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City of Dunlap

Sewage treatment plant, Dunlap, Iowa. NPDES permit IA0042871, in force until Jan 31, 2030. Last 12 months: over a limit 6 times (last May 2026), 1 of 11 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
August 2026
Oct 2024 – Sep 2025
5 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
November 2025E. coli, geometric mean2419.6≤ 126 #/100mL1820%
May 2026BOD, carbonaceous [5 day, 20 C], 30-day average42.1≤ 25 mg/L68%
May 2026BOD, carbonaceous [5 day, 20 C], 7-day average42.7≤ 40 mg/L7%
May 2026E. coli, geometric mean1553.38≤ 126 #/100mL1133%
May 2026Solids, total suspended, 30-day average119≤ 80 mg/L49%
May 2026Solids, total suspended, 7-day average146≤ 120 mg/L22%

Limits in force (55)

ParameterStatisticLimitMonths
pHdaily minimum≥ 6.1 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≤ 5.9 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 12.9 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 3.4 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 5.9 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 6.9 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 3.6 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 3.6 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 10 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 3.4 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 5.2 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 3.8 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 4.6 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 5.9 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 21.8 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 3.4 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 5.9 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 6.9 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 3.8 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 3.6 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 10 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 3.4 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 5.2 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 4.3 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 4.6 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 75.4 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 166 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 43.3 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 75.3 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 88.3 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 46 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 45.8 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 128.5 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 43.3 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 67.1 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 48.5 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 59 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 75.4 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 279.6 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 43.3 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 75.3 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 88.3 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 48.5 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 45.8 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 128.5 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 43.3 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 67.1 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 55.5 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 59 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.

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