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Johnsonville City of

Sewage treatment plant, major discharger, Johnsonville, South Carolina. NPDES permit SC0025933 expired Nov 30, 2022; 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 (23 values), form 2 monthly (6 values), form 3 quarterly
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 28 reports late

Limits in force (37)

ParameterStatisticLimitMonths
Oxygen demand, ultimatemonthly average≤ 6603 lb/dJan, Feb, Nov, Dec
Oxygen demand, ultimatemonthly average≤ 2224 lb/dMar–Oct
Oxygen demand, ultimateweekly averagereport only (lb/d)Jan, Feb, Nov, Dec
Oxygen demand, ultimateweekly averagereport only (lb/d)Mar–Oct
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≤ 1126 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 1689 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≤ 1126 lb/dall year
Solids, total suspendedweekly average≤ 1689 lb/dall year
Nitrogen, ammonia total [as N]monthly average≤ 12.3 mg/LMar–Oct
Nitrogen, ammonia total [as N]monthly average≤ 18.3 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 18.4 mg/LMar–Oct
Nitrogen, ammonia total [as N]weekly average≤ 27.5 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 462 lb/dMar–Oct
Nitrogen, ammonia total [as N]monthly average≤ 687 lb/dJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 691 lb/dMar–Oct
Nitrogen, ammonia total [as N]weekly average≤ 1032 lb/dJan, Feb, Nov, Dec
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≤ .22 mg/Lall year
Chlorine, total residualdaily maximum≤ .38 mg/Lall year
Chlorine, total residualmonthly average≤ 8.26 lb/dall year
Chlorine, total residualdaily maximum≤ 14.26 lb/dall year
E. coli30-day geometric mean≤ 126 MPN/100mLall year
E. colidaily maximum≤ 349 MPN/100mLall year
E. coli30-day geometric mean≤ 349 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≥ 74 %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

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/SC0025933 · MCP: https://passage-data.com/mcp