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Calhoun Falls Town of

Sewage treatment plant, Calhoun Falls, South Carolina. NPDES permit SC0025721 expired Jul 31, 2018; its limits still apply. Last 12 months: over a limit 6 times (last May 2026), 24 required values missing, 2 of 19 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 29 days after each period: form 1 monthly (27 values), form 2 quarterly, form 3 quarterly
Last report on file
August 2026
Oct 2024 – Sep 2025
10 values over a limit, 24 required values missing, 2 of 20 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimitOver by
January 2026Solids, suspended percent removal, monthly average minimum82≥ 85 %20%
March 2026Chlorine, total residual, daily maximum.45≤ .019 mg/L2268%
March 2026Chlorine, total residual, daily maximum1.2≤ .15 lb/d700%
March 2026Chlorine, total residual, monthly average.11≤ .011 mg/L900%
March 2026Chlorine, total residual, monthly average.31≤ .09 lb/d244%
May 2026Nitrogen, ammonia total [as N], monthly average2.29≤ 2.1 mg/L9%

Limits in force (37)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]instantaneous minimum≥ 6 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 18 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 27 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 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≤ 238 lb/dall year
Solids, total suspendedweekly average≤ 357 lb/dall year
Nitrogen, ammonia total [as N]monthly average≤ 2.1 mg/LMar–Oct
Nitrogen, ammonia total [as N]monthly average≤ 4.4 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 3.2 mg/LMar–Oct
Nitrogen, ammonia total [as N]weekly average≤ 6.6 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 17 lb/dMar–Oct
Nitrogen, ammonia total [as N]monthly average≤ 35 lb/dJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 26 lb/dMar–Oct
Nitrogen, ammonia total [as N]weekly average≤ 53 lb/dJan, Feb, Nov, Dec
Di[2-ethylhexyl] phthalate [DEHP]monthly average≤ .0037 mg/Lall year
Di[2-ethylhexyl] phthalate [DEHP]daily maximum≤ .0054 mg/Lall year
Di[2-ethylhexyl] phthalate [DEHP]monthly average≤ .029 lb/dall year
Di[2-ethylhexyl] phthalate [DEHP]daily maximum≤ .043 lb/dall 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≤ .011 mg/Lall year
Chlorine, total residualdaily maximum≤ .019 mg/Lall year
Chlorine, total residualmonthly average≤ .09 lb/dall year
Chlorine, total residualdaily maximum≤ .15 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
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 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/SC0025721 · MCP: https://passage-data.com/mcp