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City of Fort Atkinson

Sewage treatment plant, Fort Atkinson, Iowa. NPDES permit IA0072176, in force until Feb 28, 2030. Last 12 months: no values over a limit, 1 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (11 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 12 reports late

Limits in force (55)

ParameterStatisticLimitMonths
pHdaily minimum≥ 6.1 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspended30-day average≤ 80 mg/Lall year
Solids, total suspended7-day average≤ 120 mg/Lall year
Nitrogen, ammonia total [as N]30-day average≤ 1.7 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 3.2 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 5.4 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 2.9 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 3.7 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 3.8 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 1.5 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 2.8 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 1.6 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 3.4 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 6.2 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 2.4 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 2.9 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 4.2 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 20.3 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 3.7 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 3.7 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 4.1 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 2.9 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 2.8 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 3.5 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 5.1 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 8.8 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 2.8 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 14.6 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 28.6 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 47.3 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 25.7 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 32.4 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 33.8 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 13.2 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 25 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 13.9 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 29.8 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 54.6 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 21.2 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 25.3 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 37.1 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 179.8 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 32.4 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 32.4 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 35.9 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 25.7 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 25 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 30.6 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 45 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 77.6 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 25 lb/dOct
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

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/IA0072176 · MCP: https://passage-data.com/mcp