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City of Bennett

Sewage treatment plant, Bennett, Iowa. NPDES permit IA0021971, in force until Oct 31, 2030. Last 12 months: over a limit 6 times (last May 2026), 3 of 12 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
September 2026
Oct 2024 – Sep 2025
6 values over a limit, 0 required values missing, 1 of 12 reports late

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

Period endingParameterReportedLimitOver by
April 2026BOD, carbonaceous [5 day, 20 C], 30-day average61≤ 25 mg/L144%
April 2026BOD, carbonaceous [5 day, 20 C], 7-day average61≤ 40 mg/L53%
April 2026Solids, total suspended, 30-day average84≤ 80 mg/L5%
May 2026BOD, carbonaceous [5 day, 20 C], 30-day average32≤ 25 mg/L28%
May 2026Solids, total suspended, 30-day average350≤ 80 mg/L338%
May 2026Solids, total suspended, 7-day average350≤ 120 mg/L192%

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≤ 3.8 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 2.7 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 1.1 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 2.3 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 3.4 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 1.2 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 3.7 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 3.3 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 2.9 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 4.4 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 3.8 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 1.1 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 19.9 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 3.4 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 4 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 4.9 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 3.4 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 8.5 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 3.9 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 18.9 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 13.7 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 5.3 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 11.8 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 16.9 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 5.8 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 18.7 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 16.7 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 14.4 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 21.9 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 18.8 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 5.6 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 99.8 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 13.7 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 13.4 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 13.7 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 16.9 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 13.4 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 19.8 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 24.3 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 16.9 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 42.3 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 19.6 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 16.2 lb/dJul
E. coligeometric mean≤ 630 #/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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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/IA0021971 · MCP: https://passage-data.com/mcp