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City of Hartsville

Sewage treatment plant, major discharger, Hartsville, South Carolina. NPDES permit SC0021580, in force until Jun 30, 2027. Last 12 months: over a limit 2 times (last January 2026), 2 of 24 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form 1 monthly (29 values), form 1A monthly (29 values), form 2 yearly, form 2A yearly
Renewal application due
Jan 1, 2027 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 8 of 26 reports late

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

Period endingParameterReportedLimitOver by
December 2025Solids, suspended percent removal, monthly average minimum66≥ 85 %127%
January 2026Solids, suspended percent removal, monthly average minimum79≥ 85 %40%

Limits in force (72)

ParameterStatisticLimitMonths
Oxygen demand, ultimatemonthly average≤ 1536 lb/dJan, Feb, Nov, Dec
Oxygen demand, ultimatemonthly average≤ 1180 lb/dMar–Oct
Oxygen demand, ultimatemonthly average≤ 2194 lb/dJan, Feb, Nov, Dec
Oxygen demand, ultimatemonthly average≤ 1628 lb/dMar–Oct
Oxygen demand, ultimateweekly averagereport only (lb/d)Jan, Feb, Nov, Dec
Oxygen demand, ultimateweekly averagereport only (lb/d)Mar–Oct
Oxygen demand, ultimateweekly averagereport only (lb/d)Jan, Feb, Nov, Dec
Oxygen demand, ultimateweekly averagereport only (lb/d)Mar–Oct
Oxygen, dissolved [DO]minimum≥ 4 mg/Lall year
Oxygen, dissolved [DO]minimum≥ 6 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 15 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 15 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 22.5 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 22.5 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 438 lb/dall year
BOD, 5-day, 20 deg. Cmonthly average≤ 438 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 657 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 657 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≤ 876 lb/dall year
Solids, total suspendedmonthly average≤ 876 lb/dall year
Solids, total suspendedweekly average≤ 1314 lb/dall year
Solids, total suspendedweekly average≤ 1314 lb/dall year
Nitrogen, ammonia total [as N]monthly average≤ 9.7 mg/LMar–Oct
Nitrogen, ammonia total [as N]monthly average≤ 20 mg/LJan, Feb, Nov, Dec
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≤ 14.5 mg/LMar–Oct
Nitrogen, ammonia total [as N]weekly average≤ 30 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 17 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 12 mg/LMar–Oct
Nitrogen, ammonia total [as N]monthly average≤ 283 lb/dMar–Oct
Nitrogen, ammonia total [as N]monthly average≤ 584 lb/dJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 321 lb/dJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 239 lb/dMar–Oct
Nitrogen, ammonia total [as N]weekly average≤ 425 lb/dMar–Oct
Nitrogen, ammonia total [as N]weekly average≤ 876 lb/dJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 496 lb/dJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 350 lb/dMar–Oct
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≤ .114 mg/Lall year
Chlorine, total residualmonthly average≤ .09 mg/Lall year
Chlorine, total residualdaily maximum≤ .196 mg/Lall year
Chlorine, total residualdaily maximum≤ .16 mg/Lall year
Chlorine, total residualmonthly average≤ 3.33 lb/dall year
Chlorine, total residualmonthly average≤ 2.6 lb/dall year
Chlorine, total residualdaily maximum≤ 5.72 lb/dall year
Chlorine, total residualdaily maximum≤ 4.7 lb/dall year
E. coli30-day geometric mean≤ 126 MPN/100mLall year
E. coli30-day geometric mean≤ 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
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
Pass/Fail Static 48Hr Acute Ceriodaphnia dubiadaily maximum≤ 0 pass=0;fail=1all year
Pass/Fail Static 48Hr Acute Ceriodaphnia dubiadaily maximum≤ 0 pass=0;fail=1all year

New limits from May 1, 2027

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Chlorine, total residual, daily maximum4.1 lb/dtighter0.53 lb/d (11 values, 9 below detection)—
Chlorine, total residual, daily maximum0.11 mg/Ltighter0.05 mg/L (11 values, 10 below detection)—
Chlorine, total residual, monthly average2.3 lb/dtighter0.48 lb/d (11 values, 11 below detection)—
Chlorine, total residual, monthly average0.06 mg/Ltighter0.05 mg/L (11 values, 11 below detection)—
Nitrogen, ammonia total [as N], monthly average7 mg/L (Mar–Oct)tighter0.18 mg/L (7 values, 4 below detection)—
Nitrogen, ammonia total [as N], weekly average11 mg/L (Mar–Oct)tighter0.19 mg/L (7 values)0.0173×

How strict are these limits?

Cited limits by parameter: South Carolina's rules and the federal ones.

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Your permit document is the final word. As JSON: /api/v1/permits/SC0021580 · MCP: https://passage-data.com/mcp