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City of Walcott

Sewage treatment plant, major discharger, Walcott, Iowa. NPDES permit IA0061891, 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
2 values over a limit, 17 required values missing, 1 of 12 reports late

Limits in force (66)

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≤ 327 lb/dall year
Solids, total suspended7-day average≤ 491 lb/dall year
Nitrogen, ammonia total [as N]30-day average≤ 1.5 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 2.3 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 2.5 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 1.3 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 3.4 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 1.1 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 4 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 1.7 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 1.6 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 3.4 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 4 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 4 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 4 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 4 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 9 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 3 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 4 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 9 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 4 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 3 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 4 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 4 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 16.6 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 17.1 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 17.1 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 14.3 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 37.1 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 10.4 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 11.5 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 39 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 17.1 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 11 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 17 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 17.1 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 17.1 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 17.1 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 17.1 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 17.1 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 39 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 12.8 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 17.1 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 39 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 17.1 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 12.8 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 17.1 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 17.1 lb/dMar
Copper, total [as Cu]30-day average≤ .01687 mg/Lall year
Copper, total [as Cu]daily maximum≤ .0269 mg/Lall year
Copper, total [as Cu]30-day average≤ .184 lb/dall year
Copper, total [as Cu]daily maximum≤ .2934 lb/dall year
E. coligeometric mean≤ 630 #/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≤ 25 mg/Lall year
BOD, carbonaceous [5 day, 20 C]30-day average≤ 107 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 107 lb/dall year

New limits from Sep 1, 2031

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Chloride [as Cl], 30-day average4240 lb/dnew——
Chloride [as Cl], 30-day average389 mg/Lnew——
Chloride [as Cl], daily maximum629 mg/Lnew——
Chloride [as Cl], daily maximum6860 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/IA0061891 · MCP: https://passage-data.com/mcp