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Chapin Town of

Sewage treatment plant, major discharger, Chapin, South Carolina. NPDES permit SC0040631 expired Jun 30, 2023; its limits still apply. Last 12 months: over a limit 2 times (last January 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 29 days after each period: form 1 monthly (37 values), form 3 quarterly
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 16 reports late

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

Period endingParameterReportedLimitOver by
January 2026E. coli, daily maximum2419.6≤ 349 MPN/100mL593%
January 2026Nitrogen, ammonia total [as N], weekly average37.6≤ 30 mg/L25%

Limits in force (43)

ParameterStatisticLimitMonths
Oxygen demand, ultimatemonthly averagereport only (lb/d)Jan, Feb, Nov, Dec
Oxygen demand, ultimatemonthly average≤ 2067.4 lb/dMar–Oct
Oxygen demand, ultimateweekly averagereport only (lb/d)Jan, Feb, Nov, Dec
Oxygen demand, ultimateweekly average≤ 3101.1 lb/dMar–Oct
Oxygen, dissolved [DO]minimum≥ 5 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 600 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 900 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≤ 600 lb/dall year
Solids, total suspendedweekly average≤ 900 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≤ 20 mg/Lall year
Nitrogen, ammonia total [as N]weekly average≤ 30 mg/Lall year
Nitrogen, ammonia total [as N]monthly average≤ 400 lb/dall year
Nitrogen, ammonia total [as N]weekly average≤ 600 lb/dall year
Phosphorus, total [as P]monthly average= 4.5 mg/Lall year
Phosphorus, total [as P]weekly average= 6.75 mg/Lall year
Phosphorus, total [as P]monthly average= 45 lb/dall year
Phosphorus, total [as P]weekly average= 67.5 lb/dall 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≤ .5 mg/Lall year
Chlorine, total residualdaily maximum≤ 1 mg/Lall year
Chlorine, total residualmonthly average≤ 10 lb/dall year
Chlorine, total residualdaily maximum≤ 20 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
LC50 Static 48Hr Acute Ceriodaphnia dubiadaily minimumreport only (%)all year
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average= 25 %all year
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiadaily maximum= 45 %all year
IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubiadaily minimumreport 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/SC0040631 · MCP: https://passage-data.com/mcp