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Ridgeway Town of

Sewage treatment plant, Ridgeway, South Carolina. NPDES permit SC0022900 expired Jul 31, 2024; its limits still apply. Last 12 months: over a limit 8 times (last July 2026). 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
September 2026
Oct 2024 – Sep 2025
11 values over a limit, 0 required values missing, 0 of 20 reports late

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

Period endingParameterReportedLimitOver by
October 2025%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia, monthly average32≤ 25 %28%
October 2025Copper, total [as Cu], monthly average.013≤ .01 mg/L30%
January 2026Copper, total [as Cu], daily maximum.016≤ .013 mg/L23%
January 2026Copper, total [as Cu], monthly average.016≤ .01 mg/L60%
April 2026Copper, total [as Cu], monthly average.013≤ .01 lb/d30%
April 2026Copper, total [as Cu], monthly average.013≤ .01 mg/L30%
July 2026Copper, total [as Cu], daily maximum.014≤ .013 mg/L8%
July 2026Copper, total [as Cu], monthly average.014≤ .01 mg/L40%

Limits in force (41)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]minimum≥ 5 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 20 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 20 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 30 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≤ 30 lb/dall year
Solids, total suspendedweekly average≤ 45 lb/dall year
Nitrogen, ammonia total [as N]monthly average≤ 2.24 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 2.13 mg/LMar–Oct
Nitrogen, ammonia total [as N]weekly average≤ 3.36 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 3.19 mg/LMar–Oct
Nitrogen, ammonia total [as N]monthly average≤ 2.24 lb/dJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 2.13 lb/dMar–Oct
Nitrogen, ammonia total [as N]weekly average≤ 3.36 lb/dJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 3.2 lb/dMar–Oct
Copper, total [as Cu]monthly average≤ .01 mg/Lall year
Copper, total [as Cu]daily maximum≤ .013 mg/Lall year
Copper, total [as Cu]monthly average≤ .01 lb/dall year
Copper, total [as Cu]daily maximum≤ .013 lb/dall year
Lead, total [as Pb]monthly average≤ .0037 mg/Lall year
Lead, total [as Pb]daily maximum≤ .095 mg/Lall year
Lead, total [as Pb]monthly average≤ .0037 lb/dall year
Lead, total [as Pb]daily maximum≤ .095 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≤ .02 mg/Lall year
Chlorine, total residualmonthly average≤ .011 lb/dall year
Chlorine, total residualdaily maximum≤ .02 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/SC0022900 · MCP: https://passage-data.com/mcp