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Rathbun Regional Water Association

Sewage treatment plant, Douds, Iowa. NPDES permit IA0076031, in force until Feb 28, 2031. Last 12 months: over a limit 3 times (last June 2026), 3 of 12 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
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 2 of 12 reports late

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

Period endingParameterReportedLimitOver by
May 2026Nitrogen, ammonia total [as N], 30-day average5.89≤ 2.5 mg/L136%
May 2026Nitrogen, ammonia total [as N], daily maximum5.89≤ 3.3 mg/L78%
June 2026E. coli, 30-day average659.36≤ 129 #/100mL411%

Limits in force (55)

ParameterStatisticLimitMonths
pHdaily minimum≥ 6 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≤ 4 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 2 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 3.2 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 3.4 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 1.9 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 2.7 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 2.2 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 2.5 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 3.4 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 1.1 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 8.4 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 4 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 3.9 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 3.3 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≤ 3.3 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 1.9 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 19.9 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 1.9 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 7.8 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 3.9 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 6.2 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 6.7 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 3.7 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 5.4 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 4.3 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 4.9 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 1.9 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 6.7 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 2.1 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 2 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 16.6 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 5.4 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 7.8 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 7.7 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 6.5 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 5.4 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 9.4 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 6.5 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 3.7 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 39.2 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 5.3 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 3.7 lb/dJul
E. coli30-day average≤ 129 #/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/IA0076031 · MCP: https://passage-data.com/mcp