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City of Washington

Sewage treatment plant, major discharger, Washington, Iowa. NPDES permit IA0032433, in force until Sep 30, 2031. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Last report on file
September 2026
Oct 2024 – Sep 2025
6 values over a limit, 0 required values missing, 0 of 12 reports late

Limits in force (62)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimum≥ 5 mg/Lall year
pHdaily minimum≥ 6.5 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspended30-day average≤ 30 mg/Lall year
Solids, total suspended7-day average≤ 45 mg/Lall year
Solids, total suspended30-day average≤ 1561 lb/dall year
Solids, total suspended7-day average≤ 2342 lb/dall year
Nitrogen, ammonia total [as N]30-day average≤ 1.1 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 4.7 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 2.9 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 1.3 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 2.8 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 4.1 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 1.8 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 4 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 1.8 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 1.9 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 1.3 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 2.8 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 13.3 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 9.8 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 3.4 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 6.9 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 11.8 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 7.6 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 10.9 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 5.3 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 4.7 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 3.7 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 54.8 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 215.6 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 135 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 57.6 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 126.6 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 185.9 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 51.3 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 83.1 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 185.6 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 94.8 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 84.9 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 70 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 139.7 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 660.8 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 482 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 166.1 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 337.6 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 582.3 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 131.4 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 380 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 540.6 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 259.6 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 234.3 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 179.1 lb/dJun
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≤ 1301 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 2082 lb/dall year

New limits from Sep 1, 2031

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Selenium, total [as Se], 30-day average0.005191 mg/Lnew——
Selenium, total [as Se], 30-day average0.2628 lb/dnew——
Selenium, total [as Se], daily maximum0.01936 mg/Lnew——
Selenium, total [as Se], daily maximum1.005 lb/dnew——

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/IA0032433 · MCP: https://passage-data.com/mcp