Passage Data · Check a report · Use it from your AI

City of Aurora

Sewage treatment plant, Aurora, Iowa. NPDES permit IA0059412, in force until Mar 31, 2028. Last 12 months: over a limit 4 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (10 values)
Renewal application due
Oct 3, 2027 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
3 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
December 2025Nitrogen, ammonia total [as N], 30-day average6.325≤ 3.9 mg/L62%
December 2025Nitrogen, ammonia total [as N], daily maximum8.44≤ 3.9 mg/L116%
June 2026Nitrogen, ammonia total [as N], 30-day average3.23≤ 1.3 mg/L148%
June 2026Nitrogen, ammonia total [as N], daily maximum3.23≤ 3.2 mg/L1%

Limits in force (54)

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≤ 2.1 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 1.3 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 5.2 mg/LJan
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≤ 1.1 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 3.9 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 5.8 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 1.5 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 2.7 mg/LOct
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≤ 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≤ 3.2 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 3.9 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 8.4 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LOct
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≤ 5.6 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 3.6 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 13.8 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 4.9 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 2.6 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 2.9 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 10.4 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 15.5 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 4 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 7.1 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 7.1 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 10.4 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 12.6 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 8.5 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 53.1 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 8.5 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 7.1 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 8.5 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 10.4 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 22.4 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 7.1 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 7.1 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 7.1 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 10.4 lb/dMar
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 Mar 1, 2028

ParameterNew limitNew or tighterMedian, last 12 months× new limit
E. coli, geometric mean134 #/100mL (Mar–Nov)new——
Nitrogen, ammonia total [as N], 30-day average3.4 mg/L (Mar)tighter——
Nitrogen, ammonia total [as N], 30-day average9.1 lb/d (Mar)tighter——
Nitrogen, ammonia total [as N], 30-day average4 mg/L (Feb)tighter——
Nitrogen, ammonia total [as N], 30-day average2.5 lb/d (Aug)tighter——
Nitrogen, ammonia total [as N], 30-day average1.5 mg/L (Apr)tighter——
Nitrogen, ammonia total [as N], 30-day average4.1 lb/d (Apr)tighter——
Nitrogen, ammonia total [as N], 30-day average4.2 lb/d (Oct)tighter——
Nitrogen, ammonia total [as N], 30-day average1.6 mg/L (Oct)tighter——
Nitrogen, ammonia total [as N], 30-day average10.5 lb/d (Feb)tighter——
Nitrogen, ammonia total [as N], 30-day average6.2 lb/d (Nov)tighter——
Nitrogen, ammonia total [as N], 30-day average2.3 mg/L (Nov)tighter——
Nitrogen, ammonia total [as N], 30-day average3.5 lb/d (Jun)tighter——
Nitrogen, ammonia total [as N], 30-day average4.6 lb/d (May)tighter——
Nitrogen, ammonia total [as N], 30-day average1.7 mg/L (May)tighter——
Nitrogen, ammonia total [as N], 30-day average1.1 mg/L (Sep)tighter——
Nitrogen, ammonia total [as N], 30-day average2.8 lb/d (Sep)tighter——
Nitrogen, ammonia total [as N], 30-day average3.4 mg/L (Jan)tighter——
Nitrogen, ammonia total [as N], 30-day average9.1 lb/d (Jan)tighter——
Nitrogen, ammonia total [as N], 30-day average2.5 mg/L (Dec)tighter——
Nitrogen, ammonia total [as N], 30-day average6.6 lb/d (Dec)tighter——
Nitrogen, ammonia total [as N], 30-day average1 mg/L (Jul)tighter——
Nitrogen, ammonia total [as N], 30-day average2.7 lb/d (Jul)tighter——

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

· Save this facility as a site · Superfund sites nearby · Your permits on one board

On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/IA0059412 · MCP: https://passage-data.com/mcp