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Renewable Water Resources

Sewage treatment plant, major discharger, Simpsonville, South Carolina. NPDES permit SC0040525 expired Dec 31, 2023; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 29 days after each period: form 1 monthly (28 values), form 2 quarterly (8 values), form 3 quarterly (2 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 0 of 20 reports late

Limits in force (42)

ParameterStatisticLimitMonths
Oxygen demand, ultimatemonthly average≤ 3655 lb/dall year
Oxygen, dissolved [DO]minimum≥ 6 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 22.5 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 33.25 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 2120 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 3180 lb/dall year
pHminimum≥ 6 SUall year
pHmaximum≤ 8.5 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 2827 lb/dall year
Solids, total suspendedweekly average≤ 4241 lb/dall year
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, total [as N]weekly averagereport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (lb/d)all year
Nitrogen, total [as N]weekly averagereport only (lb/d)all year
Nitrogen, ammonia total [as N]monthly average≤ 7.73 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 3.17 mg/LMar–Oct
Nitrogen, ammonia total [as N]weekly average≤ 11.6 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 4.75 mg/LMar–Oct
Nitrogen, ammonia total [as N]monthly average≤ 728 lb/dJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 299 lb/dMar–Oct
Nitrogen, ammonia total [as N]weekly average≤ 1092 lb/dJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 449 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
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantweekly averagereport only (MGD)all year
Chlorine, total residualmonthly average≤ .033 mg/Lall year
Chlorine, total residualdaily maximum≤ .057 mg/Lall year
Chlorine, total residualmonthly average≤ 3.11 lb/dall year
Chlorine, total residualdaily maximum≤ 5.37 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
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average≤ 25 %all year
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiadaily maximum≤ 40 %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/SC0040525 · MCP: https://passage-data.com/mcp