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Harleyville Town of

Sewage treatment plant, Harleyville, South Carolina. NPDES permit SC0038504, in force until Dec 31, 2028. Last 12 months: over a limit 8 times (last August 2026), 1 required value missing, 2 of 14 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 30 days after each period: form 1 monthly (29 values), form 2 quarterly (8 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
15 values over a limit, 58 required values missing, 2 of 16 reports late

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

Period endingParameterReportedLimitOver by
November 2025E. coli, 30-day geometric mean252≤ 126 MPN/100mL100%
February 2026Nitrogen, ammonia total [as N], monthly average12.85≤ 3 lb/d328%
February 2026Nitrogen, ammonia total [as N], monthly average12.93≤ 2.1 mg/L516%
February 2026Nitrogen, ammonia total [as N], weekly average29.8≤ 3.15 mg/L846%
February 2026Nitrogen, ammonia total [as N], weekly average32.92≤ 5 lb/d558%
March 2026E. coli, daily maximum2420≤ 349 MPN/100mL593%
May 2026Oxygen, dissolved [DO], minimum5.71≥ 6 mg/L5%
August 2026Oxygen, dissolved [DO], minimum5.67≥ 6 mg/L6%

Limits in force (41)

ParameterStatisticLimitMonths
Oxygen demand, ultimatemonthly average≤ 26.95 lb/dall year
Oxygen demand, ultimateweekly average≤ 26.95 lb/dall year
Oxygen, dissolved [DO]minimum≥ 6 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 15 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 22.5 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 19 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 29 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≤ 38 lb/dall year
Solids, total suspendedweekly average≤ 57 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≤ 2.1 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 2.05 mg/LMar–Oct
Nitrogen, ammonia total [as N]weekly average≤ 3.15 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 3.07 mg/LMar–Oct
Nitrogen, ammonia total [as N]monthly average≤ 3 lb/dJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 3 lb/dMar–Oct
Nitrogen, ammonia total [as N]weekly average≤ 5 lb/dJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 5 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≤ .011 mg/Lall year
Chlorine, total residualdaily maximum≤ .019 mg/Lall year
Chlorine, total residualmonthly average≤ .014 lb/dall year
Chlorine, total residualdaily maximum≤ .021 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

New limits from Nov 1, 2028

ParameterNew limitNew or tighterMedian, last 12 months× new limit
BOD, 5-day, 20 deg. C, monthly average9.27 mg/Ltighter2 mg/L (11 values)0.216×
BOD, 5-day, 20 deg. C, monthly average17.4 lb/dtighter1.61 lb/d (11 values)0.0925×
BOD, 5-day, 20 deg. C, weekly average26 lb/dtighter2.19 lb/d (11 values)0.0842×
BOD, 5-day, 20 deg. C, weekly average14 mg/Ltighter2 mg/L (11 values)0.143×

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/SC0038504 · MCP: https://passage-data.com/mcp