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City of Sheffield

Sewage treatment plant, Sheffield, Iowa. NPDES permit IA0036005, in force until Sep 30, 2031. Last 12 months: over a limit 11 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Last report on file
August 2026
Oct 2024 – Sep 2025
15 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
October 2025Solids, total suspended, 30-day average44≤ 30 mg/L47%
October 2025Solids, total suspended, 7-day average50≤ 45 mg/L11%
April 2026Solids, total suspended, 30-day average30.5≤ 30 mg/L2%
May 2026Solids, total suspended, 30-day average39≤ 30 mg/L30%
May 2026Solids, total suspended, 7-day average49≤ 45 mg/L9%
May 2026pH, daily maximum12.54≤ 9 SU—
June 2026Solids, total suspended, 30-day average43≤ 30 mg/L43%
June 2026Solids, total suspended, 7-day average50≤ 45 mg/L11%
July 2026Solids, total suspended, 30-day average36.75≤ 30 mg/L23%
August 2026Solids, total suspended, 30-day average39≤ 30 mg/L30%
August 2026Solids, total suspended, 7-day average72≤ 45 mg/L60%

Limits in force (62)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimum≥ 5 mg/Lall year
pHdaily minimum≥ 6.5 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspended30-day average≤ 30 mg/Lall year
Solids, total suspended7-day average≤ 45 mg/Lall year
Solids, total suspended30-day average≤ 222 lb/dall year
Solids, total suspended7-day average≤ 333 lb/dall year
Nitrogen, total [as N]30-day average≤ 47.7 lb/dall year
Nitrogen, total [as N]daily maximum≤ 78.1 lb/dall year
Nitrogen, ammonia total [as N]30-day average≤ 6.9 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 2.5 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 3.5 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 6.8 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 1.9 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 8 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 2 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 4.7 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 3.1 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 3.1 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 5 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 2.1 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 18.6 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 9.2 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 9.2 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 9.7 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 9.2 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 10.3 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 9.3 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 9.2 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 9.2 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 9.4 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 9.4 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 9.4 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 30.3 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 10.9 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 15.5 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 30.2 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 8.5 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 35.1 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 8.9 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 20.7 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 13.5 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 13.8 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 22 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 9.4 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 136.8 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 63.5 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 63.5 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 64.1 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 63.4 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 65 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 63.6 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 63.5 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 63.5 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 63.8 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 63.8 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 63.8 lb/dSep
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≤ 185 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 296 lb/dall year

How strict are these limits?

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

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Your permit document is the final word. As JSON: /api/v1/permits/IA0036005 · MCP: https://passage-data.com/mcp