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Maryland Environmental Service

Sewerage Systems, Cheltenham, Maryland. NPDES permit MD0023931, in force until Sep 30, 2028. Last 12 months: over a limit 3 times (last August 2026), 1 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (24 values)
Renewal application due
Apr 3, 2028 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
7 values over a limit, 0 required values missing, 1 of 12 reports late

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

Period endingParameterReportedLimitOver by
June 2026Solids, suspended percent removal, minimum67 %≥ 85 %120%
July 2026BOD, 5-day, 20 deg. C, maximum monthly average11 mg/L≤ 10 mg/L10%
August 2026BOD, 5-day, 20 deg. C, maximum weekly average46 mg/L≤ 15 mg/L207%

Limits in force (32)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]instantaneous minimum≥ 5 mg/Lall year
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 10 mg/LApr–Oct
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 30 mg/LJan, Feb, Mar, Nov, Dec
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 15 mg/LApr–Oct
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 45 mg/LJan, Feb, Mar, Nov, Dec
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 6 lb/dApr–Oct
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 18 lb/dJan, Feb, Mar, Nov, Dec
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 9 lb/dApr–Oct
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 26 lb/dJan, Feb, Mar, Nov, Dec
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≤ 18 lb/dall year
Solids, total suspendedmonthly totalreport only (lb/mo)all year
Solids, total suspendedannual maximum≤ 8000 lb/yrall year
Solids, total suspendedmaximum weekly average≤ 26 lb/dall year
Nitrogen, ammonia total [as N]maximum monthly average≤ 1 mg/LApr–Oct
Nitrogen, ammonia total [as N]maximum monthly average≤ 2.9 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]maximum daily average≤ 7.7 mg/LApr–Oct
Nitrogen, ammonia total [as N]maximum daily average≤ 8.1 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]maximum monthly average≤ .6 lb/dApr–Oct
Nitrogen, ammonia total [as N]maximum monthly average≤ 1.7 lb/dJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]maximum daily average≤ 4.5 lb/dApr–Oct
Nitrogen, ammonia total [as N]maximum daily average≤ 4.7 lb/dJan, Feb, Mar, Nov, Dec
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. colimonthly geometric mean≤ 126 MPN/100mLall year
Flow, totalmonthly totalreport only (Mgal)all year
BOD, 5-day, percent removalminimum≥ 85 %Mar, Jun, Sep, Dec
Solids, suspended percent removalminimum≥ 85 %Mar, Jun, Sep, Dec

How strict are these limits?

Cited limits by parameter: Maryland's rules and the federal ones.

Check this month's numbers Email me before each report is due

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Your permit document is the final word. As JSON: /api/v1/permits/MD0023931 · MCP: https://passage-data.com/mcp