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Caroline County Board of Education

Sewage treatment plant, Denton, Maryland. NPDES permit MD0023621 expired Feb 28, 2025; its limits still apply. Last 12 months: over a limit once (last August 2026), 132 required values missing, 11 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (16 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
2 values over a limit, 1 required value missing, 5 of 12 reports late

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

Period endingParameterReportedLimitOver by
August 2026E. coli, maximum monthly geometric mean162 MPN/100mL≤ 126 MPN/100mL29%

Limits in force (17)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]minimum 7-day average≥ 6 mg/LFeb–May
Oxygen, dissolved [DO]monthly average minimum≥ 5.5 mg/Lall year
Oxygen, dissolved [DO]instantaneous minimum≥ 5 mg/Lall year
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 4.3 lb/dall year
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 6.4 lb/dall year
pHminimum≥ 6.5 SUall year
pHmaximum≤ 8.5 SUall year
Solids, total suspendedmaximum monthly average≤ 30 mg/Lall year
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall year
Solids, total suspendedmaximum monthly average≤ 4.3 lb/dall year
Solids, total suspendedmaximum weekly average≤ 6.4 lb/dall year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualmaximum< .1 mg/Lall year
E. colimaximum monthly geometric mean≤ 126 MPN/100mLall year

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/MD0023621 · MCP: https://passage-data.com/mcp