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City of Coggon

Sewage treatment plant, Coggon, Iowa. NPDES permit IA0024473, in force until Feb 29, 2028. Last 12 months: over a limit 7 times (last August 2026), 1 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (25 values)
Renewal application due
Sep 2, 2027 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
6 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
April 2026E. coli, geometric mean137.2743≤ 126 #/100mL9%
June 2026Nitrogen, ammonia total [as N], 30-day average11.5≤ 7.7 mg/L49%
June 2026Nitrogen, ammonia total [as N], 30-day average8.050185≤ 5.2 lb/d55%
July 2026Nitrogen, ammonia total [as N], 30-day average5.97978≤ 5.8 lb/d3%
August 2026E. coli, geometric mean24000≤ 126 #/100mL18948%
August 2026Nitrogen, ammonia total [as N], 30-day average8.159647≤ 5.2 lb/d57%
August 2026Nitrogen, ammonia total [as N], 30-day average8.65≤ 8.4 mg/L3%

Limits in force (69)

ParameterStatisticLimitMonths
BOD, 5-day, 20 deg. C30-day averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year
BOD, 5-day, 20 deg. C30-day averagereport only (lb/d)all year
BOD, 5-day, 20 deg. Cdaily maximumreport only (lb/d)all year
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 9 SUall year
pH30-day averagereport only (SU)all year
pHdaily maximumreport only (SU)all year
Solids, total suspended30-day average≤ 30 mg/Lall year
Solids, total suspended7-day average≤ 45 mg/Lall year
Solids, total suspended30-day average≤ 40 lb/dall year
Solids, total suspended7-day average≤ 59 lb/dall year
Solids, total suspended30-day averagereport only (mg/L)all year
Solids, total suspendeddaily maximumreport only (mg/L)all year
Solids, total suspended30-day averagereport only (lb/d)all year
Solids, total suspendeddaily maximumreport only (lb/d)all year
Nitrogen, ammonia total [as N]30-day average≤ 7.7 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 8.4 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 11.8 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 9.2 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 17.8 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 8.9 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 18.6 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 18.7 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 17 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 18.4 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 18.9 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 14.1 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 16.7 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 18.5 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 17.5 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 20.3 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 17.8 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 19.3 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 18.6 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 18.7 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 17 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 18.4 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 18.9 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 18.1 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 5.2 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 5.2 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 7.8 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 5.8 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 12.9 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 5.9 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 21 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 19 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 16.1 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 12.9 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 22 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 9.2 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 20.3 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 22.7 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 21.3 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 24.7 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 21 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 23.3 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 21 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 22.5 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 20.6 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 22.2 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 22 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 22 lb/dApr
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≤ 33 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 53 lb/dall year

How strict are these limits?

Cited limits by parameter: Iowa's rules and the federal ones.

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