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City of Davenport

Sewage treatment plant, Davenport, Iowa. NPDES permit IA0076261, in force until Jan 31, 2028. Last 12 months: over a limit 2 times (last November 2025). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (11 values)
Renewal application due
Aug 4, 2027 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
0 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
November 2025Nitrogen, ammonia total [as N], 30-day average4.62≤ 3.5 mg/L32%
November 2025Nitrogen, ammonia total [as N], daily maximum8.12≤ 4.8 mg/L69%

Limits in force (55)

ParameterStatisticLimitMonths
pHdaily minimum≥ 6 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≤ 3.8 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 4.9 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 2.4 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 4.3 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 5.9 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 5.7 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 1.5 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 1.6 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 5.1 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 3.5 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 1.4 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 5 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 4.8 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 5.3 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 4.8 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 6.5 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 8.6 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 6.5 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 6 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 4.9 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 7.1 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 4.8 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 6 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 7.1 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 7.5 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 9.9 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 4.8 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 8.6 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 11.8 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 11.3 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 3.1 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 3.2 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 10.2 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 7.1 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 2.9 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 10.1 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 9.6 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 10.7 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 9.7 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 13.1 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 17.1 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 13 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 11.9 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 9.8 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 14.1 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 9.6 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 11.9 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 14.2 lb/dMar
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

How strict are these limits?

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

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/IA0076261 · MCP: https://passage-data.com/mcp