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City of Dixon

Sewage treatment plant, Dixon, Iowa. NPDES permit IA0033022, in force until Mar 31, 2031. Last 12 months: over a limit 9 times (last June 2026), 3 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (11 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
5 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
May 2026BOD, carbonaceous [5 day, 20 C], 30-day average30≤ 25 mg/L20%
May 2026E. coli, geometric mean14500≤ 175 #/100mL8186%
May 2026Solids, total suspended, 30-day average144≤ 80 mg/L80%
May 2026Solids, total suspended, 7-day average144≤ 120 mg/L20%
June 2026BOD, carbonaceous [5 day, 20 C], 30-day average32≤ 25 mg/L28%
June 2026E. coli, geometric mean4960≤ 175 #/100mL2734%
June 2026Nitrogen, ammonia total [as N], 30-day average4.21≤ 3.4 mg/L24%
June 2026Nitrogen, ammonia total [as N], daily maximum4.21≤ 3.4 mg/L24%
June 2026Solids, total suspended, 30-day average112≤ 80 mg/L40%

Limits in force (55)

ParameterStatisticLimitMonths
pHdaily minimum≥ 6.5 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspended30-day average≤ 80 mg/Lall year
Solids, total suspended7-day average≤ 120 mg/Lall year
Nitrogen, ammonia total [as N]30-day average≤ 3.4 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 4 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 4.6 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 3.4 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 1.2 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 1.2 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 1.9 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 3.9 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 3 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 3.9 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 1.1 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 2.7 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 3.4 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 19.9 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 8.4 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 3.4 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 mg/LJul
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≤ 4.8 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 3.9 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 3.9 mg/LMar
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]30-day average≤ 12.6 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 14.9 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 17.3 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 12.6 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 4.4 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 4.6 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 7.2 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 14.7 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 11.4 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 14.6 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 4.2 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 10.1 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 12.6 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 74.6 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 31.6 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 12.6 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 12 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 9.9 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 10.1 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 18.2 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 14.7 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 14.6 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 9.9 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 10.1 lb/dNov
E. coligeometric mean≤ 175 #/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

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/IA0033022 · MCP: https://passage-data.com/mcp