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Great Falls Town of

Sewage treatment plant, major discharger, Great Falls, South Carolina. NPDES permit SC0021211, in force until Oct 31, 2029. Last 12 months: over a limit 2 times (last March 2026), 62 required values missing, 4 of 17 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form 1 monthly (31 values), form 2 quarterly (8 values), form 3 twice a year, form 4 yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
3 values over a limit, 31 required values missing, 5 of 19 reports late

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

Period endingParameterReportedLimitOver by
March 2026Solids, total suspended, weekly average49.3≤ 45 mg/L10%
March 2026Solids, total suspended, weekly average49.3≤ 45 mg/L10%

Limits in force (47)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]minimum≥ 5 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≤ 350 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 525 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≤ 350 lb/dall year
Solids, total suspendedweekly average≤ 525 lb/dall year
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, total [as N]weekly averagereport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (lb/d)all year
Nitrogen, total [as N]weekly averagereport only (lb/d)all year
Phosphorus, total [as P]monthly average≤ 2 mg/Lall year
Phosphorus, total [as P]weekly average≤ 3 mg/Lall year
Phosphorus, total [as P]monthly average≤ 12 lb/dall year
Phosphorus, total [as P]weekly average≤ 18 lb/dall year
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
Lead, total [as Pb]monthly averagereport only (mg/L)all year
Lead, total [as Pb]daily maximumreport only (mg/L)all year
Lead, total [as Pb]monthly averagereport only (lb/d)all year
Lead, total [as Pb]daily maximumreport only (lb/d)all year
Polychlorinated biphenyls [PCBs]monthly averagereport only (mg/L)all year
Polychlorinated biphenyls [PCBs]daily maximumreport only (mg/L)all year
Polychlorinated biphenyls [PCBs]monthly averagereport only (lb/d)all year
Polychlorinated biphenyls [PCBs]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≤ .5 mg/Lall year
Chlorine, total residualdaily maximum≤ 1 mg/Lall year
Chlorine, total residualmonthly average≤ 5.8 lb/dall year
Chlorine, total residualdaily maximum≤ 11.7 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
LC50 Static 48Hr Acute Ceriodaphnia dubiadaily minimumreport only (%)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
IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubiadaily minimumreport only (%)all year

New limits from Oct 1, 2028

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Copper, total [as Cu], daily maximum2.46 mg/Lnew0 mg/L (3 values)0×
Copper, total [as Cu], daily maximum29 lb/dnew0 lb/d (3 values)0×
Copper, total [as Cu], monthly average1.9 mg/Lnew0 mg/L (3 values)0×
Copper, total [as Cu], monthly average22 lb/dnew0 lb/d (3 values)0×
Polychlorinated biphenyls [PCBs], daily maximum0.00033 lb/dnew——
Polychlorinated biphenyls [PCBs], daily maximum0.000028 mg/Lnew——
Polychlorinated biphenyls [PCBs], monthly average0.00016 lb/dnew——
Polychlorinated biphenyls [PCBs], monthly average0.000014 mg/Lnew——

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/SC0021211 · MCP: https://passage-data.com/mcp