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Washington Suburban Sanitary Commission - WSSC

Sewage treatment plant, major discharger, Germantown, Maryland. NPDES permit MD0021491 expired Apr 30, 2022; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (36 values), outfall TRAD form E monthly (7 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 1 required value missing, 1 of 24 reports late

Limits in force (54)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]instantaneous minimum≥ 5 mg/Lall year001
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 8 mg/LMay–Oct001
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 23 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 12 mg/LMay–Oct001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 35 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 1669 lb/dMay–Oct001
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 5007 lb/dJan, Feb, Mar, Apr, Nov, Dec001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 2504 lb/dMay–Oct001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 7511 lb/dJan, Feb, Mar, Apr, Nov, Dec001
pHminimum≥ 6.5 SUall year001
pHmaximum≤ 8.5 SUall year001
Solids, total suspendedmaximum monthly average≤ 23 mg/Lall year001
Solids, total suspendedmaximum weekly average≤ 35 mg/Lall year001
Solids, total suspendedmaximum monthly average≤ 5007 lb/dall year001
Solids, total suspendedmaximum weekly average≤ 7511 lb/dall year001
Solids, total suspendedmonthly totalreport only (lb/mo)all year001
Solids, total suspendedcumulative total≤ 1824000 lb/yrall year001
Nitrogen, total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, total [as N]cumulative total≤ 316738 lb/yrall year001
Nitrogen, total [as N]monthly totalreport only (lb/mo)all year001
Nitrogen, total [as N]annual totalreport only (lb/yr)Dec001
Nitrogen, organic total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, ammonia total [as N]maximum monthly average≤ 2.5 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]maximum monthly average≤ 1.5 mg/LMay–Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 6.7 mg/LMay–Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 7.2 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]maximum monthly average≤ 542 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]maximum monthly average≤ 325 lb/dMay–Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 1453 lb/dMay–Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 1561 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year001
Phosphorus, total [as P]monthly averagereport only (mg/L)all year001
Phosphorus, total [as P]monthly totalreport only (lb/mo)all year001
Phosphorus, total [as P]cumulative total≤ 21563 lb/yrall year001
Phosphorus, total [as P]annual totalreport only (lb/yr)Dec001
Hardness, total [as CaCO3]monthly averagereport only (mg/L)all year001
Hardness, total [as CaCO3]monthly averagereport only (mg/L)all year001
Selenium, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Sep, Dec001
Copper, total recoverablemonthly averagereport only (ug/L)all year001
Di[2-ethylhexyl] phthalate [DEHP]monthly averagereport only (mg/L)Mar, Jun, Sep, Dec001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Flow, in conduit or thru treatment plantannual totalreport only (Mgal/yr)Dec001
Chlorine, total residualmaximum daily average≤ .1 mg/Lall year001
E. colimonthly geometric mean≤ 126 MPN/100mLall year001
Phosphorous, in total orthophosphatemonthly averagereport only (mg/L)all year001
Flow, totalmonthly totalreport only (Mgal/mo)all year001
Solids, total suspendedcumulative totalreport only (lb/yr)all yearTRAD
Solids, total suspendedcumulative totalreport only (lb/yr)all yearTRAD
Nitrogen, total [as N]cumulative totalreport only (lb/yr)all yearTRAD
Nitrogen, total [as N]cumulative totalreport only (lb/yr)all yearTRAD
Phosphorus, total [as P]cumulative totalreport only (lb/yr)all yearTRAD
Phosphorus, total [as P]cumulative totalreport only (lb/yr)all yearTRAD
Flowyear-to-date totalreport only (Mgal/yr)all yearTRAD

How strict are these limits?

Cited limits by parameter: Maryland's rules and the federal ones.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MD0021491 · MCP: https://passage-data.com/mcp