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City of Ainsworth

Sewage treatment plant, Ainsworth, Iowa. NPDES permit IA0069183, in force until Apr 30, 2027. 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 (14 values)
Renewal application due
Nov 1, 2026 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
5 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
November 2025Chloride [as Cl], 30-day average435≤ 389 mg/L12%
November 2025Nitrogen, ammonia total [as N], 30-day average4.85≤ 2.7 mg/L80%
November 2025Nitrogen, ammonia total [as N], daily maximum5.3≤ 2.7 mg/L96%
May 2026Chloride [as Cl], 30-day average460≤ 389 mg/L18%

Limits in force (58)

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≤ 1.3 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 5.8 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 1.8 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 1.5 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 2.1 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 1.1 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 2.7 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 5.2 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 3.9 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 2.7 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 3.9 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 8.4 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 4.7 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 19.9 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 3.9 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 3.9 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 6.7 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 29.1 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 9.2 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 4.9 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 7.4 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 10.5 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 5.4 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 13.3 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 25.9 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 19.4 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 13.3 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 19.4 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 16 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 42.1 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 16 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 13.3 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 13.3 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 23.6 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 16 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 13.3 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 99.5 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 19.4 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 13.3 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 19.4 lb/dMar
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≤ 1945 lb/dall year
Chloride [as Cl]daily maximum≤ 3147 lb/dall year
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 Apr 1, 2027

ParameterNew limitNew or tighterMedian, last 12 months× new limit
E. coli, geometric mean126 #/100mL (Mar–Nov)new——
Nitrogen, ammonia total [as N], 30-day average1.2 mg/L (Sep)tighter——
Nitrogen, ammonia total [as N], 30-day average5.8 lb/d (Sep)tighter——
Nitrogen, ammonia total [as N], 30-day average8.6 lb/d (Oct)tighter——
Nitrogen, ammonia total [as N], 30-day average1.7 mg/L (Oct)tighter——
Nitrogen, ammonia total [as N], 30-day average2.6 mg/L (Nov)tighter——
Nitrogen, ammonia total [as N], 30-day average12.8 lb/d (Nov)tighter——
Nitrogen, ammonia total [as N], 30-day average2.7 mg/L (Dec)tighter——
Nitrogen, ammonia total [as N], 30-day average13.7 lb/d (Dec)tighter——
Nitrogen, ammonia total [as N], 30-day average3.8 mg/L (Jan)tighter——
Nitrogen, ammonia total [as N], 30-day average18.9 lb/d (Jan)tighter——
Nitrogen, ammonia total [as N], 30-day average4.4 mg/L (Feb)tighter——
Nitrogen, ammonia total [as N], 30-day average21.9 lb/d (Feb)tighter——
Nitrogen, ammonia total [as N], 30-day average3.8 mg/L (Mar)tighter——
Nitrogen, ammonia total [as N], 30-day average18.8 lb/d (Mar)tighter——
Nitrogen, ammonia total [as N], daily maximum8.5 lb/d (Jul)tighter——
Nitrogen, ammonia total [as N], daily maximum1.7 mg/L (Jul)tighter——
Nitrogen, ammonia total [as N], daily maximum8.5 lb/d (Aug)tighter——
Nitrogen, ammonia total [as N], daily maximum1.7 mg/L (Aug)tighter——

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/IA0069183 · MCP: https://passage-data.com/mcp