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City of Iowa Falls

Sewage treatment plant, major discharger, Iowa Falls, Iowa. NPDES permit IA0023442, in force until Aug 31, 2031. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (22 values), outfall 019 form A monthly (20 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 24 reports late

Limits in force (130)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]daily minimum≥ .7 mg/Lall year001
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspended30-day average≤ 30 mg/Lall year001
Solids, total suspended7-day average≤ 45 mg/Lall year001
Solids, total suspended30-day average≤ 657 lb/dall year001
Solids, total suspended7-day average≤ 985 lb/dall year001
Nitrogen, ammonia total [as N]30-day average≤ 10.6 mg/LJul001
Nitrogen, ammonia total [as N]30-day average≤ 21.3 mg/LMar001
Nitrogen, ammonia total [as N]30-day average≤ 16 mg/LApr001
Nitrogen, ammonia total [as N]30-day average≤ 10 mg/LAug001
Nitrogen, ammonia total [as N]30-day average≤ 41.5 mg/LFeb001
Nitrogen, ammonia total [as N]30-day average≤ 16.5 mg/LOct001
Nitrogen, ammonia total [as N]30-day average≤ 26.2 mg/LDec001
Nitrogen, ammonia total [as N]30-day average≤ 18.3 mg/LMay001
Nitrogen, ammonia total [as N]30-day average≤ 36.3 mg/LJan001
Nitrogen, ammonia total [as N]30-day average≤ 11.1 mg/LSep001
Nitrogen, ammonia total [as N]30-day average≤ 13.8 mg/LJun001
Nitrogen, ammonia total [as N]30-day average≤ 24.6 mg/LNov001
Nitrogen, ammonia total [as N]daily maximum≤ 61.7 mg/LJul001
Nitrogen, ammonia total [as N]daily maximum≤ 65.1 mg/LMar001
Nitrogen, ammonia total [as N]daily maximum≤ 51.9 mg/LApr001
Nitrogen, ammonia total [as N]daily maximum≤ 59.6 mg/LAug001
Nitrogen, ammonia total [as N]daily maximum≤ 74.9 mg/LFeb001
Nitrogen, ammonia total [as N]daily maximum≤ 52 mg/LOct001
Nitrogen, ammonia total [as N]daily maximum≤ 52.3 mg/LDec001
Nitrogen, ammonia total [as N]daily maximum≤ 58.1 mg/LMay001
Nitrogen, ammonia total [as N]daily maximum≤ 66.5 mg/LJan001
Nitrogen, ammonia total [as N]daily maximum≤ 53.2 mg/LSep001
Nitrogen, ammonia total [as N]daily maximum≤ 57.1 mg/LJun001
Nitrogen, ammonia total [as N]daily maximum≤ 50.5 mg/LNov001
Nitrogen, ammonia total [as N]30-day average≤ 112.9 lb/dJul001
Nitrogen, ammonia total [as N]30-day average≤ 228.4 lb/dMar001
Nitrogen, ammonia total [as N]30-day average≤ 171.2 lb/dApr001
Nitrogen, ammonia total [as N]30-day average≤ 107.1 lb/dAug001
Nitrogen, ammonia total [as N]30-day average≤ 443.8 lb/dFeb001
Nitrogen, ammonia total [as N]30-day average≤ 175.8 lb/dOct001
Nitrogen, ammonia total [as N]30-day average≤ 279.8 lb/dDec001
Nitrogen, ammonia total [as N]30-day average≤ 195.7 lb/dMay001
Nitrogen, ammonia total [as N]30-day average≤ 387 lb/dJan001
Nitrogen, ammonia total [as N]30-day average≤ 118.8 lb/dSep001
Nitrogen, ammonia total [as N]30-day average≤ 147.6 lb/dJun001
Nitrogen, ammonia total [as N]30-day average≤ 263.1 lb/dNov001
Nitrogen, ammonia total [as N]daily maximum≤ 829.7 lb/dJul001
Nitrogen, ammonia total [as N]daily maximum≤ 811.6 lb/dMar001
Nitrogen, ammonia total [as N]daily maximum≤ 709.2 lb/dApr001
Nitrogen, ammonia total [as N]daily maximum≤ 787.5 lb/dAug001
Nitrogen, ammonia total [as N]daily maximum≤ 894.1 lb/dFeb001
Nitrogen, ammonia total [as N]daily maximum≤ 709.8 lb/dOct001
Nitrogen, ammonia total [as N]daily maximum≤ 717.2 lb/dDec001
Nitrogen, ammonia total [as N]daily maximum≤ 755.8 lb/dMay001
Nitrogen, ammonia total [as N]daily maximum≤ 832.5 lb/dJan001
Nitrogen, ammonia total [as N]daily maximum≤ 734.4 lb/dSep001
Nitrogen, ammonia total [as N]daily maximum≤ 734.9 lb/dJun001
Nitrogen, ammonia total [as N]daily maximum≤ 679.3 lb/dNov001
Chlorine, total residual30-day average≤ .094 mg/Lall year001
Chlorine, total residualdaily maximum≤ .18 mg/Lall year001
Chlorine, total residual30-day average≤ 1 lb/dall year001
Chlorine, total residualdaily maximum≤ 2 lb/dall year001
E. coligeometric mean≤ 126 #/100mLMar–Nov001
Toxicity [acute], Ceriodaphnia dubiadaily maximum≤ 1 N=0;Y=1all year001
Toxicity [acute], Pimephales promelas [Fathead Minnow]daily maximum≤ 1 N=0;Y=1all year001
BOD, carbonaceous [5 day, 20 C]30-day average≤ 25 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]7-day average≤ 40 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]30-day average≤ 547 lb/dall year001
BOD, carbonaceous [5 day, 20 C]7-day average≤ 876 lb/dall year001
Oxygen, dissolved [DO]daily minimum≥ .7 mg/Lall year019
pHdaily minimum≥ 6.2 SUall year019
pHdaily maximum≤ 9 SUall year019
Solids, total suspended30-day average≤ 30 mg/Lall year019
Solids, total suspended7-day average≤ 45 mg/Lall year019
Solids, total suspended30-day average≤ 657 lb/dall year019
Solids, total suspended7-day average≤ 985 lb/dall year019
Nitrogen, ammonia total [as N]30-day average≤ 15.7 mg/LFeb019
Nitrogen, ammonia total [as N]30-day average≤ 8.1 mg/LMar019
Nitrogen, ammonia total [as N]30-day average≤ 4 mg/LJul019
Nitrogen, ammonia total [as N]30-day average≤ 4.2 mg/LSep019
Nitrogen, ammonia total [as N]30-day average≤ 3.8 mg/LAug019
Nitrogen, ammonia total [as N]30-day average≤ 9.9 mg/LDec019
Nitrogen, ammonia total [as N]30-day average≤ 9.3 mg/LNov019
Nitrogen, ammonia total [as N]30-day average≤ 5.2 mg/LJun019
Nitrogen, ammonia total [as N]30-day average≤ 6.1 mg/LApr019
Nitrogen, ammonia total [as N]30-day average≤ 6.2 mg/LOct019
Nitrogen, ammonia total [as N]30-day average≤ 6.9 mg/LMay019
Nitrogen, ammonia total [as N]30-day average≤ 13.7 mg/LJan019
Nitrogen, ammonia total [as N]daily maximum≤ 16.2 mg/LFeb019
Nitrogen, ammonia total [as N]daily maximum≤ 16.4 mg/LMar019
Nitrogen, ammonia total [as N]daily maximum≤ 19.4 mg/LJul019
Nitrogen, ammonia total [as N]daily maximum≤ 18 mg/LSep019
Nitrogen, ammonia total [as N]daily maximum≤ 17.9 mg/LAug019
Nitrogen, ammonia total [as N]daily maximum≤ 17.5 mg/LDec019
Nitrogen, ammonia total [as N]daily maximum≤ 16.1 mg/LNov019
Nitrogen, ammonia total [as N]daily maximum≤ 16 mg/LJun019
Nitrogen, ammonia total [as N]daily maximum≤ 17.2 mg/LApr019
Nitrogen, ammonia total [as N]daily maximum≤ 17.2 mg/LOct019
Nitrogen, ammonia total [as N]daily maximum≤ 16.8 mg/LMay019
Nitrogen, ammonia total [as N]daily maximum≤ 17 mg/LJan019
Nitrogen, ammonia total [as N]30-day average≤ 309.8 lb/dFeb019
Nitrogen, ammonia total [as N]30-day average≤ 160 lb/dMar019
Nitrogen, ammonia total [as N]30-day average≤ 78.8 lb/dJul019
Nitrogen, ammonia total [as N]30-day average≤ 82.9 lb/dSep019
Nitrogen, ammonia total [as N]30-day average≤ 74.8 lb/dAug019
Nitrogen, ammonia total [as N]30-day average≤ 195.2 lb/dDec019
Nitrogen, ammonia total [as N]30-day average≤ 183.5 lb/dNov019
Nitrogen, ammonia total [as N]30-day average≤ 103 lb/dJun019
Nitrogen, ammonia total [as N]30-day average≤ 119.5 lb/dApr019
Nitrogen, ammonia total [as N]30-day average≤ 122.6 lb/dOct019
Nitrogen, ammonia total [as N]30-day average≤ 136.6 lb/dMay019
Nitrogen, ammonia total [as N]30-day average≤ 269.8 lb/dJan019
Nitrogen, ammonia total [as N]daily maximum≤ 349 lb/dFeb019
Nitrogen, ammonia total [as N]daily maximum≤ 355.1 lb/dMar019
Nitrogen, ammonia total [as N]daily maximum≤ 419.3 lb/dJul019
Nitrogen, ammonia total [as N]daily maximum≤ 390.8 lb/dSep019
Nitrogen, ammonia total [as N]daily maximum≤ 387.4 lb/dAug019
Nitrogen, ammonia total [as N]daily maximum≤ 378.3 lb/dDec019
Nitrogen, ammonia total [as N]daily maximum≤ 348.5 lb/dNov019
Nitrogen, ammonia total [as N]daily maximum≤ 345.9 lb/dJun019
Nitrogen, ammonia total [as N]daily maximum≤ 372.2 lb/dApr019
Nitrogen, ammonia total [as N]daily maximum≤ 372.2 lb/dOct019
Nitrogen, ammonia total [as N]daily maximum≤ 363.2 lb/dMay019
Nitrogen, ammonia total [as N]daily maximum≤ 367.1 lb/dJan019
Chlorine, total residual30-day average≤ .023 mg/Lall year019
Chlorine, total residualdaily maximum≤ .023 mg/Lall year019
Chlorine, total residual30-day average≤ .389 lb/dall year019
Chlorine, total residualdaily maximum≤ .457 lb/dall year019
E. coligeometric mean≤ 126 #/100mLMar–Nov019
BOD, carbonaceous [5 day, 20 C]30-day average≤ 25 mg/Lall year019
BOD, carbonaceous [5 day, 20 C]7-day average≤ 40 mg/Lall year019
BOD, carbonaceous [5 day, 20 C]30-day average≤ 547 lb/dall year019
BOD, carbonaceous [5 day, 20 C]7-day average≤ 876 lb/dall year019

New limits from Sep 1, 2030

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Chlorine, total residual, 30-day average outfall 0010.07 mg/Ltighter——
Chlorine, total residual, 30-day average outfall 0010.767 lb/dtighter——
Chlorine, total residual, daily maximum outfall 0011.719 lb/dtighter——
Chlorine, total residual, daily maximum outfall 0010.156 mg/Ltighter——
Chlorine, total residual, 30-day average outfall 0190.358 lb/dtighter——

How strict are these limits?

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

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