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City of Fairfield

Water Supply, Fairfield, Iowa. NPDES permit IA0082325, in force until Feb 28, 2031. Last 12 months: over a limit 4 times (last May 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (18 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 18 required values missing, 0 of 12 reports late

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

Period endingParameterReportedLimitOver by
May 2026Sulfate, total [as SO4], 30-day average1900≤ 1514 mg/L25%
May 2026Sulfate, total [as SO4], 30-day average2728.681≤ 2209 lb/d24%
May 2026Sulfate, total [as SO4], daily maximum1900≤ 1514 mg/L25%
May 2026Sulfate, total [as SO4], daily maximum2728.681≤ 2209 lb/d24%

Limits in force (62)

ParameterStatisticLimitMonths
pHdaily minimum≥ 6.5 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspended30-day average≤ 30 mg/Lall year
Solids, total suspendeddaily maximum≤ 45 mg/Lall year
Solids, total suspended30-day average≤ 43.8 lb/dall year
Solids, total suspendeddaily maximum≤ 65.7 lb/dall year
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 1.5 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 1.3 mg/LJun
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≤ 2.3 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 4 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 3.4 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 2.5 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 1.7 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 4.7 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 mg/LJun
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≤ 2.7 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 8.4 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 3.9 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LAug
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]30-day average≤ 1.5 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 2.2 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 1.9 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 5 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 2.3 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 1.5 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 3.4 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 5.8 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 5 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 1.4 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 3.6 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 2.5 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 4.7 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 6.9 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 4.7 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 29 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 3.9 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 3.9 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 3.9 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 12.3 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 5.7 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 3.9 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 5.7 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 4.7 lb/dMay
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≤ 567 lb/dall year
Chloride [as Cl]daily maximum≤ 918 lb/dall year
Sulfate, total [as SO4]30-day average≤ 1514 mg/Lall year
Sulfate, total [as SO4]daily maximum≤ 1514 mg/Lall year
Sulfate, total [as SO4]30-day average≤ 2209 lb/dall year
Sulfate, total [as SO4]daily maximum≤ 2209 lb/dall year

How strict are these limits?

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

Same industry: the 48 Water Supply permits in Iowa.

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Your permit document is the final word. As JSON: /api/v1/permits/IA0082325 · MCP: https://passage-data.com/mcp