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City of Oelwein

Sewage treatment plant, major discharger, Oelwein, Iowa. NPDES permit IA0032344 expired May 31, 2026; its limits still apply. Last 12 months: over a limit 12 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (48 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 12 reports late

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

Period endingParameterReportedLimitOver by
February 2026Nitrogen, ammonia total [as N], 30-day average9.95625≤ 7.4 mg/L35%
March 2026Nitrogen, ammonia total [as N], 30-day average7.50125≤ 3.9 mg/L92%
April 2026Nitrogen, ammonia total [as N], 30-day average6.168181≤ 2.8 mg/L120%
April 2026Nitrogen, ammonia total [as N], 30-day average85.24151≤ 53.7 lb/d59%
April 2026Nitrogen, ammonia total [as N], daily maximum9.41≤ 9.1 mg/L3%
May 2026Nitrogen, ammonia total [as N], 30-day average89.71293≤ 46.7 lb/d92%
May 2026Nitrogen, ammonia total [as N], 30-day average9.643076≤ 2.5 mg/L286%
May 2026Nitrogen, ammonia total [as N], daily maximum14.4≤ 9.2 mg/L57%
June 2026Nitrogen, ammonia total [as N], 30-day average3.725615≤ 1.8 mg/L107%
June 2026Nitrogen, ammonia total [as N], 30-day average42.97861≤ 33.7 lb/d28%
June 2026Nitrogen, ammonia total [as N], daily maximum10.6≤ 8 mg/L33%
June 2026Nitrogen, ammonia total [as N], daily maximum138.927≤ 133.2 lb/d4%

Limits in force (92)

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≤ 666 lb/dall year
Solids, total suspended7-day average≤ 998 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, 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≤ 2.5 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 6.4 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 4.6 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 1.6 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 2 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 1.5 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 2.8 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 7.4 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 4.3 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 3.9 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 2.9 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 1.8 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 9.2 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 15.6 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 11 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 6.3 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 7.4 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 6.3 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 9.1 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 14.7 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 9.2 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 13.3 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 11.2 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 8 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 46.7 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 135.6 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 102.7 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 28.9 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 37.3 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 26.3 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 53.7 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 152.8 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 88.6 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 75 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 64.6 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 33.7 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 176.8 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 305.3 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 211.7 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 104.4 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 124.4 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 102.2 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 175.5 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 319.3 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 175.8 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 254.9 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 182.1 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 133.2 lb/dJun
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
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
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≤ 555 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 887 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/IA0032344 · MCP: https://passage-data.com/mcp