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City of West Liberty

Sewage treatment plant, major discharger, West Liberty, Iowa. NPDES permit IA0031691, in force until Jun 30, 2030. Last 12 months: over a limit 5 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (40 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
8 values over a limit, 0 required values missing, 1 of 12 reports late

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

Period endingParameterReportedLimitOver by
July 2026E. coli, geometric mean760.7577≤ 459 #/100mL66%
July 2026Nitrogen, ammonia total [as N], 30-day average1.58875≤ 1.2 mg/L32%
July 2026Nitrogen, ammonia total [as N], 30-day average23.86465≤ 21.1 lb/d13%
July 2026Nitrogen, ammonia total [as N], daily maximum136.6472≤ 108.7 lb/d26%
July 2026Nitrogen, ammonia total [as N], daily maximum8.79≤ 6.8 mg/L29%

Limits in force (84)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimum≥ 4.9 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≤ 552 lb/dall year
Solids, total suspended7-day average≤ 829 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≤ 4.8 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 2.1 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 2.8 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 3 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 4.2 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 1.2 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 4.2 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 1.9 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 1.6 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 1.2 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 1.9 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 1.3 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 14.3 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 12.3 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 14.7 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 16 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 14.8 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 6.8 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 15.3 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 15.8 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 8.6 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 6.8 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 12.7 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 8 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 83 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 36.5 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 48.8 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 52 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 71.4 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 21.1 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 71.7 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 32 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 27.5 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 20 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 32.7 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 22.2 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 262.6 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 195.4 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 271.4 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 294.9 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 271.5 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 108.7 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 280.8 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 280.2 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 138.2 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 106.9 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 193.5 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 127.2 lb/dSep
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
E. coligeometric mean≤ 459 #/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≤ 460 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 737 lb/dall year

New limits from Jun 1, 2030

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Phenols, 30-day average0.9536 lb/dnew——
Phenols, 30-day average0.05278 mg/Lnew——
Phenols, daily maximum2.511 mg/Lnew——
Phenols, daily maximum46.21 lb/dnew——

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/IA0031691 · MCP: https://passage-data.com/mcp