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Williamsburg County Water & Sewer Authority/South

Sewage treatment plant, Greeleyville, South Carolina. NPDES permit SC0048097 expired Aug 31, 2020; its limits still apply. Last 12 months: over a limit 3 times (last February 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 29 days after each period: form 1 monthly (27 values), form 2 yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 13 reports late

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

Period endingParameterReportedLimitOver by
October 2025Carbonaceous oxygen demand, % removal, monthly average minimum< 91≥ 65 %—
December 2025Carbonaceous oxygen demand, % removal, monthly average minimum< 82≥ 65 %—
February 2026E. coli, daily maximum530≤ 349 MPN/100mL52%

Limits in force (35)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]minimum≥ 2 mg/Lall year
pHminimum≥ 6 SUall year
pHmaximum≤ 8.5 SUall year
Solids, total suspendedmonthly average≤ 90 mg/Lall year
Solids, total suspendedweekly average≤ 135 mg/Lall year
Solids, total suspendedmonthly average≤ 450 lb/dall year
Solids, total suspendedweekly average≤ 675 lb/dall 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≤ 100 lb/dall year
Nitrogen, ammonia total [as N]weekly average≤ 150 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≤ 2.5 lb/dall year
Chlorine, total residualdaily maximum≤ 5 lb/dall year
E. colimonthly average≤ 126 MPN/100mLall year
E. coli30-day geometric mean≤ 126 MPN/100mLall year
E. colidaily maximum≤ 349 MPN/100mLall year
E. colidaily maximum≤ 349 MPN/100mLall year
E. colimonthly average≤ 126 MPN/100mLall year
E. coli30-day geometric mean≤ 126 MPN/100mLall year
E. colidaily maximum≤ 800 MPN/100mLall year
E. colidaily maximum≤ 800 MPN/100mLall year
Mercury, total [as Hg]monthly averagereport only (mg/L)all year
Mercury, total [as Hg]daily maximumreport only (mg/L)all year
Mercury, total [as Hg]monthly averagereport only (lb/d)all year
Mercury, total [as Hg]daily maximumreport only (lb/d)all year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall year
BOD, carbonaceous [5 day, 20 C]weekly average≤ 40 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 125 lb/dall year
BOD, carbonaceous [5 day, 20 C]weekly average≤ 188 lb/dall year
Solids, suspended percent removalmonthly average minimum≥ 65 %all year
Carbonaceous oxygen demand, % removalmonthly average minimum≥ 65 %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/SC0048097 · MCP: https://passage-data.com/mcp