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Millington WWTP

Sewage treatment plant, Millington, Maryland. NPDES permit MD0020435, in force until Mar 31, 2030. Last 12 months: over a limit 3 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (36 values), outfall 101 form A monthly (2 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 1 of 19 reports late

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

Period endingParameterReportedLimitOver by
December 2025Enterococci, maximum monthly geometric mean66.1 MPN/100mL≤ 57 MPN/100mL16%
July 2026Enterococci, maximum monthly geometric mean116.6 MPN/100mL≤ 57 MPN/100mL105%
August 2026Enterococci, maximum monthly geometric mean134.3 MPN/100mL≤ 57 MPN/100mL136%

Limits in force (39)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]instantaneous minimum≥ 5 mg/Lall year001
Oxygen, dissolved [DO]minimum weekly average≥ 6 mg/LFeb–May001
Oxygen, dissolved [DO]monthly average minimum≥ 5.5 mg/Lall year001
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 26 lb/dall year001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 39 lb/dall year001
pHminimum≥ 6.5 SUall year001
pHmaximum≤ 8.5 SUall year001
Solids, total suspendedmaximum monthly average≤ 30 mg/Lall year001
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall year001
Solids, total suspendedmaximum monthly average≤ 26 lb/dall year001
Solids, total suspendedmaximum weekly average≤ 39 lb/dall year001
Nitrogen, total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, total [as N]cumulative total≤ 5744 lb/yrall year001
Nitrogen, total [as N]cumulative totalreport only (lb/mo)all year001
Nitrogen, total [as N]EPA's "SEAS TDT"≤ 2896 lb/yrMay–Oct001
Nitrogen, organic total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, organic total [as N]monthly averagereport only (lb/d)all year001
Nitrogen, ammonia total [as N]maximum weekly averagereport only (mg/L)all year001
Nitrogen, Kjeldahl, total [as N]maximum monthly averagereport only (mg/L)all year001
Nitrogen, Kjeldahl, total [as N]maximum weekly averagereport only (mg/L)all year001
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year001
Nitrite + Nitrate total [as N]monthly averagereport only (lb/d)all year001
Phosphorus, total [as P]monthly averagereport only (mg/L)all year001
Phosphorus, total [as P]cumulative total≤ 957 lb/yrall year001
Phosphorus, total [as P]monthly totalreport only (lb/mo)all year001
Phosphorus, total [as P]EPA's "SEAS TDT"≤ 483 lb/yrMay–Oct001
Phosphate, ortho [as P]monthly averagereport only (mg/L)all year001
Phosphate, ortho [as P]monthly averagereport only (lb/d)all year001
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 residualdaily maximum< .1 mg/Lall year001
Enterococcimaximum monthly geometric mean≤ 57 MPN/100mLall year001
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %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

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/MD0020435 · MCP: https://passage-data.com/mcp