Maryland Environmental Service

NPDES permit MD0023931 · Minor NON-POTW · effective, expires 2028-09-30 · 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.

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

2values over a limit
0required values missing, on 0 form(s)
0of 11 forms filed late

Last period with anything received: 2026-07-31. Most often over: Solids, suspended percent removal (1), BOD, 5-day, 20 deg. C (1).

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 (32)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]INST MIN >= 5 mg/L all year
001BOD, 5-day, 20 deg. CMX MO AV <= 10 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
001BOD, 5-day, 20 deg. CMX MO AV <= 30 mg/L Jan, Feb, Mar, Nov, Dec
001BOD, 5-day, 20 deg. CMX WK AV <= 15 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
001BOD, 5-day, 20 deg. CMX WK AV <= 45 mg/L Jan, Feb, Mar, Nov, Dec
001BOD, 5-day, 20 deg. CMX MO AV <= 6 lb/d Apr, May, Jun, Jul, Aug, Sep, Oct
001BOD, 5-day, 20 deg. CMX MO AV <= 18 lb/d Jan, Feb, Mar, Nov, Dec
001BOD, 5-day, 20 deg. CMX WK AV <= 9 lb/d Apr, May, Jun, Jul, Aug, Sep, Oct
001BOD, 5-day, 20 deg. CMX WK AV <= 26 lb/d Jan, Feb, Mar, 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 <= 18 lb/d all year
001Solids, total suspendedMO TOTAL report only all year
001Solids, total suspendedANNL MAX <= 8000 lb/yr all year
001Solids, total suspendedMX WK AV <= 26 lb/d all year
001Nitrogen, ammonia total [as N]MX MO AV <= 1 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MX MO AV <= 2.9 mg/L Jan, Feb, Mar, Nov, Dec
001Nitrogen, ammonia total [as N]MX DA AV <= 7.7 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MX DA AV <= 8.1 mg/L Jan, Feb, Mar, Nov, Dec
001Nitrogen, ammonia total [as N]MX MO AV <= .6 lb/d Apr, May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MX MO AV <= 1.7 lb/d Jan, Feb, Mar, Nov, Dec
001Nitrogen, ammonia total [as N]MX DA AV <= 4.5 lb/d Apr, May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MX DA AV <= 4.7 lb/d Jan, Feb, Mar, Nov, 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 residualMAXIMUM <= .1 mg/L all year
001E. coliMO GEOMN <= 126 MPN/100mL all year
001Flow, totalMO TOTAL report only all year
001BOD, 5-day, percent removalMINIMUM >= 85 % Mar, Jun, Sep, Dec
001Solids, suspended percent removalMINIMUM >= 85 % Mar, Jun, Sep, Dec

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