Washington Suburban Sanitary Commission - WSSC

NPDES permit MD0020982 · Major POTW · effective, expires 2028-12-31 · 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)
10of 34 forms filed late

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

Reporting

Reports are due about 8 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (80)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]INST MIN >= 5 mg/L all year
001BOD, 5-day, 20 deg. CMX MO AV <= 15 mg/L May, Jun, Jul, Aug, Sep, Oct
001BOD, 5-day, 20 deg. CMX MO AV <= 30 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001BOD, 5-day, 20 deg. CMX WK AV <= 23 mg/L May, Jun, Jul, Aug, Sep, Oct
001BOD, 5-day, 20 deg. CMX WK AV <= 45 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001BOD, 5-day, 20 deg. CMX MO AV <= 188 lb/d May, Jun, Jul, Aug, Sep, Oct
001BOD, 5-day, 20 deg. CMX MO AV <= 376 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001BOD, 5-day, 20 deg. CMX WK AV <= 282 lb/d May, Jun, Jul, Aug, Sep, Oct
001BOD, 5-day, 20 deg. CMX WK AV <= 563 lb/d Jan, Feb, Mar, Apr, 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 <= 376 lb/d all year
001Solids, total suspendedMX WK AV <= 563 lb/d all year
001Solids, total suspendedCUM TOTL <= 136800 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 <= 18273 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, organic total [as N]MO AVG report only all year
001Nitrogen, ammonia total [as N]MX MO AV <= 2.1 mg/L May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MX MO AV <= 4.2 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, ammonia total [as N]MX MO AV <= 1.4 mg/L May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MX MO AV <= 2.8 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, ammonia total [as N]MX MO AV <= 26 lb/d May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MX MO AV <= 52 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, ammonia total [as N]MX MO AV <= 18 lb/d May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MX MO AV <= 35 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001Nitrogen, Kjeldahl, total [as N]MX MO AV <= 6 mg/L May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, Kjeldahl, total [as N]MX WK AV <= 9 mg/L May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, Kjeldahl, total [as N]MX MO AV <= 75 lb/d May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, Kjeldahl, total [as N]MX WK AV <= 113 lb/d May, Jun, Jul, Aug, Sep, Oct
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 <= 1371 lb/yr all year
001Phosphorus, total [as P]MO TOTAL report only all year
001Phosphorus, total [as P]ANNL TOT report only all year
001Hardness, total [as CaCO3]MO AVG report only all year
001Hardness, total [as CaCO3]MO AVG report only all year
001Copper, total recoverableMO AVG report only all year
001ArsenicQRTR AVG report only Mar, Jun, Sep, Dec
001Phosphate, ortho [as P]MO AVG report only all year
001AcrylonitrileQRTR AVG report only Mar, Jun, Sep, Dec
001Bis[2-chloroethyl] etherQRTR AVG report only Mar, Jun, Sep, Dec
001ChryseneQRTR AVG report only Mar, Jun, Sep, Dec
001N-Nitrosodi-N-propylamineQRTR AVG report only Mar, Jun, Sep, Dec
001N-Nitrosodimethylamine [NDMA]QRTR AVG report only Mar, Jun, Sep, Dec
001Benzo[a]anthraceneQRTR AVG report only Mar, Jun, Sep, Dec
001Dibenz[a,h]anthraceneQRTR AVG report only Mar, Jun, Sep, Dec
0013,3'-DichlorobenzidineQRTR AVG report only Mar, Jun, Sep, Dec
001BenzidineQRTR AVG report only Mar, Jun, Sep, Dec
0014,4'-DDTQRTR AVG report only Mar, Jun, Sep, Dec
0014,4'-DDDQRTR AVG report only Mar, Jun, Sep, Dec
0014,4'-DDEQRTR AVG report only Mar, Jun, Sep, Dec
001AldrinQRTR AVG report only Mar, Jun, Sep, Dec
001ToxapheneQRTR AVG report only Mar, Jun, Sep, Dec
001HeptachlorQRTR AVG report only Mar, Jun, Sep, Dec
001Heptachlor epoxideQRTR AVG report only Mar, Jun, Sep, Dec
001HexachlorobenzeneQRTR AVG 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 residualINST MAX <= .011 mg/L all year
001ChlordaneQRTR AVG report only Mar, Jun, Sep, Dec
001E. coliGX <= 126 MPN/100mL all year
001Polychlorinated biphenyls [PCB] pg/LQRTR AVG report only Mar, Jun, Sep, Dec
001BOD, 5-day, percent removalMO AV MN >= 85 % all year
001Solids, suspended percent removalMO AV MN >= 85 % all year
001Flow, totalMO TOTAL 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 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