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City of Ida Grove

Sewage treatment plant, Ida Grove, Iowa. NPDES permit IA0020761 expired Apr 30, 2026; its limits still apply. Last 12 months: over a limit once (last July 2026), 8 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (37 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
2 values over a limit, 4 required values missing, 1 of 12 reports late

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

Period endingParameterReportedLimitOver by
July 2026Nitrogen, ammonia total [as N], 30-day average3.896666≤ 2.7 mg/L44%

Limits in force (81)

ParameterStatisticLimitMonths
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 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≤ 98 lb/dall year
Solids, total suspended7-day average≤ 146 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, ammonia total [as N]30-day average≤ 9.1 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 4 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 2.8 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 4.1 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 10.5 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 6.6 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 2.5 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 2.7 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 5.4 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 4 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 2.7 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 6.2 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 16.2 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 16.5 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 17.3 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 16.5 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 15.3 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 16.8 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 17 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 18.5 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 15.6 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 15.9 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 15.2 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 15.4 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 24.9 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 11 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 7.7 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 11.3 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 28.6 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 18 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 6.9 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 7.3 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 14.9 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 11 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 8 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 16.9 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 51.7 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 53 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 55.7 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 53 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 48.7 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 53.9 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 55 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 59 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 50 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 51 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 49 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 49.6 lb/dNov
Chloride [as Cl]30-day average≤ 789 mg/Lall year
Chloride [as Cl]daily maximum≤ 789 mg/Lall year
Chloride [as Cl]30-day average≤ 2500 lb/dall year
Chloride [as Cl]daily maximum≤ 2500 lb/dall year
Copper, total [as Cu]30-day average≤ .05078 mg/Lall year
Copper, total [as Cu]daily maximum≤ .05078 mg/Lall year
Copper, total [as Cu]30-day average≤ .1595 lb/dall year
Copper, total [as Cu]daily maximum≤ .1617 lb/dall year
Chlorine, total residual30-day average≤ .021 mg/Lall year
Chlorine, total residualdaily maximum≤ .021 mg/Lall year
Chlorine, total residual30-day average≤ .058 lb/dall year
Chlorine, total residualdaily maximum≤ .067 lb/dall year
E. coligeometric mean≤ 126 #/100mLMar–Nov
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≤ 81 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 130 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/IA0020761 · MCP: https://passage-data.com/mcp