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Dorchester County Water and Sewer Department

Sewage treatment plant, major discharger, St. George, South Carolina. NPDES permit SC0025844 expired Sep 30, 2026; 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 (29 values), form 2 quarterly (2 values), form 3 yearly (2 values), form 4 quarterly (4 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 21 reports late

Limits in force (41)

ParameterStatisticLimitMonths
Oxygen demand, ultimatemonthly average≤ 131 lb/dall year
Oxygen demand, ultimateweekly average≤ 197 lb/dall year
Oxygen, dissolved [DO]minimum≥ 6 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 5.5 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 8.25 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 83 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 125 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≤ 450 lb/dall year
Solids, total suspendedweekly average≤ 675 lb/dall year
Nitrogen, ammonia total [as N]monthly average≤ 1 mg/LMar–Oct
Nitrogen, ammonia total [as N]monthly average≤ 2 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 1.5 mg/LMar–Oct
Nitrogen, ammonia total [as N]weekly average≤ 3 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 15 lb/dMar–Oct
Nitrogen, ammonia total [as N]monthly average≤ 30 lb/dJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 23 lb/dMar–Oct
Nitrogen, ammonia total [as N]weekly average≤ 45 lb/dJan, 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
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≤ .17 lb/dall year
Chlorine, total residualdaily maximum≤ .29 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
Mercury, total [as Hg]monthly averagereport only (mg/L)all year
Mercury, total [as Hg]daily maximumreport only (mg/L)all 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≤ 40 %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/SC0025844 · MCP: https://passage-data.com/mcp