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City of Tripoli

Sewage treatment plant, Tripoli, Iowa. NPDES permit IA0033120, in force until May 31, 2031. Last 12 months: over a limit once (last May 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (25 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 1 of 12 reports late

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

Period endingParameterReportedLimit
May 2026pH, daily maximum9.09≤ 9 SU

Limits in force (69)

ParameterStatisticLimitMonths
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≤ 554 lb/dall year
Solids, total suspended7-day average≤ 831 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, ammonia total [as N]30-day average≤ 11.4 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 16.6 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 13.8 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 11.4 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 13.8 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 13.8 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 11.4 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 13.3 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 23.8 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 12.5 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 13.3 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 35.2 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 11.4 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 16.6 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 13.8 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 11.4 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 13.8 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 13.8 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 11.4 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 13.3 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 23.8 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 12.5 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 13.3 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 35.2 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 78.6 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 114.8 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 95.4 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 78.6 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 95.5 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 95.5 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 78.6 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 92.4 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 164.4 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 86.7 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 91.9 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 243.5 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 78.6 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 114.8 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 95.4 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 78.6 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 95.5 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 95.5 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 78.6 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 92.4 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 164.4 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 86.7 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 91.9 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 243.5 lb/dJan
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≤ 173 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 277 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/IA0033120 · MCP: https://passage-data.com/mcp