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Somerset County Sanitary District, Inc.

Sewage treatment plant, major discharger, Princess Anne, Maryland. NPDES permit MD0020656, in force until Apr 30, 2027. Last 12 months: over a limit 7 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (43 values), outfall 101 form A monthly (2 values), outfall 001 form Z yearly
Renewal application due
Nov 1, 2026 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
3 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
February 2026Nitrogen, ammonia total [as N], maximum monthly average38.84 lb/d≤ 19.4 lb/d100%
February 2026Nitrogen, ammonia total [as N], maximum monthly average7.1 mg/L≤ 3.1 mg/L129%
February 2026Phosphorus, total [as P], maximum weekly average.47 mg/L≤ .45 mg/L4%
April 2026Phosphorus, total [as P], maximum weekly average.46 mg/L≤ .45 mg/L2%
July 2026Nitrogen, total [as N], maximum monthly average34.96 lb/d≤ 31 lb/d13%
July 2026Nitrogen, total [as N], maximum monthly average8.17 mg/L≤ 5 mg/L63%
July 2026Nitrogen, total [as N], monthly load1112.7 lb/mo≤ 946 lb/mo18%

Limits in force (66)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]instantaneous minimum≥ 5 mg/Lall year001
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 5 mg/LMay–Oct001
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 30 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 7.5 mg/LMay–Oct001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 45 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 31 lb/dMay–Oct001
BOD, 5-day, 20 deg. Cmaximum monthly average≤ 188 lb/dJan, Feb, Mar, Apr, Nov, Dec001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 47 lb/dMay–Oct001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 282 lb/dJan, Feb, Mar, Apr, Nov, Dec001
BOD, 5-day, 20 deg. Cmonthly total≤ 1576 lb/moMay–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≤ 188 lb/dall year001
Solids, total suspendedmaximum weekly average≤ 282 lb/dall year001
Solids, total suspendedcumulative total≤ 115122 lb/yrall year001
Solids, total suspendedmonthly loadreport only (lb/mo)all year001
Nitrogen, total [as N]maximum monthly average≤ 5 mg/LMay–Oct001
Nitrogen, total [as N]maximum monthly average≤ 31 lb/dMay–Oct001
Nitrogen, total [as N]cumulative total≤ 15350 lb/yrall year001
Nitrogen, total [as N]monthly load≤ 946 lb/moMay–Oct001
Nitrogen, total [as N]annual totalreport only (lb/yr)all year001
Nitrogen, total [as N]annual totalreport only (lb/yr)all year001
Nitrogen, total [as N]monthly averagereport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, total [as N]monthly loadreport only (lb/mo)Jan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, organic total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, ammonia total [as N]maximum 7-day average≤ 12.4 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 1.5 mg/LMay–Oct001
Nitrogen, ammonia total [as N]maximum monthly average≤ 3.1 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]maximum daily average≤ 10.2 mg/LMay–Oct001
Nitrogen, ammonia total [as N]maximum daily average≤ 63.8 lb/dMay–Oct001
Nitrogen, ammonia total [as N]maximum daily average≤ 77.6 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]maximum monthly average≤ 9.4 lb/dMay–Oct001
Nitrogen, ammonia total [as N]maximum monthly average≤ 19.4 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year001
Phosphorus, total [as P]maximum monthly average≤ .3 mg/Lall year001
Phosphorus, total [as P]maximum weekly average≤ .45 mg/Lall year001
Phosphorus, total [as P]maximum monthly average≤ 1.9 lb/dall year001
Phosphorus, total [as P]cumulative total≤ 685 lb/yrall year001
Phosphorus, total [as P]maximum weekly average≤ 2.8 lb/dall year001
Phosphorus, total [as P]monthly loadreport only (lb/mo)all year001
Phosphorus, total [as P]annual totalreport only (lb/yr)all year001
Phosphorus, total [as P]annual totalreport only (lb/yr)all year001
Cyanide, total [as CN]quarterly averagereport only (ug/L)Mar, Jun, Sep, Dec001
Cadmium, total [as Cd]quarterly averagereport only (ug/L)Mar, Jun, Sep, Dec001
Aluminum, total recoverablequarterly averagereport only (ug/L)Mar, Jun, Sep, Dec001
Lead, total recoverablequarterly averagereport only (ug/L)Mar, Jun, Sep, Dec001
Copper, total recoverablequarterly averagereport only (ug/L)Mar, Jun, Sep, Dec001
Phosphate, ortho [as P]monthly averagereport only (mg/L)all year001
4,4'-DDTsemi-annual averagereport only (ug/L)Jun, Dec001
Chlordane [tech mix. and metabolites]semi-annual averagereport only (ug/L)Jun, Dec001
Toxaphenesemi-annual averagereport only (ug/L)Jun, Dec001
Heptachlorsemi-annual averagereport only (ug/L)Jun, Dec001
Polychlorinated biphenyls [PCBs]semi-annual averagereport only (ug/L)Jun, 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≤ .1 mg/Lall year001
Coliform, fecal generalmonthly median≤ 14 MPN/100mLall year001
BOD, 5-day, percent removalminimum≥ 85 %all year001
Solids, suspended percent removalminimum≥ 85 %all year001
Flow, totalmonthly totalreport only (Mgal/mo)all year001
Flow, totalannual totalreport only (Mgal/yr)all year001
Flow, totalannual totalreport only (Mgal/yr)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.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MD0020656 · MCP: https://passage-data.com/mcp