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City of Winterset

Sewage treatment plant, major discharger, Winterset, Iowa. NPDES permit IA0034291, in force until Apr 30, 2030. Last 12 months: over a limit 27 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (44 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
15 values over a limit, 2 required values missing, 0 of 12 reports late

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

All 27 values over a limit
Period endingParameterReportedLimitOver by
October 2025Copper, total [as Cu], 30-day average.0335≤ .0279 mg/L20%
October 2025Copper, total [as Cu], daily maximum.067≤ .0279 mg/L140%
October 2025E. coli, geometric mean235≤ 126 #/100mL87%
January 2026Copper, total [as Cu], 30-day average.037525≤ .0279 mg/L34%
January 2026Copper, total [as Cu], daily maximum.0631≤ .0279 mg/L126%
January 2026Solids, total suspended, 30-day average36.5≤ 30 mg/L22%
January 2026Solids, total suspended, 7-day average46≤ 45 mg/L2%
February 2026BOD, carbonaceous [5 day, 20 C], 30-day average44.125≤ 25 mg/L77%
February 2026BOD, carbonaceous [5 day, 20 C], 7-day average72≤ 40 mg/L80%
February 2026Copper, total [as Cu], 30-day average.042025≤ .0279 mg/L51%
February 2026Copper, total [as Cu], daily maximum.0672≤ .0279 mg/L141%
February 2026Nitrogen, ammonia total [as N], 30-day average21.66375≤ 12.7 mg/L71%
February 2026Nitrogen, ammonia total [as N], daily maximum33.8≤ 14.9 mg/L127%
February 2026Solids, total suspended, 30-day average66≤ 30 mg/L120%
February 2026Solids, total suspended, 7-day average100≤ 45 mg/L122%
March 2026Copper, total [as Cu], daily maximum.0368≤ .0279 mg/L32%
March 2026Copper, total [as Cu], daily maximum.413349≤ .3977 lb/d4%
March 2026Solids, total suspended, 30-day average39.8≤ 30 mg/L33%
March 2026Solids, total suspended, 7-day average57≤ 45 mg/L27%
April 2026Copper, total [as Cu], daily maximum.0495≤ .0279 mg/L77%
April 2026Solids, total suspended, 30-day average39.25≤ 30 mg/L31%
April 2026Solids, total suspended, 7-day average723.4382≤ 657 lb/d10%
April 2026Solids, total suspended, 7-day average94≤ 45 mg/L109%
May 2026E. coli, geometric mean593.71≤ 126 #/100mL371%
May 2026Nitrogen, ammonia total [as N], 30-day average3.87125≤ 3.6 mg/L8%
May 2026Oxygen, dissolved [DO], daily minimum4.28≥ 4.5 mg/L5%
July 2026E. coli, geometric mean225≤ 126 #/100mL79%

Limits in force (88)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimum≥ 4.5 mg/Lall year
BOD, 5-day, 20 deg. C30-day averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year
BOD, 5-day, 20 deg. C30-day averagereport only (lb/d)all year
BOD, 5-day, 20 deg. Cdaily maximumreport only (lb/d)all year
pHdaily minimum≥ 6.4 SUall year
pHdaily maximum≤ 9 SUall year
pH30-day averagereport only (SU)all year
pHdaily maximumreport only (SU)all year
Solids, total suspended30-day average≤ 30 mg/Lall year
Solids, total suspended7-day average≤ 45 mg/Lall year
Solids, total suspended30-day average≤ 438 lb/dall year
Solids, total suspended7-day average≤ 657 lb/dall year
Solids, total suspended30-day averagereport only (mg/L)all year
Solids, total suspendeddaily maximumreport only (mg/L)all year
Solids, total suspended30-day averagereport only (lb/d)all year
Solids, total suspendeddaily maximumreport only (lb/d)all year
Nitrogen, total [as N]30-day averagereport only (mg/L)all year
Nitrogen, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, total [as N]30-day averagereport only (lb/d)all year
Nitrogen, total [as N]daily maximumreport only (lb/d)all year
Nitrogen, ammonia total [as N]30-day average≤ 2.8 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 2.3 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 11.2 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 5.8 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 7.2 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 3.6 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 5.4 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 2.5 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 2.4 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 8.4 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 4.2 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 12.7 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 17 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 16.8 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 15.8 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 15.3 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 15.2 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 15.8 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 16.2 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 18.2 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 15 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 16.5 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 16.2 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 14.9 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 26.3 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 23.7 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 85.1 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 51.3 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 57.9 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 40.6 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 38.8 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 25 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 28.4 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 61.7 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 37.9 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 98.2 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 132.8 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 108 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 224.3 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 216.9 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 216.5 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 213.1 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 231.4 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 110.9 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 143 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 235.2 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 231.4 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 210.1 lb/dFeb
Nitrogen, Kjeldahl, total [as N]30-day averagereport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]30-day averagereport only (lb/d)all year
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (lb/d)all year
Phosphorus, total [as P]30-day averagereport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]30-day averagereport only (lb/d)all year
Phosphorus, total [as P]daily maximumreport only (lb/d)all year
Copper, total [as Cu]30-day average≤ .0279 mg/Lall year
Copper, total [as Cu]daily maximum≤ .0279 mg/Lall year
Copper, total [as Cu]30-day average≤ .3977 lb/dall year
Copper, total [as Cu]daily maximum≤ .3977 lb/dall year
E. coligeometric mean≤ 126 #/100mLMar–Nov
Toxicity [acute], Ceriodaphnia dubiadaily maximum≤ 1 N=0;Y=1all year
Toxicity [acute], Pimephales promelas [Fathead Minnow]daily maximum≤ 1 N=0;Y=1all year
BOD, carbonaceous [5 day, 20 C]30-day average≤ 25 mg/Lall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 40 mg/Lall year
BOD, carbonaceous [5 day, 20 C]30-day average≤ 365 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 584 lb/dall year

How strict are these limits?

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

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On EPA ECHO: Facility report · DMR history

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