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NPDES permit MD0020257 · Minor POTW · effective, expires 2030-02-28 · 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

10values over a limit
5required values missing, on 2 form(s)
2of 34 forms filed late

Last period with anything received: 2026-07-31. Most often over: Nitrogen, ammonia total [as N] (6), BOD, 5-day, 20 deg. C (4).

Reporting

Reports are due about 28 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (61)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]INST MIN >= 5 mg/L Jan, Feb, Mar, Apr, Oct, Nov, Dec
001Oxygen, dissolved [DO]INST MIN >= 7 mg/L May, Jun, Jul, Aug, Sep
001BOD, 5-day, 20 deg. CMX MO AV <= 12 mg/L May, Jun, Jul, Aug, Sep
001BOD, 5-day, 20 deg. CMX MO AV <= 30 mg/L Jan, Feb, Mar, Apr, Oct, Nov, Dec
001BOD, 5-day, 20 deg. CMX WK AV <= 18 mg/L May, Jun, Jul, Aug, Sep
001BOD, 5-day, 20 deg. CMX WK AV <= 45 mg/L Jan, Feb, Mar, Apr, Oct, Nov, Dec
001BOD, 5-day, 20 deg. CMX MO AV <= 75 lb/d May, Jun, Jul, Aug, Sep
001BOD, 5-day, 20 deg. CMX MO AV <= 188 lb/d Jan, Feb, Mar, Apr, Oct, Nov, Dec
001BOD, 5-day, 20 deg. CMX WK AV <= 113 lb/d May, Jun, Jul, Aug, Sep
001BOD, 5-day, 20 deg. CMX WK AV <= 282 lb/d Jan, Feb, Mar, Apr, Oct, Nov, Dec
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 <= 188 lb/d all year
001Solids, total suspendedANNL TOT report only Dec
001Solids, total suspendedMX WK AV <= 282 lb/d all year
001Solids, total suspendedCUM TOTL <= 68525 lb/yr all year
001Solids, total suspendedMO TOTAL report only all year
001Nitrogen, total [as N]MO AVG report only all year
001Nitrogen, total [as N]CUM TOTL <= 9137 lb/yr all year
001Nitrogen, total [as N]MO TOTAL report only all year
001Nitrogen, total [as N]ANNL TOT report only Dec
001Nitrogen, total [as N]ANNL TOT report only all year
001Nitrogen, total [as N]ANNL TOT report only all year
001Nitrogen, organic total [as N]MO AVG report only all year
001Nitrogen, ammonia total [as N]MX MO AV <= 2 mg/L May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MX MO AV <= 9 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 6.9 mg/L May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 12 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, ammonia total [as N]MX MO AV <= 13 lb/d May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MX MO AV <= 56 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 43 lb/d May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 75 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 <= 685 lb/yr all year
001Phosphorus, total [as P]ANNL TOT report only Dec
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
001Phosphate, ortho [as P]MO AVG 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 <= .02 mg/L all year
001E. coliGX <= 126 MPN/100mL all year
001BOD, 5-day, percent removalMINIMUM >= 85 % all year
001Solids, suspended percent removalMO AV MN >= 85 % all year
001Flow, totalTOTAL 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
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