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Maryland Environmental Service

Sewage treatment plant, Grantsville, Maryland. NPDES permit MD0023981, in force until Sep 30, 2031. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 12 reports late

Limits in force (41)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)Apr–Oct001
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)Jan, Feb, Mar, Nov, Dec001
Temperature, water deg. fahrenheitmaximum daily averagereport only (deg F)Apr–Oct001
Temperature, water deg. fahrenheitmaximum daily averagereport only (deg F)Jan, Feb, Mar, Nov, Dec001
Oxygen, dissolved [DO]instantaneous minimum≥ 5 mg/Lall year001
Oxygen, dissolved [DO]daily average minimum≥ 6 mg/Lall year001
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 30 mg/LJan, Feb, Mar, Apr, May, Nov, Dec001
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 20 mg/LJun–Oct001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 45 mg/LJan, Feb, Mar, Apr, May, Nov, Dec001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 30 mg/LJun–Oct001
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 1.5 lb/dJan, Feb, Mar, Apr, May, Nov, Dec001
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 1 lb/dJun–Oct001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 2.3 lb/dJan, Feb, Mar, Apr, May, Nov, Dec001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 1.5 lb/dJun–Oct001
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≤ 1.5 lb/dall year001
Solids, total suspendedmaximum weekly average≤ 2.3 lb/dall year001
Nitrogen, ammonia total [as N]maximum monthly average≤ 16 mg/LJan, Feb, Mar, Apr, May, Nov, Dec001
Nitrogen, ammonia total [as N]maximum daily average≤ 19 mg/LJan, Feb, Mar, Apr, May, Nov, Dec001
Nitrogen, ammonia total [as N]maximum monthly average≤ .8 lb/dJan, Feb, Mar, Apr, May, Nov, Dec001
Nitrogen, ammonia total [as N]maximum daily average≤ 1 lb/dJan, Feb, Mar, Apr, May, Nov, Dec001
Nitrogen, Kjeldahl, total [as N]maximum monthly average≤ 7 mg/LJun–Oct001
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)Jan, Feb, Mar, Apr, May, Nov, Dec001
Nitrogen, Kjeldahl, total [as N]maximum weekly average≤ 11 mg/LJun–Oct001
Nitrogen, Kjeldahl, total [as N]weekly averagereport only (mg/L)Jan, Feb, Mar, Apr, May, Nov, Dec001
Nitrogen, Kjeldahl, total [as N]maximum monthly average≤ .4 lb/dJun–Oct001
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (lb/d)Jan, Feb, Mar, Apr, May, Nov, Dec001
Nitrogen, Kjeldahl, total [as N]maximum weekly average≤ .6 lb/dJun–Oct001
Nitrogen, Kjeldahl, total [as N]weekly averagereport only (lb/d)Jan, Feb, Mar, Apr, May, 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
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

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/MD0023981 · MCP: https://passage-data.com/mcp