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City of State Center

Sewage treatment plant, State Center, Iowa. NPDES permit IA0041807, in force until Oct 31, 2029. Last 12 months: over a limit 2 times (last October 2025). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (24 values)
Last report on file
September 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 endingParameterReportedLimitOver by
October 2025Solids, total suspended, 30-day average122.6666≤ 80 mg/L53%
October 2025Solids, total suspended, 7-day average313≤ 120 mg/L161%

Limits in force (68)

ParameterStatisticLimitMonths
BOD, 5-day, 20 deg. C30-day averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year
BOD, 5-day, 20 deg. C30-day averagereport only (lb/d)all year
BOD, 5-day, 20 deg. Cdaily maximumreport only (lb/d)all year
pHdaily minimum≥ 6.5 SUall year
pHdaily maximum≤ 9 SUall year
pH30-day averagereport only (SU)all year
pHdaily maximumreport only (SU)all year
Solids, total suspended30-day average≤ 80 mg/Lall year
Solids, total suspended7-day average≤ 120 mg/Lall year
Solids, total suspended30-day average≤ 310 lb/dall year
Solids, total suspended7-day average≤ 465 lb/dall year
Solids, total suspended30-day averagereport only (mg/L)all year
Solids, total suspendeddaily maximumreport only (mg/L)all year
Solids, total suspended30-day averagereport only (lb/d)all year
Solids, total suspendeddaily maximumreport only (lb/d)all year
Nitrogen, ammonia total [as N]30-day average≤ 11.5 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 10.9 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 19.6 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 14.2 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 16.9 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 11 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 17.4 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 13 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 22 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 11.6 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 25 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 14.5 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 13.2 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 15.5 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 45 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 36 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 37 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 11 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 18.9 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 20 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 54 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 13.3 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 64 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 25 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 25 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 23 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 48 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 30 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 42 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 33 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 37 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 28 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 53 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 34 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 59 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 37 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 54 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 63 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 100 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 76 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 84 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 45 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 76 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 76 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 119 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 54 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 141 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 70 lb/dNov
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≤ 97 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 155 lb/dall year

New limits from Feb 1, 2029

ParameterNew limitNew or tighterMedian, last 12 months× new limit
E. coli, geometric mean126 #/100mL (Mar–Nov)new——
Nitrogen, ammonia total [as N], 30-day average4 mg/L (Feb)tighter——
Nitrogen, ammonia total [as N], 30-day average15.3 lb/d (Feb)tighter——
Nitrogen, ammonia total [as N], 30-day average3.4 mg/L (Mar)tighter——
Nitrogen, ammonia total [as N], 30-day average13.2 lb/d (Mar)tighter——
Nitrogen, ammonia total [as N], 30-day average5.9 lb/d (Apr)tighter——
Nitrogen, ammonia total [as N], 30-day average1.5 mg/L (Apr)tighter——
Nitrogen, ammonia total [as N], 30-day average1 mg/L (Jul)tighter——
Nitrogen, ammonia total [as N], 30-day average3.9 lb/d (Jul)tighter——
Nitrogen, ammonia total [as N], 30-day average4.1 lb/d (Sep)tighter——
Nitrogen, ammonia total [as N], 30-day average1.1 mg/L (Sep)tighter——
Nitrogen, ammonia total [as N], 30-day average3.4 mg/L (Jan)tighter——
Nitrogen, ammonia total [as N], 30-day average2.5 mg/L (Dec)tighter——
Nitrogen, ammonia total [as N], 30-day average9.6 lb/d (Dec)tighter——
Nitrogen, ammonia total [as N], 30-day average13.2 lb/d (Jan)tighter——
Nitrogen, ammonia total [as N], 30-day average1 mg/L (Aug)tighter——
Nitrogen, ammonia total [as N], 30-day average3.7 lb/d (Aug)tighter——
Nitrogen, ammonia total [as N], 30-day average1.6 mg/L (Oct)tighter——
Nitrogen, ammonia total [as N], 30-day average6 lb/d (Oct)tighter——
Nitrogen, ammonia total [as N], 30-day average2.3 mg/L (Nov)tighter——
Nitrogen, ammonia total [as N], 30-day average9 lb/d (Nov)tighter——
Nitrogen, ammonia total [as N], 30-day average1.3 mg/L (Jun)tighter——
Nitrogen, ammonia total [as N], 30-day average5.1 lb/d (Jun)tighter——
Nitrogen, ammonia total [as N], 30-day average1.7 mg/L (May)tighter——
Nitrogen, ammonia total [as N], 30-day average6.7 lb/d (May)tighter——
Nitrogen, ammonia total [as N], daily maximum32.6 lb/d (Feb)tighter——
Nitrogen, ammonia total [as N], daily maximum8.4 mg/L (Feb)tighter——
Nitrogen, ammonia total [as N], daily maximum15.1 lb/d (Mar)tighter——
Nitrogen, ammonia total [as N], daily maximum3.9 mg/L (Mar)tighter——
Nitrogen, ammonia total [as N], daily maximum18.3 lb/d (Apr)tighter——
Nitrogen, ammonia total [as N], daily maximum4.7 mg/L (Apr)tighter——
Nitrogen, ammonia total [as N], daily maximum12.4 lb/d (Jul)tighter——
Nitrogen, ammonia total [as N], daily maximum3.2 mg/L (Jul)tighter——
Nitrogen, ammonia total [as N], daily maximum10.3 lb/d (Sep)tighter——
Nitrogen, ammonia total [as N], daily maximum2.7 mg/L (Sep)tighter——
Nitrogen, ammonia total [as N], daily maximum19.9 mg/L (Jan)tighter——
Nitrogen, ammonia total [as N], daily maximum77.1 lb/d (Jan)tighter——
Nitrogen, ammonia total [as N], daily maximum15.1 lb/d (Dec)tighter——
Nitrogen, ammonia total [as N], daily maximum3.9 mg/L (Dec)tighter——
Nitrogen, ammonia total [as N], daily maximum2.7 mg/L (Aug)tighter——
Nitrogen, ammonia total [as N], daily maximum10.3 lb/d (Aug)tighter——
Nitrogen, ammonia total [as N], daily maximum10.3 lb/d (Oct)tighter——
Nitrogen, ammonia total [as N], daily maximum2.7 mg/L (Oct)tighter——
Nitrogen, ammonia total [as N], daily maximum2.7 mg/L (Nov)tighter——
Nitrogen, ammonia total [as N], daily maximum10.3 lb/d (Nov)tighter——
Nitrogen, ammonia total [as N], daily maximum12.4 lb/d (Jun)tighter——
Nitrogen, ammonia total [as N], daily maximum3.2 mg/L (Jun)tighter——
Nitrogen, ammonia total [as N], daily maximum3.2 mg/L (May)tighter——
Nitrogen, ammonia total [as N], daily maximum12.4 lb/d (May)tighter——

How strict are these limits?

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

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