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City of Estherville

Sewage treatment plant, major discharger, Estherville, Iowa. NPDES permit IA0023744 expired Dec 31, 2025; its limits still apply. Last 12 months: over a limit 8 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (60 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
22 values over a limit, 3 required values missing, 0 of 12 reports late

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

Period endingParameterReportedLimitOver by
October 2025Chlorine, total residual, 30-day average.015652≤ .009 mg/L74%
October 2025Chlorine, total residual, daily maximum.02≤ .019 mg/L5%
November 2025Chlorine, total residual, 30-day average.01≤ .009 mg/L11%
November 2025Chlorine, total residual, daily maximum.02≤ .019 mg/L5%
August 2026Chlorine, total residual, 30-day average.014444≤ .009 mg/L60%
August 2026Chlorine, total residual, daily maximum.02≤ .019 mg/L5%
September 2026Chlorine, total residual, 30-day average.0185≤ .009 mg/L106%
September 2026Chlorine, total residual, daily maximum.02≤ .019 mg/L5%

Limits in force (82)

ParameterStatisticLimitMonths
Nitrogen, ammonia per cfs of streamflow30-day average≤ 13.2 lb/CFS/dDec
Nitrogen, ammonia per cfs of streamflow30-day average≤ 6.9 lb/CFS/dJun
Nitrogen, ammonia per cfs of streamflow30-day average≤ 5 lb/CFS/dAug
Nitrogen, ammonia per cfs of streamflow30-day average≤ 5.3 lb/CFS/dJul
Nitrogen, ammonia per cfs of streamflow30-day average≤ 9.2 lb/CFS/dMay
Nitrogen, ammonia per cfs of streamflow30-day average≤ 20.9 lb/CFS/dFeb
Nitrogen, ammonia per cfs of streamflow30-day average≤ 8.3 lb/CFS/dOct
Nitrogen, ammonia per cfs of streamflow30-day average≤ 8 lb/CFS/dApr
Nitrogen, ammonia per cfs of streamflow30-day average≤ 5.6 lb/CFS/dSep
Nitrogen, ammonia per cfs of streamflow30-day average≤ 12.4 lb/CFS/dNov
Nitrogen, ammonia per cfs of streamflow30-day average≤ 18.2 lb/CFS/dJan
Nitrogen, ammonia per cfs of streamflow30-day average≤ 10.7 lb/CFS/dMar
Nitrogen, ammonia per cfs of streamflowdaily maximum≤ 4.1 lb/CFS/dDec
Nitrogen, ammonia per cfs of streamflowdaily maximum≤ 3.7 lb/CFS/dJun
Nitrogen, ammonia per cfs of streamflowdaily maximum≤ 4.3 lb/CFS/dAug
Nitrogen, ammonia per cfs of streamflowdaily maximum≤ 4.7 lb/CFS/dJul
Nitrogen, ammonia per cfs of streamflowdaily maximum≤ 3.9 lb/CFS/dMay
Nitrogen, ammonia per cfs of streamflowdaily maximum≤ 3.7 lb/CFS/dFeb
Nitrogen, ammonia per cfs of streamflowdaily maximum≤ 4.1 lb/CFS/dOct
Nitrogen, ammonia per cfs of streamflowdaily maximum≤ 4.1 lb/CFS/dApr
Nitrogen, ammonia per cfs of streamflowdaily maximum≤ 4.3 lb/CFS/dSep
Nitrogen, ammonia per cfs of streamflowdaily maximum≤ 3.8 lb/CFS/dNov
Nitrogen, ammonia per cfs of streamflowdaily maximum≤ 3.9 lb/CFS/dJan
Nitrogen, ammonia per cfs of streamflowdaily maximum≤ 3.8 lb/CFS/dMar
Oxygen, dissolved [DO]daily minimum≥ 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≥ 6.5 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≤ 876 lb/dall year
Solids, total suspended7-day average≤ 1314 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, 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 averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year
Nitrogen, ammonia total [as N]30-day averagereport only (lb/d)all year
Nitrogen, ammonia total [as N]daily maximumreport only (lb/d)all year
Nitrogen, nitrate total [as N]30-day average≤ 1174 lb/dall year
Nitrogen, nitrate total [as N]daily maximum≤ 1922 lb/dall year
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
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≤ .01968 mg/Lall year
Copper, total [as Cu]daily maximum≤ .0273 mg/Lall year
Copper, total [as Cu]30-day average≤ .5743 lb/dall year
Copper, total [as Cu]daily maximum≤ .7969 lb/dall year
Chlorine, total residual30-day average≤ .009 mg/Lall year
Chlorine, total residualdaily maximum≤ .019 mg/Lall year
Chlorine, total residual30-day average≤ .255 lb/dall year
Chlorine, total residualdaily maximum≤ .563 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≤ 730 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 1168 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

Your permit document is the final word. As JSON: /api/v1/permits/IA0023744 · MCP: https://passage-data.com/mcp