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City of Marathon

Sewage treatment plant, Marathon, Iowa. NPDES permit IA0067652, in force until Sep 30, 2030. Last 12 months: over a limit 3 times (last May 2026), 1 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (18 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
3 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 2026BOD, carbonaceous [5 day, 20 C], 30-day average45.3≤ 25 mg/L81%
March 2026BOD, carbonaceous [5 day, 20 C], 7-day average45.3≤ 40 mg/L13%
May 2026pH, daily maximum9.07≤ 9 SU—

Limits in force (62)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimum≥ 4.4 mg/Lall year
pHdaily minimum≥ 6.5 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspended30-day average≤ 30 mg/Lall year
Solids, total suspended7-day average≤ 45 mg/Lall year
Solids, total suspended30-day average≤ 24 lb/dall year
Solids, total suspended7-day average≤ 36 lb/dall year
Nitrogen, ammonia total [as N]30-day average≤ 3.1 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 5.1 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 6.9 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 2.1 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 8.1 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 2 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 7.1 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 3.2 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 4.8 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 2.2 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 2.7 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 3.6 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 11.7 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 17.8 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 15.3 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 14 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 16.7 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 16.5 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 19.4 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 17.8 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 15.1 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 17.8 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 14 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 12.8 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 2 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 3.3 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 4.5 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 1.3 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 5.3 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 1.3 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 4.6 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 2.1 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 3.1 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 1.4 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 1.7 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 2.3 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 9 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 13.8 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 11.8 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 10.8 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 12.8 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 12.8 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 15 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 13.8 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 11.7 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 13.8 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 10.8 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 9.9 lb/dMay
Nitrogen, Kjeldahl, total [as N]30-day average≤ 15 lb/dall year
Nitrogen, Kjeldahl, total [as N]daily maximum≤ 25 lb/dall year
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
BOD, carbonaceous [5 day, 20 C]30-day average≤ 20 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 32 lb/dall 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/IA0067652 · MCP: https://passage-data.com/mcp