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Charles County Commissioners

Sewage treatment plant, Newburg, Maryland. NPDES permit MD0055557, in force until Jul 31, 2031. Last 12 months: over a limit 4 times (last April 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (17 values), outfall 101 form A quarterly, outfall 102 form A quarterly
Last report on file
August 2026
Oct 2024 – Sep 2025
4 values over a limit, 0 required values missing, 0 of 12 reports late

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

Period endingParameterReportedLimitOver by
April 2026Solids, total suspended, maximum monthly average50.88 mg/L≤ 30 mg/L70%
April 2026Solids, total suspended, maximum weekly average165 mg/L≤ 45 mg/L267%
April 2026Solids, total suspended, maximum weekly average46.79 lb/d≤ 26 lb/d80%
April 2026pH, maximum9.7 SU≤ 8.5 SU—

Limits in force (24)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]instantaneous minimum≥ 5 mg/Lall year001
Oxygen, dissolved [DO]minimum weekly average≥ 6 mg/LFeb–May001
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≤ 18 lb/dall year001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 26 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≤ 18 lb/dall year001
Solids, total suspendedmaximum weekly average≤ 26 lb/dall 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 residualmaximum≤ .1 mg/Lall year001
Coliform, fecal generalmonthly median≤ 14 MPN/100mLall year001
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year101
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year101
Solids, total suspendedmonthly averagereport only (mg/L)all year101
Solids, total suspendedmonthly averagereport only (mg/L)all year101
Coliform, fecal generalmaximum≤ 2.2 MPN/100mLMar, Jun, Sep, Dec102
Coliform, fecal generalmaximum≤ 2.2 MPN/100mLMar, Jun, Sep, Dec102

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/MD0055557 · MCP: https://passage-data.com/mcp