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Sullivans Island Town of

Sewage treatment plant, Sullivan's Island, South Carolina. NPDES permit SC0020052 expired Dec 31, 2023; 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 yearly
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 13 reports late

Limits in force (35)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]minimum≥ 4 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≤ 143 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 215 lb/dall year
pHminimum≥ 6.5 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≤ 143 lb/dall year
Solids, total suspendedweekly average≤ 215 lb/dall year
Nitrogen, ammonia total [as N]monthly average≤ 3.3 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 1.8 mg/LMar–Oct
Nitrogen, ammonia total [as N]weekly average≤ 4.95 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 2.7 mg/LMar–Oct
Nitrogen, ammonia total [as N]monthly average≤ 16 lb/dJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 9 lb/dMar–Oct
Nitrogen, ammonia total [as N]weekly average≤ 24 lb/dJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 14 lb/dMar–Oct
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≤ .035 mg/Lall year
Chlorine, total residualdaily maximum≤ .061 mg/Lall year
Chlorine, total residualmonthly average≤ .17 lb/dall year
Chlorine, total residualdaily maximum≤ .29 lb/dall year
Enterococci30-day geometric mean≤ 35 MPN/100mLall year
Enterococcidaily maximum≤ 501 MPN/100mLall year
Enterococci30-day geometric mean≤ 35 MPN/100mLall year
Enterococcidaily maximum≤ 800 MPN/100mLall year
Coliform, fecal generalmonthly averagereport only (#/100mL)all year
Coliform, fecal generaldaily maximumreport only (#/100mL)all year
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year
% Effect Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)monthly averagereport only (%)all year
% Effect Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)daily maximumreport 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/SC0020052 · MCP: https://passage-data.com/mcp