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Moncks Corner Town of

Sewage treatment plant, major discharger, Moncks Corner, South Carolina. NPDES permit SC0021598 expired Dec 31, 2025; its limits still apply. Last 12 months: over a limit 8 times (last June 2026), 1 of 16 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 29 days after each period: form 1 monthly (27 values), form 2 quarterly (8 values), form 3 yearly, form 4 yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
9 values over a limit, 0 required values missing, 0 of 18 reports late

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

Period endingParameterReportedLimitOver by
January 2026BOD, 5-day, 20 deg. C, monthly average39≤ 30 mg/L30%
February 2026BOD, 5-day, 20 deg. C, monthly average37≤ 30 mg/L23%
February 2026BOD, 5-day, 20 deg. C, weekly average46≤ 45 mg/L2%
March 2026BOD, 5-day, 20 deg. C, monthly average36≤ 30 mg/L20%
April 2026BOD, 5-day, 20 deg. C, monthly average36≤ 30 mg/L20%
April 2026E. coli, daily maximum> 2420≤ 349 #/100mL—
May 2026BOD, 5-day, 20 deg. C, monthly average32≤ 30 mg/L7%
June 2026E. coli, daily maximum> 2420≤ 349 #/100mL—

Limits in force (43)

ParameterStatisticLimitMonths
Oxygen demand, ultimatemonthly average≤ 5730 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≤ 30 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 801 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 1202 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≤ 801 lb/dall year
Solids, total suspendedweekly average≤ 1202 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 averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]weekly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]monthly averagereport only (lb/d)all year
Nitrogen, ammonia total [as N]weekly averagereport only (lb/d)all year
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 residualdaily maximum≤ .11 mg/Lall year
Chlorine, total residualdaily maximum≤ 2.94 lb/dall year
E. coli30-day geometric mean≤ 126 #/100mLall year
E. colidaily maximum≤ 349 #/100mLall year
E. coli30-day geometric mean≤ 126 #/100mLall year
E. colidaily maximum≤ 800 #/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, 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/SC0021598 · MCP: https://passage-data.com/mcp