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City of Winfield

Sewage treatment plant, Winfield, Iowa. NPDES permit IA0033367, in force until Aug 31, 2028. Last 12 months: over a limit 3 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (26 values)
Renewal application due
Mar 4, 2028 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
11 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
December 2025Nitrogen, ammonia total [as N], daily maximum4.54≤ 3.9 mg/L16%
May 2026pH, daily minimum6.4≥ 6.5 SU—
July 2026Oxygen, dissolved [DO], daily minimum4.71≥ 5 mg/L6%

Limits in force (70)

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≤ 83 lb/dall year
Solids, total suspended7-day average≤ 124 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, ammonia total [as N]30-day average≤ 5.8 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 1.8 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 3.9 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 2.1 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 3.9 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 1.3 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 5.2 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 2.7 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 1.5 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 2.7 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 1.1 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 8.4 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 3.9 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 4.7 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 3.9 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 19.9 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 16 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 5 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 10.7 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 5.8 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 10.7 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 3.7 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 14.2 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 2.7 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 7.3 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 4.1 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 7.3 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 3 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 23.1 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 8.8 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 10.7 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 13 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 10.7 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 8.8 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 54.7 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 7.3 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 7.3 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 7.3 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 7.3 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 8.8 lb/dJul
E. coligeometric mean≤ 630 #/100mLMar–Nov
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≤ 69 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 110 lb/dall year

How strict are these limits?

Cited limits by parameter: Iowa's rules and the federal ones.

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/IA0033367 · MCP: https://passage-data.com/mcp