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City of Dewitt

Sewage treatment plant, major discharger, De Witt, Iowa. NPDES permit IA0035271, in force until Sep 30, 2029. Last 12 months: over a limit 3 times (last April 2026), 1 required value missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (56 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
1 value over a limit, 1 required value missing, 0 of 12 reports late

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

Period endingParameterReportedLimitOver by
January 2026Copper, total [as Cu], 30-day average.023575≤ .01687 mg/L40%
January 2026Copper, total [as Cu], daily maximum.0594≤ .0269 mg/L121%
April 2026Cadmium, total [as Cd], 30-day average.000832≤ .0004541 mg/L83%

Limits in force (100)

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≤ 535 lb/dall year
Solids, total suspended7-day average≤ 803 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
Nitrogen, total [as N]30-day averagereport only (mg/L)all year
Nitrogen, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, total [as N]30-day averagereport only (lb/d)all year
Nitrogen, total [as N]daily maximumreport only (lb/d)all year
Nitrogen, ammonia total [as N]30-day average≤ 2.1 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 1.7 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 1.1 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 4 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 2.1 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 1.6 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 1.5 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 2.1 mg/LMar
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/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 3.7 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 3.7 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 3.7 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 3.9 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 8.4 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 3.7 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 3.7 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 3.7 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 3.7 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 3.7 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 8.4 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 3.9 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 25 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 25 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 18.9 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 17 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 53 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 25 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 25 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 25 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 25 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 23.4 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 53 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 17.9 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 44 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 44 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 44 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 43 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 94 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 44 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 44 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 44 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 44 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 44 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 94 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 43 lb/dJul
Nitrogen, Kjeldahl, total [as N]30-day averagereport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]30-day averagereport only (lb/d)all year
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (lb/d)all year
Phosphorus, total [as P]30-day averagereport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]30-day averagereport only (lb/d)all year
Phosphorus, total [as P]daily maximumreport only (lb/d)all year
Chloride [as Cl]30-day average≤ 389 mg/Lall year
Chloride [as Cl]daily maximum≤ 629 mg/Lall year
Chloride [as Cl]30-day average≤ 6937 lb/dall year
Chloride [as Cl]daily maximum≤ 11224 lb/dall year
Cadmium, total [as Cd]30-day average≤ .0004541 mg/Lall year
Cadmium, total [as Cd]daily maximum≤ .004317 mg/Lall year
Cadmium, total [as Cd]30-day average≤ .00809 lb/dall year
Cadmium, total [as Cd]daily maximum≤ .07704 lb/dall year
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≤ .3011 lb/dall year
Copper, total [as Cu]daily maximum≤ .4801 lb/dall year
Zinc, total [as Zn]30-day average≤ .2156 mg/Lall year
Zinc, total [as Zn]daily maximum≤ .2156 mg/Lall year
Zinc, total [as Zn]30-day average≤ 3.847 lb/dall year
Zinc, total [as Zn]daily maximum≤ 3.847 lb/dall year
E. coligeometric mean≤ 233 #/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≤ 446 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 714 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/IA0035271 · MCP: https://passage-data.com/mcp