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(Unknown Permittee)

Sewerage Systems, Piedmont, South Carolina. NPDES permit SC0028673 expired Aug 31, 2021; its limits still apply. Last 12 months: over a limit 10 times (last May 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 29 days after each period: form 1 monthly (31 values), form 2 every 60 months
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 12 reports late

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

Period endingParameterReportedLimitOver by
November 2025BOD, 5-day, 20 deg. C, daily maximum216≤ 60 mg/L260%
November 2025BOD, 5-day, 20 deg. C, daily maximum81.06≤ 48 lb/d69%
November 2025BOD, 5-day, 20 deg. C, monthly average110.8≤ 30 mg/L269%
November 2025BOD, 5-day, 20 deg. C, monthly average40.5≤ 24 lb/d69%
January 2026BOD, 5-day, 20 deg. C, daily maximum63.1≤ 60 mg/L5%
February 2026BOD, 5-day, 20 deg. C, monthly average32.9≤ 30 mg/L10%
February 2026Chlorine, total residual, daily maximum.07≤ .022 mg/L218%
February 2026Chlorine, total residual, monthly average.035≤ .013 mg/L169%
February 2026E. coli, daily maximum2419≤ 349 MPN/100mL593%
May 2026Solids, total suspended, monthly average39.63≤ 30 mg/L32%

Limits in force (37)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]minimum≥ 5 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 60 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 24 lb/dall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 48 lb/dall year
pHminimum≥ 6 SUall year
pHmaximum≤ 8.5 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendeddaily maximum≤ 60 mg/Lall year
Solids, total suspendedmonthly average≤ 24 lb/dall year
Solids, total suspendeddaily maximum≤ 48 lb/dall year
Nitrogen, ammonia total [as N]monthly average≤ 2.48 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 2.38 mg/LMar–Oct
Nitrogen, ammonia total [as N]daily maximum≤ 4.96 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 4.76 mg/LMar–Oct
Nitrogen, ammonia total [as N]monthly average≤ 2 lb/dJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 2 lb/dMar–Oct
Nitrogen, ammonia total [as N]daily maximum≤ 4 lb/dJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 4 lb/dMar–Oct
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]weekly averagereport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (lb/d)all year
Phosphorus, total [as P]weekly averagereport only (lb/d)all year
Phosphorus, total [as P]weekly averagereport only (lb/d)all year
Phosphorus, total [as P]monthly average≤ 0 lb/dall year
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 residualmonthly average≤ .013 mg/Lall year
Chlorine, total residualdaily maximum≤ .022 mg/Lall year
Chlorine, total residualmonthly average≤ .01 lb/dall year
Chlorine, total residualdaily maximum≤ .02 lb/dall year
E. coli30-day geometric mean≤ 126 MPN/100mLall year
E. colidaily maximum≤ 349 MPN/100mLall year
E. coli30-day geometric mean≤ 126 MPN/100mLall year
E. colidaily maximum≤ 800 MPN/100mLall year
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly averagereport only (%)all year
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiadaily maximumreport only (%)all year

How strict are these limits?

Cited limits by parameter: South Carolina'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/SC0028673 · MCP: https://passage-data.com/mcp