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City of Clinton

Sewage treatment plant, major discharger, Clinton, Iowa. NPDES permit IA0035947, in force until Jun 30, 2031. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (19 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
2 values over a limit, 6 required values missing, 0 of 12 reports late

Limits in force (63)

ParameterStatisticLimitMonths
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≤ 5029 lb/dall year
Solids, total suspended7-day average≤ 7544 lb/dall year
Nitrogen, ammonia total [as N]30-day average≤ 39.8 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 50.1 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 37.7 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 42.1 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 44.5 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 40.9 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 36.3 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 42.3 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 38.2 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 38.8 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 45.2 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 37.6 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 39.8 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 50.1 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 37.7 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 44.3 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 44.5 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 40.9 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 36.3 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 42.3 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 38.2 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 38.8 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 45.2 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 37.6 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 4940.7 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 5895.2 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 4867.2 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 4142.9 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 5408.5 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 5120.1 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 4639.1 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 4365.6 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 4940.8 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 4817 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 5516.8 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 4864.3 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 4940.7 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 5895.2 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 4867.2 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 5660.1 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 5408.5 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 5120.1 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 4639.1 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 5348.2 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 4940.8 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 5052.1 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 5516.8 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 4864.3 lb/dOct
E. coligeometric mean≤ 126 #/100mLMar–Nov
Toxicity [acute], Ceriodaphnia dubiadaily maximum≤ 1 N=0;Y=1all year
Toxicity [acute], Pimephales promelas [Fathead Minnow]daily maximum≤ 1 N=0;Y=1all year
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≤ 4191 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 6705 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/IA0035947 · MCP: https://passage-data.com/mcp