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City of Knoxville

Sewage treatment plant, major discharger, Knoxville, Iowa. NPDES permit IA0035866 expired Jul 31, 2025; its limits still apply. Last 12 months: over a limit 5 times (last September 2026). 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, 0 required values missing, 0 of 12 reports late

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

Period endingParameterReportedLimitOver by
June 2026Copper, total [as Cu], daily maximum171.0041≤ .6887 lb/d24730%
June 2026Copper, total [as Cu], daily maximum6.15≤ .0269 mg/L22762%
September 2026Copper, total [as Cu], 30-day average1.426205≤ .4319 lb/d230%
September 2026Copper, total [as Cu], daily maximum.196≤ .0269 mg/L629%
September 2026Copper, total [as Cu], daily maximum5.409023≤ .6887 lb/d685%

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≤ 768 lb/dall year
Solids, total suspended7-day average≤ 1152 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≤ 1.1 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 3.4 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 3.4 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 2.5 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 1.7 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LJul
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≤ 1.3 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 2.3 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 4 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 4.2 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 13.2 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 13.8 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 11.8 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 6.4 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 3.5 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 5.8 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 9.3 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 4.6 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 3.4 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 8.3 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 14.2 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 27.1 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 87.2 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 87.2 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 63.4 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 44.5 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 25.7 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 39.8 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 39 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 33.5 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 24.4 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 59.4 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 101.2 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 102.4 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 322.6 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 348.2 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 286.8 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 156.2 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 87.1 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 143.4 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 225.3 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 112.7 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 84.5 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 207.4 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 363.5 lb/dFeb
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
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≤ 9951 lb/dall year
Chloride [as Cl]daily maximum≤ 16101 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≤ .4319 lb/dall year
Copper, total [as Cu]daily maximum≤ .6887 lb/dall year
E. coligeometric mean≤ 216 #/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≤ 640 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 1024 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/IA0035866 · MCP: https://passage-data.com/mcp