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City of Dunkerton

Sewage treatment plant, Dunkerton, Iowa. NPDES permit IA0042790, in force until Jun 30, 2028. Last 12 months: over a limit 7 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (10 values)
Renewal application due
Jan 2, 2028 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
9 values over a limit, 0 required values missing, 1 of 12 reports late

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

Period endingParameterReportedLimitOver by
December 2025Nitrogen, ammonia total [as N], 30-day average9.965≤ 4.2 mg/L137%
December 2025Nitrogen, ammonia total [as N], daily maximum10.1≤ 4.2 mg/L140%
April 2026pH, daily maximum9.35≤ 9 SU—
May 2026Nitrogen, ammonia total [as N], 30-day average4.33≤ 4.1 mg/L6%
May 2026Nitrogen, ammonia total [as N], daily maximum4.33≤ 4.1 mg/L6%
June 2026Nitrogen, ammonia total [as N], 30-day average4.53≤ 4.1 mg/L10%
June 2026Nitrogen, ammonia total [as N], daily maximum4.53≤ 4.1 mg/L10%

Limits in force (54)

ParameterStatisticLimitMonths
pHdaily minimum≥ 6.4 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≤ 2.1 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 7.1 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 5.4 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 4.1 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 2.9 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 2.2 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 4.2 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 4.1 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 2.9 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 2 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 8.1 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 4.2 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 3.4 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 20.3 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 5.4 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 4.1 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 2.9 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 2.8 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 4.2 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 4.1 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 2.9 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 2.9 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 8.7 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 4.2 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 29.6 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 101.1 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 77.7 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 58.6 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 42.1 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 31.2 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 59.6 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 58.5 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 42.1 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 28.1 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 116.4 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 59.6 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 49.2 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 290.4 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 77.7 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 58.6 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 42.1 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 40.7 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 59.6 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 58.5 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 42.1 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 41.4 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 125.1 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 59.6 lb/dDec
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/IA0042790 · MCP: https://passage-data.com/mcp