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City of Duncombe

Sewage treatment plant, Duncombe, Iowa. NPDES permit IA0027413, in force until Mar 31, 2031. Last 12 months: over a limit 2 times (last March 2026). 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

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

Period endingParameterReportedLimitOver by
March 2026Nitrogen, ammonia total [as N], 30-day average4.3591≤ 3.6 mg/L21%
March 2026Nitrogen, ammonia total [as N], daily maximum4.3591≤ 3.9 mg/L12%

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≤ 3.6 mg/LMar
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≤ 2.5 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 3.6 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 1.6 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 1.4 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 1.7 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 1.1 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 1.8 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 2.6 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 4.2 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 3.9 mg/LMar
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≤ 2.7 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 19.9 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 4.7 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 3.9 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 8.4 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 31.6 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 8.9 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 9.3 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 21.6 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 31.6 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 14.2 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 12.2 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 14.5 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 9.8 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 16.1 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 23 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 36.7 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 34.2 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 23.4 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 28.2 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 23.3 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 174.5 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 41.4 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 28.2 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 23.3 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 23.3 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 28.2 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 34.1 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 73.8 lb/dFeb
Annual Nitrate Nitrogen Dischargeddaily maximum≤ 4672 lb/yrall 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

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/IA0027413 · MCP: https://passage-data.com/mcp