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City of Ackley

Sewage treatment plant, Ackley, Iowa. NPDES permit IA0035297, in force until May 31, 2030. Last 12 months: over a limit 7 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (33 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
16 values over a limit, 0 required values missing, 1 of 12 reports late

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

Period endingParameterReportedLimitOver by
November 2025Oil & Grease, 30-day average21≤ 10 mg/L110%
November 2025Oil & Grease, daily maximum21≤ 15 mg/L40%
January 2026Nitrogen, ammonia total [as N], 30-day average6.5375≤ 4.2 mg/L56%
January 2026Nitrogen, ammonia total [as N], daily maximum7.71≤ 7 mg/L10%
July 2026Oil & Grease, 30-day average33≤ 10 mg/L230%
July 2026Oil & Grease, daily maximum33≤ 15 mg/L120%
July 2026Phosphorus, total [as P], daily maximum34.17848≤ 32.9 lb/d4%

Limits in force (77)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimum≥ 5 mg/Lall year
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≥ 6.5 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≤ 217 lb/dall year
Solids, total suspended7-day average≤ 326 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
Oil & Grease30-day average≤ 10 mg/Lall year
Oil & Greasedaily maximum≤ 15 mg/Lall year
Nitrogen, total [as N]30-day average≤ 92.7 lb/dall year
Nitrogen, total [as N]daily maximum≤ 151.8 lb/dall year
Nitrogen, ammonia total [as N]30-day average≤ 3.1 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 1.3 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 1.9 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 4.2 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 1.2 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 2.9 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 1.6 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 1.2 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 2.1 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 4.2 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 1.9 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 4.9 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 7 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 8.5 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 8.5 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 7 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 7 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 5.8 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 7 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 7 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 8.5 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 8.5 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 7 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 8.5 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 19.2 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 8.2 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 11.8 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 26.5 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 7.8 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 18 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 10.2 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 7.4 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 13.5 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 26.4 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 12.1 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 30.7 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 50.4 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 61 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 61 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 50.5 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 50.5 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 41.6 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 50.5 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 50.5 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 61 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 61 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 50.4 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 61.1 lb/dFeb
Phosphorus, total [as P]30-day average≤ 13.3 lb/dall year
Phosphorus, total [as P]daily maximum≤ 32.9 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≤ 181 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 290 lb/dall year
Sediment, suspendeddaily maximum≤ 800 lb/dall year

How strict are these limits?

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

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Your permit document is the final word. As JSON: /api/v1/permits/IA0035297 · MCP: https://passage-data.com/mcp