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City of Peosta

Sewage treatment plant, Peosta, Iowa. NPDES permit IA0075507, in force until Feb 28, 2027. Last 12 months: over a limit 3 times (last February 2026), 1 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (38 values)
Renewal application due
Sep 1, 2026 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
4 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
December 2025Nitrogen, ammonia total [as N], 30-day average10.58289≤ 9.1 lb/d16%
December 2025Nitrogen, ammonia total [as N], 30-day average7.307≤ 2.5 mg/L192%
February 2026Copper, total [as Cu], daily maximum.0285≤ .0269 mg/L6%

Limits in force (82)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimum≥ 5 mg/Lall year
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≤ 30 mg/Lall year
Solids, total suspended7-day average≤ 45 mg/Lall year
Solids, total suspended30-day average≤ 110 lb/dall year
Solids, total suspended7-day average≤ 166 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≤ 2.1 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 3.4 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 1.6 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 2.5 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 1.5 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 4 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 1.7 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 2.3 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 1.1 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 1.3 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 14.7 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 15.2 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 16.2 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 15.7 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 16 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 15.7 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 14.2 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 15.2 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 17.6 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 14.7 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 16.5 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 14.4 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 7.7 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 12.6 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 3.5 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 5.7 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 9.1 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 5.6 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 14.6 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 6.4 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 3.7 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 8.6 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 3.9 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 4.8 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 54.1 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 56 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 59.8 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 57.9 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 58.8 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 57.9 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 52.3 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 56 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 64.8 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 54.1 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 60.8 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 53.2 lb/dJun
Nitrogen, Kjeldahl, total [as N]30-day averagereport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]30-day averagereport only (lb/d)all year
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (lb/d)all year
Copper, total [as Cu]30-day average≤ .01687 mg/Lall year
Copper, total [as Cu]daily maximum≤ .0269 mg/Lall year
Copper, total [as Cu]30-day average≤ .06218 lb/dall year
Copper, total [as Cu]daily maximum≤ .09916 lb/dall year
Zinc, total [as Zn]30-day average≤ .2156 mg/Lall year
Zinc, total [as Zn]daily maximum≤ .2156 mg/Lall year
Zinc, total [as Zn]30-day average≤ .7946 lb/dall year
Zinc, total [as Zn]daily maximum≤ .7946 lb/dall year
E. coligeometric mean≤ 126 #/100mLMar–Nov
BOD, carbonaceous [5 day, 20 C]30-day average≤ 25 mg/Lall year
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 31 mg/Lall year
BOD, carbonaceous [5 day, 20 C]30-day average≤ 92 lb/dall year
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 114 lb/dall year

New limits from Feb 1, 2027

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Chloride [as Cl], 30-day average389 mg/Lnew403 mg/L (11 values)1.04×
Chloride [as Cl], 30-day average1433 lb/dnew702.4 lb/d (11 values)0.49×
Chloride [as Cl], daily maximum629 mg/Lnew403 mg/L (11 values)0.641×
Chloride [as Cl], daily maximum2318 lb/dnew702.4 lb/d (11 values)0.303×

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/IA0075507 · MCP: https://passage-data.com/mcp