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City of Audubon

Sewage treatment plant, Audubon, Iowa. NPDES permit IA0035203, in force until Dec 31, 2028. Last 12 months: over a limit once (last August 2026), 1 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (34 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
2 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
August 2026Oxygen, dissolved [DO], daily minimum4.06≥ 5 mg/L19%

Limits in force (78)

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≤ 242 lb/dall year
Solids, total suspended7-day average≤ 363 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≤ 3 mg/LDec
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≤ 2.9 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 1.6 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 1.3 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 2.1 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 4.2 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 1.9 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 1.9 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 1.2 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 4.9 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 16 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 15.2 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 9.2 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 14.7 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 11.7 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 10.7 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 15.2 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 14.7 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 15.7 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 15.7 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 9 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 14.2 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 21.3 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 29.3 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 8.2 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 20 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 11.3 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 9.1 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 14.9 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 29.2 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 13.4 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 13.1 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 8.6 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 34 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 128.7 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 122.5 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 74.2 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 118.4 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 94.4 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 86.3 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 122.5 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 118.4 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 126.6 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 126.6 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 72.6 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 114.5 lb/dFeb
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
Chloride [as Cl]30-day average≤ 389 mg/Lall year
Chloride [as Cl]daily maximum≤ 629 mg/Lall year
Chloride [as Cl]30-day average≤ 3134 lb/dall year
Chloride [as Cl]daily maximum≤ 5072 lb/dall year
E. coligeometric mean≤ 630 #/100mLMar–Nov
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≤ 202 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 323 lb/dall year

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

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