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Pamplico Town of

Sewage treatment plant, Pamplico, South Carolina. NPDES permit SC0021351 expired Dec 31, 2023; its limits still apply. Last 12 months: over a limit 26 times (last June 2026), 4 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 29 days after each period: form 1 monthly (29 values), form 2 quarterly (8 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
12 values over a limit, 0 required values missing, 0 of 16 reports late

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

All 26 values over a limit
Period endingParameterReportedLimitOver by
October 2025BOD, 5-day, percent removal, monthly average minimum< 41≥ 85 %—
October 2025E. coli, 30-day geometric mean> 177.37≤ 126 MPN/100mL—
October 2025E. coli, daily maximum> 2420≤ 349 MPN/100mL—
October 2025Oxygen demand, ultimate, monthly average165.59≤ 160 lb/d3%
October 2025Oxygen demand, ultimate, weekly average190.34≤ 160 lb/d19%
October 2025Oxygen, dissolved [DO], minimum3.24≥ 6 mg/L46%
November 2025BOD, 5-day, percent removal, monthly average minimum24≥ 85 %407%
November 2025Chlorine, total residual, monthly average.78≤ .5 mg/L56%
November 2025Chlorine, total residual, monthly average2.37≤ 1.25 lb/d90%
November 2025Solids, suspended percent removal, monthly average minimum28≥ 85 %380%
November 2025Solids, total suspended, monthly average118.56≤ 75 lb/d58%
November 2025Solids, total suspended, monthly average39≤ 30 mg/L30%
November 2025Solids, total suspended, weekly average118.56≤ 113 lb/d5%
December 2025BOD, 5-day, percent removal, monthly average minimum79≥ 85 %40%
December 2025Solids, suspended percent removal, monthly average minimum63≥ 85 %147%
January 2026E. coli, 30-day geometric mean> 341≤ 126 MPN/100mL—
January 2026E. coli, daily maximum> 2420≤ 349 MPN/100mL—
January 2026Oxygen demand, ultimate, monthly average169.3≤ 160 lb/d6%
January 2026Oxygen demand, ultimate, weekly average204.2≤ 160 lb/d28%
February 2026E. coli, 30-day geometric mean> 190.53≤ 126 MPN/100mL—
February 2026E. coli, daily maximum> 2420≤ 349 MPN/100mL—
February 2026Oxygen, dissolved [DO], minimum5.24≥ 6 mg/L13%
March 2026E. coli, daily maximum1414≤ 349 MPN/100mL305%
April 2026BOD, 5-day, percent removal, monthly average minimum82≥ 85 %20%
June 2026Nitrogen, ammonia total [as N], monthly average16.48≤ 13.4 mg/L23%
June 2026Nitrogen, ammonia total [as N], weekly average20.5≤ 20.1 mg/L2%

Limits in force (41)

ParameterStatisticLimitMonths
Oxygen demand, ultimatemonthly average≤ 160 lb/dall year
Oxygen demand, ultimateweekly average≤ 160 lb/dall year
Oxygen, dissolved [DO]minimum≥ 6 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≤ 75 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 113 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≤ 75 lb/dall year
Solids, total suspendedweekly average≤ 113 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)Jan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 13.4 mg/LMar–Oct
Nitrogen, ammonia total [as N]weekly averagereport only (mg/L)Jan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 20.1 mg/LMar–Oct
Nitrogen, ammonia total [as N]monthly averagereport only (lb/d)Jan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 33.5 lb/dMar–Oct
Nitrogen, ammonia total [as N]weekly averagereport only (lb/d)Jan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 50.3 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≤ .5 mg/Lall year
Chlorine, total residualdaily maximum≤ 1 mg/Lall year
Chlorine, total residualmonthly average≤ 1.25 lb/dall year
Chlorine, total residualdaily maximum≤ 2.5 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

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/SC0021351 · MCP: https://passage-data.com/mcp