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City of Wyoming

Sewage treatment plant, Wyoming, Iowa. NPDES permit IA0032646 expired Oct 31, 2026. Last 12 months: over a limit 13 times (last April 2026), 4 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (30 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 1 of 12 reports late

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

All 13 values over a limit
Period endingParameterReportedLimitOver by
October 2025Nitrogen, ammonia total [as N], 30-day average6.135≤ 4.7 mg/L31%
October 2025Nitrogen, ammonia total [as N], daily maximum15.1≤ 4.7 mg/L221%
November 2025Nitrogen, ammonia total [as N], 30-day average9.3025≤ 4.3 mg/L116%
November 2025Nitrogen, ammonia total [as N], daily maximum13.4≤ 4.3 mg/L212%
December 2025Nitrogen, ammonia total [as N], daily maximum7.84≤ 5.9 mg/L33%
February 2026Nitrogen, ammonia total [as N], 30-day average14.525≤ 10.5 mg/L38%
February 2026Nitrogen, ammonia total [as N], daily maximum16.9≤ 10.5 mg/L61%
March 2026Nitrogen, ammonia total [as N], 30-day average13.4≤ 6.4 mg/L109%
March 2026Nitrogen, ammonia total [as N], daily maximum14.8≤ 6.4 mg/L131%
April 2026Nitrogen, ammonia total [as N], 30-day average18.64508≤ 15.5 lb/d20%
April 2026Nitrogen, ammonia total [as N], 30-day average7.3875≤ 6.3 mg/L17%
April 2026Nitrogen, ammonia total [as N], daily maximum11.5≤ 6.3 mg/L83%
April 2026Nitrogen, ammonia total [as N], daily maximum36.34818≤ 19.8 lb/d84%

Limits in force (74)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimum≥ 2.1 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≥ 6.3 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≤ 109 lb/dall year
Solids, total suspended7-day average≤ 163 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≤ 4.7 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 5.9 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 4.8 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 4.5 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 4.8 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 6.3 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 4.3 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 8.7 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 6.4 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 4.1 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 4.7 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 10.5 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 4.7 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 5.9 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 4.8 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 4.8 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 5 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 6.3 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 4.3 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 8.7 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 6.4 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 4.1 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 4.7 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 10.5 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 10.7 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 17.6 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 14.4 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 10.3 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 10.2 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 15.5 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 12.5 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 28.1 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 18.5 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 9.7 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 13.2 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 34 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 13.2 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 17.6 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 14.4 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 14.4 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 14.7 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 19.8 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 12.5 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 28.1 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 18.5 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 12.1 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 13.2 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 34 lb/dFeb
Chlorine, total residual30-day average≤ .024 mg/Lall year
Chlorine, total residualdaily maximum≤ .024 mg/Lall year
Chlorine, total residual30-day average≤ .058 lb/dall year
Chlorine, total residualdaily maximum≤ .073 lb/dall year
E. coligeometric mean≤ 126 #/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≤ 90 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 145 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

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