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Rock Hill City of

Sewage treatment plant, major discharger, Rock Hill, South Carolina. NPDES permit SC0020443, in force until Apr 30, 2028. Last 12 months: over a limit once (last July 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 29 days after each period: form 1 monthly (40 values), form 2 yearly
Renewal application due
Nov 2, 2027 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 0 of 13 reports late

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

Period endingParameterReportedLimit
July 2026pH, minimum5.9≥ 6 SU

Limits in force (44)

ParameterStatisticLimitMonths
Oxygen demand, ultimatemonthly average≤ 15471 lb/dall year
Oxygen demand, ultimateweekly averagereport only (lb/d)all year
Oxygen, dissolved [DO]minimum≥ 6 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 20.4 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 30.6 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 3403 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 5105 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≤ 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, total [as N]12-month average≤ 2000000 lb/yrall year
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]weekly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]monthly averagereport only (lb/d)all year
Nitrogen, ammonia total [as N]weekly averagereport only (lb/d)all year
Phosphorus, total [as P]12-month average≤ 45500 lb/yrall year
Phosphorus, total [as P]monthly average≤ 2 mg/Lall 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
Phosphorus, total [as P]monthly load≤ 5100 lb/moall 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≤ .26 mg/Lall year
Chlorine, total residualdaily maximum≤ .45 mg/Lall year
Chlorine, total residualmonthly average≤ 43.7 lb/dall year
Chlorine, total residualdaily maximum≤ 75.4 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 averagereport only (%)all year
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiadaily maximumreport only (%)all year
IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubiadaily minimumreport only (%)all year

New limits from Mar 1, 2028

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Peracetic Acid, daily maximum1 mg/Lnew——
Peracetic Acid, daily maximum167 lb/dnew——

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/SC0020443 · MCP: https://passage-data.com/mcp