Washington County Department of Water Quality

NPDES permit MD0063509 · Major POTW · effective, expires 2031-05-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file

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

0values over a limit
0required values missing, on 0 form(s)
0of 23 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 (71)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]INST MIN >= 5 mg/L all year
001BOD, 5-day, 20 deg. CMX MO AV <= 27 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001BOD, 5-day, 20 deg. CMX MO AV <= 18 mg/L May, Jun, Jul, Aug, Sep, Oct
001BOD, 5-day, 20 deg. CMX WK AV <= 41 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001BOD, 5-day, 20 deg. CMX WK AV <= 27 mg/L May, Jun, Jul, Aug, Sep, Oct
001BOD, 5-day, 20 deg. CMX MO AV <= 1026 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001BOD, 5-day, 20 deg. CMX MO AV <= 684 lb/d May, Jun, Jul, Aug, Sep, Oct
001BOD, 5-day, 20 deg. CMX WK AV <= 1540 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001BOD, 5-day, 20 deg. CMX WK AV <= 1026 lb/d May, Jun, Jul, Aug, Sep, Oct
001pHMINIMUM >= 6.5 SU all year
001pHMAXIMUM <= 8.5 SU all year
001Solids, total suspendedMX MO AV <= 27 mg/L all year
001Solids, total suspendedMX WK AV <= 41 mg/L all year
001Solids, total suspendedMX MO AV <= 1026 lb/d all year
001Solids, total suspendedMX WK AV <= 1540 lb/d all year
001Solids, total suspendedCUM TOTL <= 374604 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 <= 76674 lb/yr all year
001Nitrogen, total [as N]MO TOTAL report only all year
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 <= 4.6 mg/L May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MX MO AV <= 10.7 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, ammonia total [as N]MX DA AV <= 16.5 mg/L May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MX DA AV <= 19.4 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, ammonia total [as N]MX MO AV <= 172 lb/d May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MX MO AV <= 403 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, ammonia total [as N]MX DA AV <= 621 lb/d May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MX DA AV <= 727 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 <= 3758 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
001Phosphate, ortho [as P]MO AVG report only all year
001Benzo[a]pyreneMAXIMUM report only Mar, Jun, Sep, Dec
001N-Nitrosodimethylamine [NDMA]MAXIMUM report only Mar, Jun, Sep, Dec
001Dibenz[a,h]anthraceneMAXIMUM report only Mar, Jun, Sep, Dec
001BenzidineMAXIMUM report only Mar, Jun, Sep, Dec
0014,4'-DDTMAXIMUM report only Mar, Jun, Sep, Dec
001AldrinMAXIMUM report only Mar, Jun, Sep, Dec
001Chlordane [tech mix. and metabolites]MAXIMUM report only Mar, Jun, Sep, Dec
001DieldrinMAXIMUM report only Mar, Jun, Sep, Dec
001ToxapheneMAXIMUM report only Mar, Jun, Sep, Dec
001HeptachlorMAXIMUM report only Mar, Jun, Sep, Dec
001HexachlorobenzeneMAXIMUM 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 residualDAILY MX <= .057 mg/L all year
001E. coliGX <= 115 MPN/100mL 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 all year
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 suspendedCUM TOTL report only all year
TRADSolids, total suspendedCUM TOTL report only all year
TRADNitrogen, total [as N]CUM TOTL report only all year
TRADNitrogen, total [as N]CUM TOTL report only all year
TRADPhosphorus, total [as P]CUM TOTL report only all year
TRADPhosphorus, total [as P]CUM TOTL 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