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Town of Winnsboro

Sewage treatment plant, major discharger, Winnsboro, South Carolina. NPDES permit SC0020125 expired Sep 30, 2023; its limits still apply. Last 12 months: over a limit 97 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 29 days after each period: form 1 monthly (31 values), form 2 quarterly (6 values), form 3 quarterly (2 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
33 values over a limit, 0 required values missing, 0 of 20 reports late

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

All 97 values over a limit
Period endingParameterReportedLimitOver by
October 2025BOD, 5-day, 20 deg. C, monthly average34.4≤ 9.5 mg/L262%
October 2025BOD, 5-day, 20 deg. C, weekly average128≤ 14.25 mg/L798%
October 2025BOD, 5-day, 20 deg. C, weekly average636≤ 190 lb/d235%
October 2025BOD, 5-day, percent removal, monthly average minimum79.5≥ 85 %37%
October 2025E. coli, 30-day geometric mean155≤ 126 MPN/100mL23%
October 2025E. coli, daily maximum2419≤ 349 MPN/100mL593%
October 2025Nitrogen, ammonia total [as N], monthly average1.9≤ 1.5 mg/L27%
October 2025Nitrogen, ammonia total [as N], weekly average2.9≤ 2.25 mg/L29%
October 2025Solids, total suspended, monthly average40≤ 30 mg/L33%
October 2025Solids, total suspended, weekly average51≤ 45 mg/L13%
November 2025BOD, 5-day, 20 deg. C, monthly average132≤ 9.5 mg/L1289%
November 2025BOD, 5-day, 20 deg. C, monthly average455≤ 127 lb/d258%
November 2025BOD, 5-day, 20 deg. C, weekly average730≤ 14.25 mg/L5023%
November 2025BOD, 5-day, 20 deg. C, weekly average> 600≤ 190 lb/d—
November 2025BOD, 5-day, percent removal, monthly average minimum-83≥ 85 %1120%
November 2025Solids, suspended percent removal, monthly average minimum-350≥ 85 %2900%
November 2025Solids, total suspended, monthly average206≤ 30 mg/L587%
November 2025Solids, total suspended, monthly average711≤ 400 lb/d78%
November 2025Solids, total suspended, weekly average730≤ 45 mg/L1522%
November 2025Solids, total suspended, weekly average> 600≤ 600 lb/d—
December 2025%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia, daily maximum100≤ 40 %150%
December 2025%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia, monthly average100≤ 25 %300%
December 2025BOD, 5-day, 20 deg. C, monthly average30.6≤ 9.5 mg/L222%
December 2025BOD, 5-day, 20 deg. C, weekly average470≤ 190 lb/d147%
December 2025BOD, 5-day, 20 deg. C, weekly average81.3≤ 14.25 mg/L471%
December 2025Solids, total suspended, monthly average37.6≤ 30 mg/L25%
December 2025Solids, total suspended, weekly average46.2≤ 45 mg/L3%
January 2026BOD, 5-day, 20 deg. C, monthly average20.8≤ 9.5 mg/L119%
January 2026BOD, 5-day, 20 deg. C, weekly average34.6≤ 14.25 mg/L143%
January 2026Nitrogen, ammonia total [as N], monthly average4.7≤ 2.19 mg/L115%
January 2026Nitrogen, ammonia total [as N], weekly average6≤ 3.28 mg/L83%
January 2026Solids, total suspended, monthly average41.8≤ 30 mg/L39%
January 2026Solids, total suspended, weekly average54≤ 45 mg/L20%
February 2026BOD, 5-day, 20 deg. C, monthly average11.8≤ 9.5 mg/L24%
February 2026E. coli, 30-day geometric mean660≤ 126 MPN/100mL424%
February 2026E. coli, daily maximum19863≤ 349 MPN/100mL5591%
February 2026Nitrogen, ammonia total [as N], monthly average7.2≤ 2.19 mg/L229%
February 2026Nitrogen, ammonia total [as N], weekly average48≤ 44 lb/d9%
February 2026Nitrogen, ammonia total [as N], weekly average8.9≤ 3.28 mg/L171%
March 2026BOD, 5-day, 20 deg. C, monthly average32.7≤ 9.5 mg/L244%
March 2026BOD, 5-day, 20 deg. C, weekly average328.4≤ 190 lb/d73%
March 2026BOD, 5-day, 20 deg. C, weekly average65.1≤ 14.25 mg/L357%
March 2026E. coli, 30-day geometric mean505≤ 126 MPN/100mL301%
March 2026E. coli, daily maximum2419≤ 349 MPN/100mL593%
March 2026Nitrogen, ammonia total [as N], monthly average15≤ 1.5 mg/L900%
March 2026Nitrogen, ammonia total [as N], monthly average47.5≤ 20 lb/d138%
March 2026Nitrogen, ammonia total [as N], weekly average21≤ 2.25 mg/L833%
March 2026Nitrogen, ammonia total [as N], weekly average98.7≤ 30 lb/d229%
March 2026Solids, total suspended, monthly average34.7≤ 30 mg/L16%
March 2026Solids, total suspended, weekly average68.4≤ 45 mg/L52%
April 2026BOD, 5-day, 20 deg. C, monthly average12.2≤ 9.5 mg/L28%
April 2026BOD, 5-day, 20 deg. C, weekly average18.4≤ 14.25 mg/L29%
April 2026Chlorine, total residual, daily maximum.15≤ .019 mg/L689%
April 2026Chlorine, total residual, daily maximum.6≤ .25 lb/d140%
April 2026Chlorine, total residual, monthly average.09≤ .011 mg/L718%
April 2026Chlorine, total residual, monthly average.2≤ .15 lb/d33%
April 2026Nitrogen, ammonia total [as N], monthly average14.2≤ 1.5 mg/L847%
April 2026Nitrogen, ammonia total [as N], monthly average42.6≤ 20 lb/d113%
April 2026Nitrogen, ammonia total [as N], weekly average18.4≤ 2.25 mg/L718%
April 2026Nitrogen, ammonia total [as N], weekly average87.9≤ 30 lb/d193%
May 2026BOD, 5-day, 20 deg. C, monthly average22.2≤ 9.5 mg/L134%
May 2026BOD, 5-day, 20 deg. C, monthly average332.5≤ 127 lb/d162%
May 2026BOD, 5-day, 20 deg. C, weekly average355.6≤ 190 lb/d87%
May 2026BOD, 5-day, 20 deg. C, weekly average45.2≤ 14.25 mg/L217%
May 2026E. coli, daily maximum3076≤ 349 MPN/100mL781%
May 2026Nitrogen, ammonia total [as N], monthly average471≤ 20 lb/d2255%
May 2026Nitrogen, ammonia total [as N], monthly average6.95≤ 1.5 mg/L363%
May 2026Nitrogen, ammonia total [as N], weekly average11.1≤ 2.25 mg/L393%
May 2026Nitrogen, ammonia total [as N], weekly average533≤ 30 lb/d1677%
May 2026Solids, total suspended, monthly average600≤ 400 lb/d50%
May 2026Solids, total suspended, weekly average49.6≤ 45 mg/L10%
May 2026Solids, total suspended, weekly average800≤ 600 lb/d33%
June 2026BOD, 5-day, 20 deg. C, monthly average15.9≤ 9.5 mg/L67%
June 2026BOD, 5-day, 20 deg. C, weekly average29≤ 14.25 mg/L104%
June 2026Chlorine, total residual, daily maximum.12≤ .019 mg/L532%
June 2026Chlorine, total residual, daily maximum.63≤ .25 lb/d152%
June 2026Chlorine, total residual, monthly average.05≤ .011 mg/L355%
June 2026Chlorine, total residual, monthly average.26≤ .15 lb/d73%
June 2026Nitrogen, ammonia total [as N], monthly average2≤ 1.5 mg/L33%
June 2026Nitrogen, ammonia total [as N], weekly average5.2≤ 2.25 mg/L131%
July 2026BOD, 5-day, 20 deg. C, monthly average19≤ 9.5 mg/L100%
July 2026BOD, 5-day, 20 deg. C, weekly average37.8≤ 14.25 mg/L165%
July 2026Chlorine, total residual, daily maximum.09≤ .019 mg/L374%
July 2026Chlorine, total residual, daily maximum.38≤ .25 lb/d52%
July 2026Chlorine, total residual, monthly average.02≤ .011 mg/L82%
July 2026E. coli, 30-day geometric mean131≤ 126 MPN/100mL4%
July 2026E. coli, daily maximum980≤ 349 MPN/100mL181%
July 2026Nitrogen, ammonia total [as N], weekly average3.3≤ 2.25 mg/L47%
August 2026BOD, 5-day, 20 deg. C, monthly average18≤ 9.5 mg/L89%
August 2026BOD, 5-day, 20 deg. C, weekly average293≤ 190 lb/d54%
August 2026BOD, 5-day, 20 deg. C, weekly average48.8≤ 14.25 mg/L242%
August 2026Chlorine, total residual, daily maximum.18≤ .019 mg/L847%
August 2026Chlorine, total residual, daily maximum.43≤ .25 lb/d72%
August 2026Chlorine, total residual, monthly average.05≤ .011 mg/L355%
August 2026Nitrogen, ammonia total [as N], weekly average4.2≤ 2.25 mg/L87%
August 2026Solids, total suspended, monthly average35.4≤ 30 mg/L18%
August 2026Solids, total suspended, weekly average98.2≤ 45 mg/L118%

Limits in force (43)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]minimum≥ 5 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 9.5 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 14.25 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 127 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 190 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≤ 400 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]weekly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]monthly average≤ 1.5 mg/LMar–Oct
Nitrogen, ammonia total [as N]monthly average≤ 2.19 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 2.25 mg/LMar–Oct
Nitrogen, ammonia total [as N]weekly average≤ 3.28 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 20 lb/dMar–Oct
Nitrogen, ammonia total [as N]monthly average≤ 29 lb/dJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 30 lb/dMar–Oct
Nitrogen, ammonia total [as N]weekly average≤ 44 lb/dJan, Feb, Nov, Dec
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]weekly averagereport only (mg/L)all year
Hardness, total [as CaCO3]monthly averagereport only (mg/L)all year
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all 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
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≤ .011 mg/Lall year
Chlorine, total residualdaily maximum≤ .019 mg/Lall year
Chlorine, total residualmonthly average≤ .15 lb/dall year
Chlorine, total residualdaily maximum≤ .25 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
%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.

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Your permit document is the final word. As JSON: /api/v1/permits/SC0020125 · MCP: https://passage-data.com/mcp