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City of Sibley

Sewage treatment plant, Sibley, Iowa. NPDES permit IA0032841, in force until Sep 30, 2030. Last 12 months: over a limit once (last October 2025). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (15 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
1 value over a limit, 14 required values missing, 1 of 12 reports late

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

Period endingParameterReportedLimit
October 2025pH, daily maximum9.2≤ 9 SU

Limits in force (59)

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≤ 1.7 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 3.4 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 1.4 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 3.4 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 1.6 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 1.1 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 2.5 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 1.9 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 4 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 2.3 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 4.7 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 3.9 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 1.3 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 19.9 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 3.9 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 8.4 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 1.3 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 101.8 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 210.8 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 87.5 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 62.2 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 210.9 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 96.3 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 65.4 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 153.2 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 116.2 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 244.6 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 143.7 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 59.1 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 289.9 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 238.5 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 197.2 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 79.8 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 1221.2 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 162.9 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 162.9 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 238.5 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 197.2 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 516.3 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 162.9 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 79.8 lb/dAug
Chloride [as Cl]30-day average≤ 389 mg/Lall year
Chloride [as Cl]daily maximum≤ 629 mg/Lall year
Chloride [as Cl]30-day average≤ 23904 lb/dall year
Chloride [as Cl]daily maximum≤ 38609 lb/dall year
E. coligeometric mean≤ 274 #/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/IA0032841 · MCP: https://passage-data.com/mcp