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City of Garnavillo

Sewage treatment plant, Garnavillo, Iowa. NPDES permit IA0026697, in force until Aug 31, 2031. Last 12 months: over a limit 3 times (last April 2026), 6 required values missing. Source: EPA ECHO, Oct 22, 2026.

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

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

Period endingParameterReportedLimit
December 2025pH, daily maximum9.67≤ 9 SU
January 2026pH, daily maximum10.45≤ 9 SU
April 2026pH, daily maximum9.98≤ 9 SU

Limits in force (59)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimum≥ 1 mg/Lall year
pHdaily minimum≥ 6 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
Solids, total suspended30-day average≤ 129 lb/dall year
Solids, total suspended7-day average≤ 194 lb/dall year
Nitrogen, ammonia total [as N]30-day average≤ 18 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 15 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 16 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 32 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 25 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 32 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 15 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 15 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 15 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 15 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 15 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 36 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 30 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 25 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 25 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 50 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 30 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 50 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 25 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 20 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 20 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 25 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 20 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 40 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 25 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 10 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 30 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 30 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 20 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 25 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 15 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 30 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 15 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 15 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 20 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 35 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 50 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 40 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 50 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 60 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 40 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 40 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 40 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 50 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 40 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 40 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 40 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 60 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
BOD, carbonaceous [5 day, 20 C]30-day average≤ 40 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 65 lb/dall year

New limits from Jan 1, 2031

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Nitrogen, ammonia total [as N], 30-day average4.5 lb/d (Jan)tighter——
Nitrogen, ammonia total [as N], 30-day average4 mg/L (Jan)tighter——
Nitrogen, ammonia total [as N], 30-day average4.5 lb/d (Mar)tighter——
Nitrogen, ammonia total [as N], 30-day average4 mg/L (Mar)tighter——
Nitrogen, ammonia total [as N], 30-day average2.9 mg/L (Apr)tighter——
Nitrogen, ammonia total [as N], 30-day average3.3 lb/d (Apr)tighter——
Nitrogen, ammonia total [as N], 30-day average2.9 mg/L (Oct)tighter——
Nitrogen, ammonia total [as N], 30-day average2 mg/L (Sep)tighter——
Nitrogen, ammonia total [as N], 30-day average2.3 lb/d (Sep)tighter——
Nitrogen, ammonia total [as N], 30-day average3.9 lb/d (Dec)tighter——
Nitrogen, ammonia total [as N], 30-day average3.3 lb/d (Oct)tighter——
Nitrogen, ammonia total [as N], 30-day average3.4 mg/L (Dec)tighter——
Nitrogen, ammonia total [as N], 30-day average2.5 mg/L (Jun)tighter——
Nitrogen, ammonia total [as N], 30-day average2.8 lb/d (Jun)tighter——
Nitrogen, ammonia total [as N], 30-day average2.2 lb/d (Jul)tighter——
Nitrogen, ammonia total [as N], 30-day average1.9 mg/L (Jul)tighter——
Nitrogen, ammonia total [as N], 30-day average4.4 lb/d (Nov)tighter——
Nitrogen, ammonia total [as N], 30-day average2.9 mg/L (Nov)tighter——
Nitrogen, ammonia total [as N], 30-day average2.1 lb/d (Aug)tighter——
Nitrogen, ammonia total [as N], 30-day average1.8 mg/L (Aug)tighter——
Nitrogen, ammonia total [as N], 30-day average4.5 lb/d (Feb)tighter——
Nitrogen, ammonia total [as N], 30-day average4 mg/L (Feb)tighter——
Nitrogen, ammonia total [as N], 30-day average2.9 mg/L (May)tighter——
Nitrogen, ammonia total [as N], 30-day average3.3 lb/d (May)tighter——
Nitrogen, ammonia total [as N], daily maximum24.9 lb/d (Jan)tighter——
Nitrogen, ammonia total [as N], daily maximum18.6 mg/L (Jan)tighter——
Nitrogen, ammonia total [as N], daily maximum4.2 mg/L (Mar)tighter——
Nitrogen, ammonia total [as N], daily maximum6.5 lb/d (Mar)tighter——
Nitrogen, ammonia total [as N], daily maximum7.6 lb/d (Apr)tighter——
Nitrogen, ammonia total [as N], daily maximum4.9 mg/L (Apr)tighter——
Nitrogen, ammonia total [as N], daily maximum2.9 mg/L (Oct)tighter——
Nitrogen, ammonia total [as N], daily maximum6.3 lb/d (Dec)tighter——
Nitrogen, ammonia total [as N], daily maximum4.1 mg/L (Dec)tighter——
Nitrogen, ammonia total [as N], daily maximum4.4 lb/d (Sep)tighter——
Nitrogen, ammonia total [as N], daily maximum4.4 lb/d (Oct)tighter——
Nitrogen, ammonia total [as N], daily maximum2.9 mg/L (Sep)tighter——
Nitrogen, ammonia total [as N], daily maximum5.3 lb/d (Jun)tighter——
Nitrogen, ammonia total [as N], daily maximum3.5 mg/L (Jun)tighter——
Nitrogen, ammonia total [as N], daily maximum5.3 lb/d (Jul)tighter——
Nitrogen, ammonia total [as N], daily maximum3.5 mg/L (Jul)tighter——
Nitrogen, ammonia total [as N], daily maximum2.9 mg/L (Nov)tighter——
Nitrogen, ammonia total [as N], daily maximum4.4 lb/d (Nov)tighter——
Nitrogen, ammonia total [as N], daily maximum4.5 lb/d (Aug)tighter——
Nitrogen, ammonia total [as N], daily maximum2.9 mg/L (Aug)tighter——
Nitrogen, ammonia total [as N], daily maximum11.6 lb/d (Feb)tighter——
Nitrogen, ammonia total [as N], daily maximum8.8 mg/L (Feb)tighter——
Nitrogen, ammonia total [as N], daily maximum3.5 mg/L (May)tighter——
Nitrogen, ammonia total [as N], daily maximum5.2 lb/d (May)tighter——

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

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