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City of Hudson

Sewage treatment plant, Hudson, Iowa. NPDES permit IA0027243, in force until Jul 31, 2028. Last 12 months: over a limit 5 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (37 values)
Renewal application due
Feb 2, 2028 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
2 values over a limit, 0 required values missing, 2 of 12 reports late

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

Period endingParameterReportedLimitOver by
April 2026Chlorine, total residual, 30-day average.358664≤ .228 lb/d57%
April 2026Chlorine, total residual, daily maximum.529173≤ .436 lb/d21%
April 2026Nitrogen, ammonia total [as N], 30-day average63.20982≤ 60.2 lb/d5%
August 2026Chlorine, total residual, 30-day average.365278≤ .228 lb/d60%
August 2026Chlorine, total residual, daily maximum.743094≤ .436 lb/d70%

Limits in force (81)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimum≥ 1.1 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 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≤ 80 mg/Lall year
Solids, total suspended7-day average≤ 120 mg/Lall year
Solids, total suspended30-day average≤ 400 lb/dall year
Solids, total suspended7-day average≤ 600 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 average≤ 108.7 lb/dall year
Nitrogen, total [as N]daily maximum≤ 177.9 lb/dall year
Nitrogen, ammonia total [as N]30-day average≤ 22.3 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 17.7 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 78.2 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 49.4 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 46.5 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 14.3 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 68.4 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 31 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 16.1 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 38.1 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 26.6 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 16.6 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 54.9 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 58.8 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 89.9 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 49.7 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 48.7 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 54.9 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 91.5 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 48.7 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 48.5 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 70.9 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 50.6 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 48.7 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 68.8 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 39.7 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 156.1 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 98.4 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 92.6 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 51.9 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 136.2 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 61.8 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 37.7 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 80.1 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 60.2 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 41.8 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 118.8 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 118.9 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 191.6 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 103.6 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 97.8 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 118.9 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 239.8 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 97.8 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 116.4 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 142.7 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 107.7 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 97.8 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
Chlorine, total residual30-day average≤ .11 mg/Lall year
Chlorine, total residualdaily maximum≤ .205 mg/Lall year
Chlorine, total residual30-day average≤ .228 lb/dall year
Chlorine, total residualdaily maximum≤ .436 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≤ 125 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 200 lb/dall year
Report due [yrmoda]daily maximum≤ 1 N=0;Y=1all year

How strict are these limits?

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

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Your permit document is the final word. As JSON: /api/v1/permits/IA0027243 · MCP: https://passage-data.com/mcp