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Edgefield County Water & Sewer Authority

Sewage treatment plant, Johnston, South Carolina. NPDES permit SC0025691 expired Jul 31, 2021; its limits still apply. Last 12 months: no values over a limit, 4 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 29 days after each period: form 1 monthly (33 values), form 2 every 60 months
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 12 reports late

Limits in force (43)

ParameterStatisticLimitMonths
Oxygen demand, ultimatemonthly average≤ 418 lb/dall year
Oxygen demand, ultimateweekly average≤ 627 lb/dall year
Oxygen, dissolved [DO]minimum≥ 6 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 28 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 42 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 226 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 339 lb/dall year
pHminimum≥ 6 SUall year
pHmaximum≤ 8.5 SUall year
Solids, total suspendedmonthly average≤ 75 mg/Lall year
Solids, total suspendedweekly average≤ 112.5 mg/Lall year
Solids, total suspendedmonthly average≤ 605 lb/dall year
Solids, total suspendedweekly average≤ 908 lb/dall year
Nitrogen, ammonia total [as N]monthly average≤ 2.22 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 2.14 mg/LMar–Oct
Nitrogen, ammonia total [as N]weekly average≤ 3.33 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 3.21 mg/LMar–Oct
Nitrogen, ammonia total [as N]monthly average≤ 18 lb/dJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 17 lb/dMar–Oct
Nitrogen, ammonia total [as N]weekly average≤ 27 lb/dJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 26 lb/dMar–Oct
Copper, total [as Cu]monthly averagereport only (mg/L)all year
Copper, total [as Cu]daily maximumreport only (mg/L)all year
Copper, total [as Cu]monthly averagereport only (lb/d)all year
Copper, total [as Cu]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 plantweekly averagereport only (MGD)all year
Chlorine, total residualmonthly average≤ .012 mg/Lall year
Chlorine, total residualdaily maximum≤ .02 mg/Lall year
Chlorine, total residualmonthly average≤ .1 lb/dall year
Chlorine, total residualdaily maximum≤ .16 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
Mercury, total [as Hg]monthly averagereport only (mg/L)all year
Mercury, total [as Hg]daily maximumreport only (mg/L)all year
Mercury, total [as Hg]monthly averagereport only (lb/d)all year
Mercury, total [as Hg]daily maximumreport only (lb/d)all year
BOD, 5-day, percent removalmonthly average minimum≥ 65 %all year
Solids, suspended percent removalmonthly average minimum≥ 65 %all year
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly averagereport only (%)all year
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiadaily maximumreport only (%)all year

How strict are these limits?

Cited limits by parameter: South Carolina's rules and the federal ones.

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/SC0025691 · MCP: https://passage-data.com/mcp