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Barnwell City of

Sewage treatment plant, major discharger, Barnwell, South Carolina. NPDES permit SC0047872 expired Dec 31, 2019; its limits still apply. Last 12 months: over a limit once (last January 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 29 days after each period: form 1 monthly (33 values), form 2 quarterly (8 values), form 3 monthly (4 values), form 4 quarterly (2 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
2 values over a limit, 0 required values missing, 0 of 32 reports late

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

Period endingParameterReportedLimitOver by
January 2026Copper, total [as Cu], monthly average.0581≤ .046 mg/L26%

Limits in force (51)

ParameterStatisticLimitMonths
Oxygen demand, ultimatemonthly average≤ 1801 lb/dall year
Oxygen demand, ultimateweekly averagereport only (lb/d)all year
Oxygen, dissolved [DO]minimum≥ 5 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 27 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 40.5 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 676 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 1014 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≤ 751 lb/dall year
Solids, total suspendedweekly average≤ 1127 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/min)all year
Nitrogen, total [as N]weekly averagereport only (lb/min)all year
Nitrogen, ammonia total [as N]monthly average≤ 13.09 mg/LMar–Oct
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)Jan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 19.57 mg/LMar–Oct
Nitrogen, ammonia total [as N]weekly averagereport only (mg/L)Jan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 328 lb/dMar–Oct
Nitrogen, ammonia total [as N]monthly averagereport only (lb/d)Jan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 490 lb/dMar–Oct
Nitrogen, ammonia total [as N]weekly averagereport only (lb/d)Jan, Feb, Nov, Dec
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
Copper, total [as Cu]monthly average≤ .046 mg/Lall year
Copper, total [as Cu]daily maximum≤ .061 mg/Lall year
Copper, total [as Cu]monthly average≤ 1.051 lb/dall year
Copper, total [as Cu]daily maximum≤ 1.376 lb/dall year
Zinc, total [as Zn]monthly average≤ .713 mg/Lall year
Zinc, total [as Zn]daily maximum≤ .713 mg/Lall year
Zinc, total [as Zn]monthly average≤ 16.088 lb/dall year
Zinc, total [as Zn]daily maximum≤ 16.088 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≤ .062 mg/Lall year
Chlorine, total residualdaily maximum≤ .108 mg/Lall year
Chlorine, total residualmonthly average≤ 1.55 lb/dall year
Chlorine, total residualdaily maximum≤ 2.7 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/SC0047872 · MCP: https://passage-data.com/mcp