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North Charleston Sewer District

Sewage treatment plant, major discharger, N Charleston, South Carolina. NPDES permit SC0024783 expired Aug 31, 2024; 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 (27 values), form 2 monthly (1 value), form 3 quarterly (4 values), form 4 yearly
Last report on file
September 2026
Oct 2024 – Sep 2025
2 values over a limit, 0 required values missing, 0 of 29 reports late

Limits in force (36)

ParameterStatisticLimitMonths
Oxygen demand, ultimatemonthly average≤ 29090 lb/dMar–Oct
Oxygen demand, ultimatemonthly average≤ 53595 lb/dJan, Feb, Nov, Dec
Oxygen demand, ultimateweekly average≤ 43635 lb/dMar–Oct
Oxygen demand, ultimateweekly average≤ 80393 lb/dJan, Feb, Nov, Dec
Oxygen, dissolved [DO]minimum≥ 1 mg/Lall year
Oxygen, dissolved [DO]monthly average minimum≥ 5 mg/Lall year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 8006 lb/dall year
Solids, total suspendedweekly average≤ 12010 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, 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
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
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
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall year
BOD, carbonaceous [5 day, 20 C]weekly average≤ 37.5 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 6672 lb/dall year
BOD, carbonaceous [5 day, 20 C]weekly average≤ 10008 lb/dall year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year
Carbonaceous oxygen demand, % removalmonthly average minimum≥ 85 %all year
% Effect Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)monthly average≤ 25 %all year
% Effect Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia)daily maximum≤ 40 %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/SC0024783 · MCP: https://passage-data.com/mcp