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Maryland Environmental Service

Sewage treatment plant, Hancock, Maryland. NPDES permit MD0062821, in force until Aug 31, 2031. Last 12 months: over a limit once (last March 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (21 values), outfall 101 form A yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 0 of 12 reports late

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

Period endingParameterReportedLimitOver by
March 2026BOD, 5-day, 20 deg. C, maximum weekly average14.5 mg/L≤ 8 mg/L81%

Limits in force (29)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]instantaneous minimum≥ 5 mg/Lall year001
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 5 mg/Lall year001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 8 mg/Lall year001
BOD, 5-day, 20 deg. Cmaximum monthly average≤ .52 lb/dall year001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ .83 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≤ 3.1 lb/dall year001
Solids, total suspendedmaximum weekly average≤ 4.7 lb/dall year001
Nitrogen, ammonia total [as N]maximum monthly average≤ .68 mg/LJun–Sep001
Nitrogen, ammonia total [as N]maximum monthly average≤ 8.9 mg/LJan, Feb, Mar, Apr, May, Oct, Nov, Dec001
Nitrogen, ammonia total [as N]maximum daily average≤ 4.8 mg/LJun–Sep001
Nitrogen, ammonia total [as N]maximum daily average≤ 15 mg/LJan, Feb, Mar, Apr, May, Oct, Nov, Dec001
Nitrogen, ammonia total [as N]maximum monthly average≤ .07 lb/dJun–Sep001
Nitrogen, ammonia total [as N]maximum monthly average≤ .93 lb/dJan, Feb, Mar, Apr, May, Oct, Nov, Dec001
Nitrogen, ammonia total [as N]maximum daily average≤ .5 lb/dJun–Sep001
Nitrogen, ammonia total [as N]maximum daily average≤ 1.6 lb/dJan, Feb, Mar, Apr, May, Oct, Nov, 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< .011 mg/Lall year001
E. colimaximum monthly geometric mean≤ 126 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

New limits from Sep 1, 2028

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Nitrogen, ammonia total [as N], maximum monthly average0.03 lb/d (Jun–Sep)tighter0.01 lb/d (3 values)0.333×
Nitrogen, ammonia total [as N], maximum monthly average0.32 mg/L (Jun–Sep)tighter0.11 mg/L (3 values)0.344×
Nitrogen, ammonia total [as N], maximum monthly average0.43 lb/d (Jan, Feb, Mar, Apr, May, Oct, Nov, Dec)tighter0 lb/d (8 values)0×
Nitrogen, ammonia total [as N], maximum monthly average4.1 mg/L (Jan, Feb, Mar, Apr, May, Oct, Nov, Dec)tighter0.065 mg/L (8 values)0.0159×
Nitrogen, ammonia total [as N], maximum daily average0.14 lb/d (Jun–Sep)tighter0.01 lb/d (3 values)0.0714×
Nitrogen, ammonia total [as N], maximum daily average1.3 mg/L (Jun–Sep)tighter0.24 mg/L (3 values)0.185×
Nitrogen, ammonia total [as N], maximum daily average0.91 lb/d (Jan, Feb, Mar, Apr, May, Oct, Nov, Dec)tighter0.005 lb/d (8 values)0.00549×
Nitrogen, ammonia total [as N], maximum daily average8.7 mg/L (Jan, Feb, Mar, Apr, May, Oct, Nov, Dec)tighter0.165 mg/L (8 values)0.019×

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/MD0062821 · MCP: https://passage-data.com/mcp