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City of Alton

Sewage treatment plant, Alton, Iowa. NPDES permit IA0028932, in force until Apr 30, 2029. Last 12 months: over a limit once (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
2 values over a limit, 2 required values missing, 0 of 12 reports late

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

Period endingParameterReportedLimitOver by
October 2025Chloride [as Cl], 30-day average402≤ 398 mg/L1%

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 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≤ 4 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 4.9 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 1.3 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 5 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 4.2 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 1.2 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 1.2 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 3.9 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 3.9 mg/LMar
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/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 4 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 8.5 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 5.3 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 20 mg/LJan
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/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 3.9 mg/LMar
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/LMay
Nitrogen, ammonia total [as N]30-day average≤ 80 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 97.6 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 26.1 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 100.3 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 84.3 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 23.6 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 24.8 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 78.5 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 78.9 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 55.3 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 55.3 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 78.4 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 80 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 170 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 53.9 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 106.1 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 401 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 54 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 65.1 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 78.5 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 78.9 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 55.3 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 55.3 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 78.4 lb/dMay
Chloride [as Cl]30-day average≤ 398 mg/Lall year
Chloride [as Cl]daily maximum≤ 630 mg/Lall year
Chloride [as Cl]30-day average≤ 7998 lb/dall year
Chloride [as Cl]daily maximum≤ 12660 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

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

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