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NPDES permit MD0021555 · Major POTW · administratively continued, expires 2023-04-30 · 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.

This permit expired on 2023-04-30 and is administratively continued: its last limits keep applying until a new permit is issued, and EPA still expects the reports.

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

4values over a limit
0required values missing, on 0 form(s)
0of 22 forms filed late

Last period with anything received: 2026-07-31. Most often over: Phosphorus, total [as P] (2), Chlorine, total residual (1), Toxicity, Chronic (1).

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 (105)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]INST MIN >= 5 mg/L all year
001Oxygen, dissolved [DO]MN WK AV > 6 mg/L Feb, Mar, Apr, May
001BOD, 5-day, 20 deg. CMX MO AV <= 10 mg/L all year
001BOD, 5-day, 20 deg. CMX WK AV <= 15 mg/L all year
001BOD, 5-day, 20 deg. CMX MO AV <= 11000 lb/d all year
001BOD, 5-day, 20 deg. CMX WK AV <= 16000 lb/d all year
001pHMINIMUM >= 6.5 SU all year
001pHMAXIMUM <= 8.5 SU all year
001Solids, total suspendedMX MO AV <= 10 mg/L all year
001Solids, total suspendedMX WK AV <= 15 mg/L all year
001Solids, total suspendedMX MO AV <= 11000 lb/d all year
001Solids, total suspendedMO TOTAL report only all year
001Solids, total suspendedMX WK AV <= 16000 lb/d all year
001Solids, total suspendedCUM TOTL <= 3959228 lb/yr all year
001Nitrogen, total [as N]MO AVG report only all year
001Nitrogen, total [as N]CUM TOTL <= 1582055 lb/yr all year
001Nitrogen, total [as N]MO TOTAL <= 99782 lb/mo May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, total [as N]ANNL TOT report only Dec
001Nitrogen, total [as N]MO TOTAL report only Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, organic total [as N]MO AVG report only all year
001Nitrogen, ammonia total [as N]MX MO AV <= 5.1 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, ammonia total [as N]MX MO AV <= 2 mg/L May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MX WK AV <= 3 mg/L May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MX MO AV <= 5229 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, ammonia total [as N]MX MO AV <= 2200 lb/d May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MX WK AV <= 3300 lb/d May, Jun, Jul, Aug, Sep, Oct
001Nitrite + Nitrate total [as N]MO AVG report only all year
001Phosphorus, total [as P]MX MO AV <= .2 mg/L all year
001Phosphorus, total [as P]MX WK AV <= .3 mg/L all year
001Phosphorus, total [as P]MX MO AV <= 220 lb/d all year
001Phosphorus, total [as P]MO TOTAL report only Jan, Feb, Mar, Apr, Nov, Dec
001Phosphorus, total [as P]MX WK AV <= 330 lb/d all year
001Phosphorus, total [as P]ANNL TOT report only Mar, Jun, Sep, Dec
001Phosphorus, total [as P]CUM TOTL <= 79277 lb/yr all year
001Phosphorus, total [as P]MO TOTAL <= 6652 lb/mo May, Jun, Jul, Aug, Sep, Oct
001Cyanide, free [amenable to chlorination]MO AVG report only all year
001Phosphate, ortho [as P]MO AVG report only all year
001Chlordane [tech mix. and metabolites]TOTAL report only all year
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 residualMAXIMUM <= .1 mg/L all year
001E. coliGX <= 126 MPN/100mL all year
001Chromium, hexavalent tot recoverableVALUE report only all year
001Polychlorinated biphenyls [PCB] pg/LQRTR AVG report only Mar, Jun, Sep, Dec
001Polychlorinated biphenyls [PCB] pg/LANNL AVG report only Mar, Jun, Sep, Dec
001Polychlorinated biphenyls [PCB] pg/LQRTR AVG report only Mar, Jun, Sep, Dec
001Polychlorinated biphenyls [PCB] pg/LANNL MAX report only Mar, Jun, Sep, Dec
001Flow, totalANNL TOT report only Mar, Jun, Sep, Dec
001Flow, totalTOTAL report only all year
001Toxicity, AcuteMAXIMUM < 1 tox acute Mar, Jun, Sep, Dec
001Toxicity, ChronicMAXIMUM < 1.02 tox chronic Mar, Jun, Sep, Dec
002Oxygen, dissolved [DO]INST MIN >= 5 mg/L all year
002Oxygen, dissolved [DO]MN WK AV >= 6 mg/L Feb, Mar, Apr, May
002BOD, 5-day, 20 deg. CMX MO AV <= 20 mg/L May, Jun, Jul, Aug, Sep, Oct
002BOD, 5-day, 20 deg. CMX MO AV <= 30 mg/L Jan, Feb, Mar, Apr, Nov, Dec
002BOD, 5-day, 20 deg. CMX WK AV <= 30 mg/L May, Jun, Jul, Aug, Sep, Oct
002BOD, 5-day, 20 deg. CMX WK AV <= 45 mg/L Jan, Feb, Mar, Apr, Nov, Dec
002BOD, 5-day, 20 deg. CMX MO AV <= 8340 lb/d May, Jun, Jul, Aug, Sep, Oct
002BOD, 5-day, 20 deg. CMX MO AV <= 12520 lb/d Jan, Feb, Mar, Apr, Nov, Dec
002BOD, 5-day, 20 deg. CMX WK AV <= 12520 lb/d May, Jun, Jul, Aug, Sep, Oct
002BOD, 5-day, 20 deg. CMX WK AV <= 18770 lb/d Jan, Feb, Mar, Apr, Nov, Dec
002pHMINIMUM >= 6.5 SU all year
002pHMAXIMUM <= 8.5 SU all year
002Solids, total suspendedMX MO AV <= 30 mg/L all year
002Solids, total suspendedMX WK AV <= 45 mg/L all year
002Solids, total suspendedMX MO AV <= 12520 lb/d all year
002Solids, total suspendedMO TOTAL report only all year
002Solids, total suspendedMX WK AV <= 18770 lb/d all year
002Solids, total suspendedCUM TOTL <= 4589026 lb/yr all year
002Nitrogen, total [as N]MO AVG report only all year
002Nitrogen, total [as N]TC <= 230294 lb/yr May, Jun, Jul, Aug, Sep, Oct
002Nitrogen, total [as N]CUM TOTL <= 610748 lb/yr all year
002Nitrogen, total [as N]MO TOTAL report only all year
002Nitrogen, organic total [as N]MO AVG report only all year
002Nitrogen, organic total [as N]MY report only all year
002Nitrogen, ammonia total [as N]MX MO AV <= 5.1 mg/L Jan, Feb, Mar, Apr, Nov, Dec
002Nitrogen, ammonia total [as N]MX MO AV <= 2 mg/L May, Jun, Jul, Aug, Sep, Oct
002Nitrogen, ammonia total [as N]MX WK AV <= 3 mg/L May, Jun, Jul, Aug, Sep, Oct
002Nitrogen, ammonia total [as N]MX MO AV <= 2130 lb/d Jan, Feb, Mar, Apr, Nov, Dec
002Nitrogen, ammonia total [as N]MX MO AV <= 830 lb/d May, Jun, Jul, Aug, Sep, Oct
002Nitrogen, ammonia total [as N]MX WK AV <= 1250 lb/d May, Jun, Jul, Aug, Sep, Oct
002Nitrite + Nitrate total [as N]MO AVG report only all year
002Nitrite + Nitrate total [as N]MY report only all year
002Phosphorus, total [as P]MO AVG <= .2 mg/L all year
002Phosphorus, total [as P]WKLY AVG <= .3 mg/L all year
002Phosphorus, total [as P]MO AVG <= 83 lb/d all year
002Phosphorus, total [as P]TOTAL report only all year
002Phosphorus, total [as P]CUM TOTL <= 30363 lb/yr all year
002Phosphorus, total [as P]WKLY AVG <= 125 lb/d all year
002Phosphorus, total [as P]TC <= 15353 lb/yr May, Jun, Jul, Aug, Sep, Oct
002Cyanide, free [amenable to chlorination]MO AVG report only all year
002Phosphate, ortho [as P]MO AVG report only all year
002Phosphate, ortho [as P]MY report only all year
002Chlordane [tech mix. and metabolites]TOTAL report only all year
002EndrinTOTAL report only all year
002Flow, in conduit or thru treatment plantMO AVG report only all year
002Flow, in conduit or thru treatment plantDAILY MX report only all year
002Chlorine, total residualMAXIMUM report only all year
002E. coliGX <= 126 MPN/100mL all year
002Chromium, hexavalent tot recoverableMO AVG report only Mar, Jun, Sep, Dec
002Polychlorinated biphenyls [PCB] pg/LQRTR AVG report only Mar, Jun, Sep, Dec
002Polychlorinated biphenyls [PCB] pg/LANNL AVG report only Mar, Jun, Sep, Dec
002Polychlorinated biphenyls [PCB] pg/LQRTR AVG report only Mar, Jun, Sep, Dec
002Polychlorinated biphenyls [PCB] pg/LANNL TOT report only Mar, Jun, Sep, Dec
002Flow, totalTOTAL 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