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City of Marshalltown

Sewage treatment plant, major discharger, Marshalltown, Iowa. NPDES permit IA0038610, in force until Oct 31, 2027. Last 12 months: over a limit 3 times (last February 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (22 values)
Renewal application due
May 4, 2027 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
1 value over a limit, 4 required values missing, 0 of 12 reports late

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

Period endingParameterReportedLimitOver by
November 2025Solids, total suspended, 7-day average45.28571≤ 45 mg/L1%
February 2026Solids, total suspended, 30-day average43≤ 30 mg/L43%
February 2026Solids, total suspended, 7-day average63.28571≤ 45 mg/L41%

Limits in force (66)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimum≥ 3.3 mg/Lall year
pHdaily minimum≥ 6.1 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≤ 3263 lb/dall year
Solids, total suspended7-day average≤ 4894 lb/dall year
Nitrogen, ammonia total [as N]30-day average≤ 12.5 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 10 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 6 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 4.5 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 14.8 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 4 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 19.8 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 22.4 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 10 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 7.1 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 4.6 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 4.1 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 29.2 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 35.4 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 26 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 13 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 32.8 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 16.6 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 38 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 40.8 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 32.4 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 30.5 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 15.2 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 14 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 856 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 688 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 422 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 298 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 1007 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 288 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 1342 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 1519 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 691 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 495 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 326 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 272 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 2397 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 2713 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 1718 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 892 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 2696.7 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 1131 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 2906 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 2983.3 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 2045 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 2528 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 1033 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 924 lb/dAug
Copper, total [as Cu]30-day average≤ .04753 mg/Lall year
Copper, total [as Cu]daily maximum≤ .075 mg/Lall year
Copper, total [as Cu]30-day average≤ 3.471 lb/dall year
Copper, total [as Cu]daily maximum≤ 5.493 lb/dall year
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≤ 2719 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 4350 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/IA0038610 · MCP: https://passage-data.com/mcp