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City of Guthrie Center

Sewage treatment plant, Guthrie Center, Iowa. NPDES permit IA0041866, in force until Jul 31, 2027. Last 12 months: over a limit 2 times (last May 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (11 values)
Renewal application due
Feb 1, 2027 · 180 days before expiry; your permit may set another date
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
May 2026Nitrogen, ammonia total [as N], 30-day average6.65≤ 3.4 mg/L96%
May 2026Nitrogen, ammonia total [as N], daily maximum6.65≤ 3.4 mg/L96%

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≤ 1.2 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 1.3 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 4.5 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 4.3 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 2.7 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 3.4 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 2.3 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 5 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 3.4 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 1.3 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 3.9 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 3.7 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 3.3 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 4.9 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 20 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 3.4 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 8.5 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 3.4 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 3.9 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 3.9 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 28 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 29.4 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 104.5 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 99.7 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 62.9 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 79.8 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 53.6 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 115.4 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 79.9 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 30.9 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 91.9 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 85.2 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 63.1 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 76 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 114 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 465.1 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 62.9 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 79.8 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 62.9 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 197.5 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 79.9 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 62.9 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 91.9 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 91.5 lb/dDec
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

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/IA0041866 · MCP: https://passage-data.com/mcp