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City of Eagle Grove

Sewage treatment plant, major discharger, Eagle Grove, Iowa. NPDES permit IA0034380, in force until Feb 28, 2030. Last 12 months: over a limit 2 times (last June 2026), 2 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (42 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
3 values over a limit, 2 required values missing, 0 of 12 reports late

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

Period endingParameterReportedLimitOver by
May 2026Oxygen, dissolved [DO], daily minimum4.11≥ 5 mg/L18%
June 2026Nitrogen, nitrate total [as N], 30-day average375.1223≤ 342 lb/d10%

Limits in force (86)

ParameterStatisticLimitMonths
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≤ 1038 lb/dall year
Solids, total suspended7-day average≤ 1557 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≤ 3.5 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 2.3 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 4.5 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 2.7 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 3.1 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 3.2 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 2.9 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 2.5 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 4.4 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 2.6 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 3.7 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 3.1 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 18.2 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 23.1 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 18.7 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 23.3 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 16 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 20.2 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 18.4 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 23.1 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 22.7 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 22.7 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 17 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 24.9 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 121.6 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 77.4 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 155.7 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 91.3 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 106.4 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 111.1 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 100.8 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 85.5 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 151.7 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 88.2 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 127.2 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 105 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 628.4 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 764.9 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 648.2 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 806.4 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 552.8 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 699.1 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 638.3 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 764.9 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 784.5 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 784.5 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 589.8 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 862.3 lb/dNov
Nitrogen, nitrate total [as N]30-day average≤ 342 lb/dall year
Nitrogen, nitrate total [as N]daily maximum≤ 560 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
E. coligeometric mean≤ 158 #/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≤ 865 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 1384 lb/dall year

How strict are these limits?

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

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