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Maryland Environmental Service

Sewage treatment plant, Scotland, Maryland. NPDES permit MD0023949, in force until Aug 31, 2027. Last 12 months: over a limit 5 times (last August 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 monthly (2 values), outfall 001 form B yearly
Renewal application due
Mar 4, 2027 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
2 values over a limit, 0 required values missing, 0 of 25 reports late

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

Period endingParameterReportedLimitOver by
November 2025Solids, total suspended, maximum monthly average42 mg/L≤ 30 mg/L40%
July 2026BOD, 5-day, 20 deg. C, maximum weekly average57 mg/L≤ 45 mg/L27%
July 2026Coliform, fecal general, monthly median728 MPN/100mL≤ 14 MPN/100mL5100%
July 2026Solids, total suspended, maximum monthly average33 mg/L≤ 30 mg/L10%
August 2026Solids, total suspended, maximum weekly average59 mg/L≤ 45 mg/L31%

Limits in force (33)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]instantaneous minimum≥ 5 mg/Lall year001
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≤ 23 lb/dall year001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 34 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≤ 23 lb/dall year001
Solids, total suspendedmaximum weekly average≤ 34 lb/dall year001
Solids, total suspendedcumulative totalreport only (lb/yr)all year001
Solids, total suspendedcumulative totalreport only (lb/yr)all year001
Solids, total suspendedcumulative totalreport only (lb/yr)all year001
Solids, total suspendedcumulative totalreport only (lb/yr)all year001
Nitrogen, total [as N]cumulative totalreport only (lb/yr)all year001
Nitrogen, total [as N]cumulative totalreport only (lb/yr)all year001
Nitrogen, total [as N]cumulative totalreport only (lb/yr)all year001
Nitrogen, total [as N]cumulative totalreport only (lb/yr)all year001
Phosphorus, total [as P]cumulative totalreport only (lb/yr)all year001
Phosphorus, total [as P]cumulative totalreport only (lb/yr)all year001
Phosphorus, total [as P]cumulative totalreport only (lb/yr)all year001
Phosphorus, total [as P]cumulative totalreport only (lb/yr)all 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 residualdaily maximum≤ .1 mg/Lall year001
Coliform, fecal generalmonthly median≤ 14 MPN/100mLall year001
Flowyear-to-date totalreport only (Mgal/yr)all year001
Flowyear-to-date totalreport only (Mgal/yr)all year001
BOD, 5-day, percent removalminimum≥ 85 %all year001
Solids, suspended percent removalminimum≥ 85 %all year001
BOD, 5-day, 20 deg. Cmonthly 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.

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

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MD0023949 · MCP: https://passage-data.com/mcp