Passage Data · Check a report · Use it from your AI

Chester Sewer District

Sewage treatment plant, major discharger, Chester, South Carolina. NPDES permit SC0036056 expired Jun 30, 2025; its limits still apply. Last 12 months: over a limit once (last December 2025), 6 of 28 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 29 days after each period: form 1 monthly (38 values), form 2 quarterly (2 values), form 3 quarterly (4 values), form 4 monthly (38 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 4 required values missing, 2 of 32 reports late

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

Period endingParameterReportedLimitOver by
December 2025BOD, 5-day, 20 deg. C, weekly average23.5≤ 15 mg/L57%

Limits in force (94)

ParameterStatisticLimitMonths
Oxygen demand, ultimatemonthly average≤ 263 lb/dMar–Oct
Oxygen demand, ultimatemonthly average≤ 281 lb/dJan, Feb, Nov, Dec
Oxygen demand, ultimatemonthly average= 263 lb/dMar–Oct
Oxygen demand, ultimatemonthly average= 281 lb/dJan, Feb, Nov, Dec
Oxygen demand, ultimateweekly average≤ 395 lb/dMar–Oct
Oxygen demand, ultimateweekly average≤ 422 lb/dJan, Feb, Nov, Dec
Oxygen demand, ultimateweekly average= 395 lb/dMar–Oct
Oxygen demand, ultimateweekly average= 422 lb/dJan, Feb, Nov, Dec
Oxygen, dissolved [DO]minimum≥ 6 mg/Lall year
Oxygen, dissolved [DO]minimum= 6 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average= 10 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 10 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average= 15 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 15 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average= 334 lb/dall year
BOD, 5-day, 20 deg. Cmonthly average≤ 133 lb/dall year
BOD, 5-day, 20 deg. Cweekly average= 500 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 200 lb/dall year
pHminimum= 6 SUall year
pHminimum≥ 6 SUall year
pHmaximum= 8.5 SUall year
pHmaximum≤ 8.5 SUall year
Solids, total suspendedmonthly average= 30 mg/Lall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedweekly average= 45 mg/Lall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average= 1001 lb/dall year
Solids, total suspendedmonthly average≤ 400 lb/dall year
Solids, total suspendedweekly average= 1502 lb/dall year
Solids, total suspendedweekly average≤ 600 lb/dall year
Nitrogen, total [as N]monthly averagereport only (mg/L)all 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]weekly averagereport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (lb/d)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, total [as N]weekly averagereport only (lb/d)all year
Nitrogen, ammonia total [as N]monthly average≤ 2.14 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 1.8 mg/LMar–Oct
Nitrogen, ammonia total [as N]monthly average= 6.5 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]monthly average= 3.2 mg/LMar–Oct
Nitrogen, ammonia total [as N]weekly average≤ 3.21 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 2.7 mg/LMar–Oct
Nitrogen, ammonia total [as N]weekly average= 9.8 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]weekly average= 4.8 mg/LMar–Oct
Nitrogen, ammonia total [as N]monthly average≤ 29 lb/dJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 24 lb/dMar–Oct
Nitrogen, ammonia total [as N]monthly average= 217 lb/dJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]monthly average= 107 lb/dMar–Oct
Nitrogen, ammonia total [as N]weekly average≤ 43 lb/dJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 36 lb/dMar–Oct
Nitrogen, ammonia total [as N]weekly average= 325 lb/dJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]weekly average= 160 lb/dMar–Oct
Phosphorus, total [as P]monthly average≤ 2 mg/Lall year
Phosphorus, total [as P]monthly average= 2 mg/Lall year
Phosphorus, total [as P]monthly averagereport only (lb/d)all year
Phosphorus, total [as P]monthly averagereport only (lb/d)all year
Phosphorus, total [as P]monthly average= 520 lb/dall year
Phosphorus, total [as P]monthly average≤ 520 lb/yrall year
Phosphorus, total [as P]monthly average= 4124.5 lb/dall year
Phosphorus, total [as P]monthly average= 4124.5 lb/dall year
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)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
Flow, in conduit or thru treatment plantweekly averagereport only (MGD)all year
Chlorine, total residualmonthly average≤ .011 mg/Lall year
Chlorine, total residualmonthly average= .011 mg/Lall year
Chlorine, total residualdaily maximum≤ .019 mg/Lall year
Chlorine, total residualdaily maximum= .019 mg/Lall year
Chlorine, total residualmonthly average≤ .15 lb/dall year
Chlorine, total residualmonthly average= .37 lb/dall year
Chlorine, total residualdaily maximum≤ .25 lb/dall year
Chlorine, total residualdaily maximum= .63 lb/dall year
E. coli30-day geometric mean= 126 MPN/100mLall year
E. colimonthly average≤ 126 MPN/100mLall year
E. colidaily maximum= 349 MPN/100mLall year
E. colidaily maximum≤ 349 MPN/100mLall year
E. coli30-day geometric mean≤ 126 MPN/100mLall year
E. coli30-day geometric mean= 126 MPN/100mLall year
E. colidaily maximum≤ 800 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≥ 85 %all year
BOD, 5-day, percent removalmonthly average minimum= 85 %all year
Solids, suspended 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.

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

· Save this facility as a site · Superfund sites nearby · Your permits on one board

On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/SC0036056 · MCP: https://passage-data.com/mcp