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Sewerage Systems, Columbia, South Carolina. NPDES permit SC0029483 expired Jun 30, 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 (35 values), form 2 quarterly (2 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 16 reports late

Limits in force (47)

ParameterStatisticLimitMonths
Oxygen demand, ultimatemonthly average≤ 427.7 lb/dMar–Oct
Oxygen demand, ultimatemonthly average≤ 833 lb/dJan, Feb, Nov, Dec
Oxygen demand, ultimatedaily maximum≤ 855.4 lb/dMar–Oct
Oxygen demand, ultimatedaily maximum≤ 1666 lb/dJan, Feb, Nov, Dec
Oxygen, dissolved [DO]minimum≥ 5 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 27 mg/LJan, Feb, Nov, Dec
BOD, 5-day, 20 deg. Cmonthly average≤ 16.8 mg/LMar–Oct
BOD, 5-day, 20 deg. Cdaily maximum≤ 54 mg/LJan, Feb, Nov, Dec
BOD, 5-day, 20 deg. Cdaily maximum≤ 33.6 mg/LMar–Oct
BOD, 5-day, 20 deg. Cmonthly average≤ 450 lb/dJan, Feb, Nov, Dec
BOD, 5-day, 20 deg. Cmonthly average≤ 280 lb/dMar–Oct
BOD, 5-day, 20 deg. Cdaily maximum≤ 901 lb/dJan, Feb, Nov, Dec
BOD, 5-day, 20 deg. Cdaily maximum≤ 560 lb/dMar–Oct
pHminimum≥ 6 SUall year
pHmaximum≤ 8.5 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendeddaily maximum≤ 60 mg/Lall year
Solids, total suspendedmonthly average≤ 500 lb/dall year
Solids, total suspendeddaily maximum≤ 1000 lb/dall year
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (lb/d)all year
Nitrogen, total [as N]daily maximumreport only (lb/d)all year
Nitrogen, ammonia total [as N]monthly average≤ 2.11 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 2.05 mg/LMar–Oct
Nitrogen, ammonia total [as N]daily maximum≤ 4.22 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 4.1 mg/LMar–Oct
Nitrogen, ammonia total [as N]monthly average≤ 35 lb/dJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 34 lb/dMar–Oct
Nitrogen, ammonia total [as N]daily maximum≤ 70 lb/dJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 68 lb/dMar–Oct
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (lb/d)all year
Phosphorus, total [as P]daily maximumreport only (lb/d)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualmonthly average≤ .011 mg/Lall year
Chlorine, total residualdaily maximum≤ .019 mg/Lall year
Chlorine, total residualmonthly average≤ .18 lb/dall year
Chlorine, total residualdaily maximum≤ .32 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
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average≤ 25 %all year
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiadaily 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/SC0029483 · MCP: https://passage-data.com/mcp