WASHINGTON SUBURBAN SANITARY COMMISSION - WSSC

NPDES permit MD0021539 · Major POTW · effective, expires 2027-10-31 · 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)
12of 45 forms filed late

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

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 (77)

OutfallParameterStatisticLimitMonths
001BOD, 5-day, 20 deg. CMO AVG report only all year
001BOD, 5-day, 20 deg. CWKLY AVG report only all year
001BOD, 5-day, 20 deg. CMX MO AV <= 7510 lb/d all year
001BOD, 5-day, 20 deg. CMX WK AV <= 11270 lb/d all year
001Solids, total suspendedMO AVG report only all year
001Solids, total suspendedWKLY AVG report only all year
001Solids, total suspendedMX MO AV <= 7510 lb/d all year
001Solids, total suspendedMX WK AV <= 11270 lb/d all year
001Solids, total suspendedCUM TOTL <= 2741000 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]MO TOTAL report only all year
001Nitrogen, total [as N]CUM TOTL <= 365467 lb/yr 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]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]WKLY AVG report only all year
001Phosphorus, total [as P]MX MO AV <= 45 lb/d all year
001Phosphorus, total [as P]CUM TOTL <= 16446 lb/yr all year
001Phosphorus, total [as P]MO TOTAL report only all year
001Phosphorus, total [as P]ANNL TOT report only all year
001Phosphate, ortho [as P]MO AVG report only all year
001Polychlorinated biphenyls [PCBs]MO AVG report only all year
001Polychlorinated biphenyls [PCBs]MO AVG report only all year
001Polychlorinated biphenyls [PCBs]MO AVG report only all year
001Polychlorinated biphenyls [PCBs]CUM TOTL 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
001EnterococciMX <= 35 MPN/100mL all year
001Flow, totalMO TOTAL report only all year
001Flow, totalANNL TOT report only all year
002Solids, total suspendedMO AVG report only all year
002Solids, total suspendedWKLY AVG report only all year
002Solids, total suspendedMO AVG report only all year
002Solids, total suspendedWKLY AVG report only all year
002Nitrogen, total [as N]MO AVG report only all year
002Nitrogen, total [as N]WKLY AVG report only all year
002Phosphorus, total [as P]MO AVG report only all year
002Phosphorus, total [as P]WKLY AVG report only all year
002FlowMO AVG report only all year
002FlowDAILY MX report only all year
101Oxygen, dissolved [DO]INST MIN >= 5 mg/L all year
101Oxygen, dissolved [DO]MO AV MN >= 5.5 mg/L all year
101Oxygen, dissolved [DO]MN WK AV >= 6 mg/L Feb, Mar, Apr, May
101BOD, 5-day, 20 deg. CMO AVG <= 30 mg/L all year
101BOD, 5-day, 20 deg. CWKLY AVG <= 45 mg/L all year
101pHMINIMUM >= 6 SU all year
101pHMAXIMUM <= 8.5 SU all year
101Solids, total suspendedMO AVG <= 30 mg/L all year
101Solids, total suspendedWKLY AVG <= 45 mg/L all year
101Solids, total suspendedCUM TOTL report only all year
101Solids, total suspendedMO TOTAL report only all year
101Nitrogen, total [as N]MO AVG report only all year
101Nitrogen, total [as N]CUM TOTL report only all year
101Nitrogen, total [as N]MO TOTAL report only all year
101Nitrogen, organic total [as N]MO AVG report only all year
101Nitrogen, ammonia total [as N]MO AVG report only all year
101Nitrite + Nitrate total [as N]MO AVG report only all year
101Phosphorus, total [as P]MO AVG <= .18 mg/L all year
101Phosphorus, total [as P]MO TOTAL report only all year
101Phosphorus, total [as P]CUM TOTL report only all year
101Phosphate, ortho [as P]MO AVG report only all year
101Polychlorinated biphenyls [PCBs]MO AVG report only all year
101Flow, in conduit or thru treatment plantMO AVG report only all year
101Flow, in conduit or thru treatment plantDAILY MX report only all year
101Chlorine, total residualMAXIMUM < .1 mg/L all year
101E. coliGX <= 126 MPN/100mL all year
101Flow, totalMO TOTAL 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