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City of Hawkeye

Sewage treatment plant, Hawkeye, Iowa. NPDES permit IA0036072, in force until Dec 31, 2030. Last 12 months: no values over a limit. 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≥ 6.5 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≤ 1.2 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 4.3 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 1.1 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 1.5 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 2.7 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 2.3 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 3.1 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 2.1 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 1.9 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 3.7 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 3.7 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 8.4 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 4.8 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 3.9 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 19.9 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 3.9 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 6.8 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 25.5 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 6.2 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 6.5 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 8.8 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 15.9 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 13.6 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 18.3 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 12.2 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 11.5 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 22 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 21.9 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 15.8 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 50 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 15.9 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 19.1 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 19.2 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 15.9 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 28.1 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 23.2 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 19.2 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 15.9 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 118.1 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 23.2 lb/dMar
E. coligeometric mean≤ 229 #/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.

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/IA0036072 · MCP: https://passage-data.com/mcp