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Aberdeen Proving Ground, Aberdeen Area WWTP

Federal facility (National Security), major discharger, Aberdeen, Maryland. NPDES permit MD0021237, in force until Aug 31, 2027. Last 12 months: over a limit 5 times (last March 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form B monthly (44 values), outfall 101 form A monthly (2 values), outfall TRAD form E monthly (7 values), outfall 001 form Z yearly
Renewal application due
Mar 4, 2027 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 37 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimitOver by
January 2026BOD, 5-day, 20 deg. C, maximum monthly average23 mg/L≤ 20 mg/L15%
February 2026BOD, 5-day, 20 deg. C, maximum monthly average20.62 mg/L≤ 20 mg/L3%
February 2026BOD, 5-day, 20 deg. C, maximum weekly average32.4 mg/L≤ 30 mg/L8%
March 2026BOD, 5-day, 20 deg. C, maximum monthly average22.16 mg/L≤ 20 mg/L11%
March 2026BOD, 5-day, 20 deg. C, maximum weekly average51.55 mg/L≤ 30 mg/L72%

Limits in force (64)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]instantaneous minimum≥ 5 mg/Lall year001
Oxygen, dissolved [DO]minimum 7-day average≥ 6 mg/LFeb–May001
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 20 mg/Lall year001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 280 lb/dall year001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 430 lb/dall year001
pHminimum≥ 6.5 SUall year001
pHmaximum≤ 8.5 SUall year001
Solids, total suspendedmaximum monthly average≤ 20 mg/Lall year001
Solids, total suspendedmaximum weekly average≤ 30 mg/Lall year001
Solids, total suspendedmaximum monthly average≤ 280 lb/dall year001
Solids, total suspendedmaximum weekly average≤ 430 lb/dall year001
Solids, total suspendedcumulative total≤ 103500 lb/yrall year001
Solids, total suspendedmonthly totalreport only (lb/mo)all year001
Nitrogen, total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, total [as N]annual totalreport only (lb/yr)all year001
Nitrogen, total [as N]annual totalreport only (lb/yr)all year001
Nitrogen, total [as N]monthly totalreport only (lb/mo)all year001
Nitrogen, total [as N]cumulative total≤ 20710 lb/yrall year001
Nitrogen, organic total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, ammonia total [as N]maximum monthly average≤ 2.9 mg/LMay–Oct001
Nitrogen, ammonia total [as N]maximum monthly average≤ 5.3 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]maximum daily average≤ 7 mg/LMay–Oct001
Nitrogen, ammonia total [as N]maximum daily average≤ 8.4 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]maximum monthly average≤ 40 lb/dMay–Oct001
Nitrogen, ammonia total [as N]maximum monthly average≤ 75 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]maximum daily average≤ 99 lb/dMay–Oct001
Nitrogen, ammonia total [as N]maximum daily average≤ 120 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year001
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]annual totalreport only (lb/yr)all year001
Phosphorus, total [as P]annual totalreport only (lb/yr)all year001
Phosphorus, total [as P]cumulative total≤ 1553 lb/yrall year001
Phosphorus, total [as P]monthly totalreport only (lb/mo)all year001
Cyanide, total [as CN]quarterly averagereport only (ug/L)Mar, Jun, Sep, Dec001
PCB, total, scan effluentquarterly averagereport only (ug/L)Mar, Jun, Sep, Dec001
Phosphate, ortho [as P]monthly averagereport only (mg/L)all year001
Benzidinequarterly averagereport only (ug/L)Mar, Jun, Sep, Dec001
4,4'-DDTquarterly averagereport only (ug/L)Mar, Jun, Sep, Dec001
Dieldrinquarterly averagereport only (ug/L)Mar, Jun, Sep, Dec001
Endrinquarterly averagereport only (ug/L)Mar, Jun, Sep, Dec001
Toxaphenequarterly averagereport only (ug/L)Mar, Jun, Sep, Dec001
Heptachlorquarterly averagereport only (ug/L)Mar, Jun, Sep, Dec001
Heptachlor epoxidequarterly averagereport only (ug/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
Chlorine, total residualmaximum≤ .1 mg/Lall year001
Chlordanequarterly averagereport only (ug/L)Mar, Jun, Sep, Dec001
Coliform, fecal generalmonthly median≤ 14 MPN/100mLall year001
BOD, 5-day, percent removalmonthly averagereport only (%)all year001
Solids, suspended percent removalmonthly averagereport only (%)all year001
Flow, totalannual totalreport only (Mgal/yr)all year001
Flow, totalannual totalreport only (Mgal/yr)all year001
Flow, totalmonthly totalreport only (Mgal/mo)all year001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year101
Solids, total suspendedmonthly averagereport only (mg/L)all year101
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.

Same industry: the 8 National Security and International Affairs permits in Maryland.

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MD0021237 · MCP: https://passage-data.com/mcp