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City of Granville

Sewage treatment plant, Granville, Iowa. NPDES permit IA0043486, in force until Aug 31, 2029. Last 12 months: over a limit 8 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (10 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
3 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
October 2025Nitrogen, ammonia total [as N], 30-day average3.935≤ 2.2 mg/L79%
October 2025Nitrogen, ammonia total [as N], 30-day average8.204475≤ 5 lb/d64%
October 2025Nitrogen, ammonia total [as N], daily maximum13.94865≤ 7.1 lb/d96%
October 2025Nitrogen, ammonia total [as N], daily maximum6.69≤ 3.1 mg/L116%
June 2026Nitrogen, ammonia total [as N], 30-day average4.465≤ 2.6 mg/L72%
June 2026Nitrogen, ammonia total [as N], 30-day average9.309525≤ 6.2 lb/d50%
June 2026Nitrogen, ammonia total [as N], daily maximum10.2165≤ 9.3 lb/d10%
June 2026Nitrogen, ammonia total [as N], daily maximum4.9≤ 4 mg/L23%

Limits in force (54)

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≤ 1.5 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 3 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 1.6 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 3.3 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 1.6 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 2.6 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 2.2 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 4.4 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 4.2 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 2.8 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 5.2 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 3.2 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 3.5 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 3 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 3.3 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 3.8 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 4.2 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 4 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 3.1 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 16.1 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 4.2 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 5.3 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 9 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 4.2 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 3.5 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 6.9 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 3.7 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 7.8 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 3.7 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 6.2 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 5 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 10.2 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 9.9 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 6.5 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 12 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 7.6 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 8.1 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 6.9 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 7.6 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 8.8 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 9.7 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 9.3 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 7.1 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 37.6 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 9.9 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 12.3 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 21.1 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 9.8 lb/dDec
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

New limits from Aug 1, 2029

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Chloride [as Cl], 30-day average409 mg/Lnew——
Chloride [as Cl], 30-day average955 lb/dnew——
Chloride [as Cl], daily maximum1477 lb/dnew——
Chloride [as Cl], daily maximum632 mg/Lnew——

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/IA0043486 · MCP: https://passage-data.com/mcp