026-08-31

0values over a limit
0required values missing, on 0 form(s)
0of 11 forms filed late

Last period with anything received: 2026-07-31.

Reporting

Reports are due about 28 days after each monitoring period ends (the most common figure among MD permits in EPA's filings — check your permit).

Limits in force (96)

OutfallParameterStatisticLimitMonths
001ConductivityMO AVG report only all year
001Oxygen, dissolved [DO]INST MIN >= 5 mg/L all year
001BOD, 5-day, 20 deg. CMX MO AV <= 30 mg/L all year
001BOD, 5-day, 20 deg. CMX WK AV <= 45 mg/L all year
001BOD, 5-day, 20 deg. CMX MO AV <= 1300 lb/d all year
001BOD, 5-day, 20 deg. CMX WK AV <= 1900 lb/d all year
001pHMINIMUM >= 6.5 SU all year
001pHMAXIMUM <= 8.5 SU all year
001Solids, total suspendedMX MO AV <= 30 mg/L all year
001Solids, total suspendedMX WK AV <= 45 mg/L all year
001Solids, total suspendedMX MO AV <= 1300 lb/d all year
001Solids, total suspendedMX WK AV <= 1900 lb/d all year
001Solids, total suspendedCUM TOTL <= 456834 lb/yr all year
001Solids, total suspendedMO TOTAL report only all year
001Solids, total suspendedANNL TOT report only Dec
001Nitrogen, total [as N]MO AVG report only all year
001Nitrogen, total [as N]MO TOTAL report only all year
001Nitrogen, total [as N]CUM TOTL <= 60911 lb/yr all year
001Nitrogen, total [as N]ANNL TOT report only all year
001Nitrogen, total [as N]ANNL TOT report only all year
001Nitrogen, total [as N]ANNL TOT report only Dec
001Nitrogen, organic total [as N]MO AVG report only all year
001Nitrogen, ammonia total [as N]MX MO AV <= 2.7 mg/L May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MX MO AV <= 5.5 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, ammonia total [as N]MX MO AV <= 113 lb/d May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MX MO AV <= 229 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, Kjeldahl, total [as N]MO AVG report only all year
001Nitrite + Nitrate total [as N]MO AVG report only all year
001Phosphorus, total [as P]MO AVG report only all year
001Phosphorus, total [as P]CUM TOTL <= 4568 lb/yr all year
001Phosphorus, total [as P]MO TOTAL report only all year
001Phosphorus, total [as P]ANNL TOT report only all year
001Phosphorus, total [as P]ANNL TOT report only all year
001Phosphorus, total [as P]ANNL TOT report only Dec
001Hardness, total [as CaCO3]MO AVG report only all year
001Hardness, total [as CaCO3]MO AVG report only all year
001Arsenic, total recoverableMO AVG report only Mar, Jun, Sep, Dec
001Selenium, total recoverableVALUE report only Mar, Jun, Sep, Dec
001Cadmium, total recoverableVALUE report only Mar, Jun, Sep, Dec
001Lead, total recoverableVALUE report only Mar, Jun, Sep, Dec
001Phosphate, ortho [as P]MO AVG report only all year
001AcroleinMO AVG report only Mar, Jun, Sep, Dec
001Benzo[b]fluorantheneMO AVG report only Mar, Jun, Sep, Dec
001Benzo[k]fluorantheneMO AVG report only Mar, Jun, Sep, Dec
001Benzo[a]pyreneMO AVG report only Mar, Jun, Sep, Dec
001ChryseneMO AVG report only Mar, Jun, Sep, Dec
0011,2-DiphenylhydrazineMO AVG report only Mar, Jun, Sep, Dec
001.beta.-EndosulfanMO AVG report only Mar, Jun, Sep, Dec
001.alpha.-EndosulfanMO AVG report only Mar, Jun, Sep, Dec
001Indeno[1,2,3-cd]pyreneMO AVG report only Mar, Jun, Sep, Dec
001N-Nitrosodi-N-propylamineMO AVG report only Mar, Jun, Sep, Dec
001N-Nitrosodimethylamine [NDMA]MO AVG report only Mar, Jun, Sep, Dec
001Benzo[a]anthraceneMO AVG report only Mar, Jun, Sep, Dec
001Dibenz[a,h]anthraceneMO AVG report only Mar, Jun, Sep, Dec
0013,3'-DichlorobenzidineMO AVG report only Mar, Jun, Sep, Dec
0014,6-Dinitro-o-cresolMO AVG report only Mar, Jun, Sep, Dec
001PentachlorophenolVALUE report only Mar, Jun, Sep, Dec
001PentachlorophenolMO AVG report only Mar, Jun, Sep, Dec
001BenzidineVALUE report only Mar, Jun, Sep, Dec
001BenzidineMO AVG report only Mar, Jun, Sep, Dec
0014,4'-DDTMO AVG report only Mar, Jun, Sep, Dec
0014,4'-DDDMO AVG report only Mar, Jun, Sep, Dec
0014,4'-DDEMO AVG report only Mar, Jun, Sep, Dec
001AldrinVALUE report only Mar, Jun, Sep, Dec
001AldrinMO AVG report only Mar, Jun, Sep, Dec
001.alpha.-BHCMO AVG report only Mar, Jun, Sep, Dec
001.beta.-BHCMO AVG report only Mar, Jun, Sep, Dec
001Chlordane [tech mix. and metabolites]MO AVG report only Mar, Jun, Sep, Dec
001DieldrinMO AVG report only Mar, Jun, Sep, Dec
001EndrinMO AVG report only Mar, Jun, Sep, Dec
001ToxapheneMO AVG report only Mar, Jun, Sep, Dec
001HeptachlorMO AVG report only Mar, Jun, Sep, Dec
001Heptachlor epoxideMO AVG report only Mar, Jun, Sep, Dec
001HexachlorobenzeneMO AVG report only Mar, Jun, Sep, Dec
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Chlorine, total residualINST MAX <= .012 mg/L all year
001E. coliGX <= 126 MPN/100mL all year
001Solids, total dissolved [TDS]MO AVG report only all year
001BOD, 5-day, percent removalMO AV MN >= 85 % all year
001Solids, suspended percent removalMO AV MN >= 85 % all year
001Flow, totalANNL TOT report only Dec
001Flow, totalMO TOTAL report only all year
001Flow, totalANNL TOT report only all year
001Flow, totalANNL TOT report only all year
101BOD, 5-day, 20 deg. CMO AVG report only all year
101BOD, 5-day, 20 deg. CMO AVG report only all year
101Solids, total suspendedMO AVG report only all year
101Solids, total suspendedMO AVG report only all year
TRADSolids, total suspendedMO TOTAL report only all year
TRADSolids, total suspendedMO TOTAL report only all year
TRADNitrogen, total [as N]MO TOTAL report only all year
TRADNitrogen, total [as N]MO TOTAL report only all year
TRADPhosphorus, total [as P]MO TOTAL report only all year
TRADPhosphorus, total [as P]MO TOTAL report only all year
TRADFlowYA report only all year

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states