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Aiken County Public Service Authority

Sewage treatment plant, major discharger, Beech Island, South Carolina. NPDES permit SC0024457, in force until Dec 31, 2030. 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 (37 values), form 2 quarterly (5 values), form 3 yearly
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 28 reports late

Limits in force (56)

ParameterStatisticLimitMonths
Oxygen demand, ultimatemonthly average≤ 6253 lb/dMar–Oct
Oxygen demand, ultimatemonthly average≤ 34449 lb/dJan, Feb, Nov, Dec
Oxygen demand, ultimateweekly averagereport only (lb/d)Mar–Oct
Oxygen demand, ultimateweekly averagereport only (lb/d)Jan, Feb, Nov, Dec
Oxygen, dissolved [DO]minimum≥ 4 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/LJan, Feb, Nov, Dec
BOD, 5-day, 20 deg. Cmonthly average≤ 10.4 mg/LMar–Oct
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/LJan, Feb, Nov, Dec
BOD, 5-day, 20 deg. Cweekly average≤ 15.5 mg/LMar–Oct
BOD, 5-day, 20 deg. Cmonthly average≤ 5004 lb/dJan, Feb, Nov, Dec
BOD, 5-day, 20 deg. Cmonthly average≤ 1727 lb/dMar–Oct
BOD, 5-day, 20 deg. Cweekly average≤ 7506 lb/dJan, Feb, Nov, Dec
BOD, 5-day, 20 deg. Cweekly average≤ 2591 lb/dMar–Oct
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≤ 5004 lb/dall year
Solids, total suspendedweekly average≤ 7506 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
Nitrogen, ammonia total [as N]monthly average≤ 11 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 8.2 mg/LMar–Oct
Nitrogen, ammonia total [as N]weekly average≤ 16.5 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 12.3 mg/LMar–Oct
Nitrogen, ammonia total [as N]monthly average≤ 1835 lb/dJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 1368 lb/dMar–Oct
Nitrogen, ammonia total [as N]weekly average≤ 2753 lb/dJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 2052 lb/dMar–Oct
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]weekly averagereport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (lb/d)all year
Phosphorus, total [as P]weekly averagereport 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≤ 83 lb/dall year
Chlorine, total residualdaily maximum≤ 167 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 (ng/L)all year
Mercury, total [as Hg]daily maximumreport only (ng/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≥ 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
Pass/Fail Static 48Hr Acute Ceriodaphnia dubiadaily maximum≤ 0 pass=0;fail=1all year
IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubiadaily minimumreport 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/SC0024457 · MCP: https://passage-data.com/mcp