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City of Sac City

Sewage treatment plant, Sac City, Iowa. NPDES permit IA0033090 expired May 31, 2026; its limits still apply. Last 12 months: over a limit 4 times (last July 2026), 30 required values missing. Source: EPA ECHO, Oct 22, 2026.

Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 8 required values missing, 1 of 12 reports late

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

Period endingParameterReportedLimitOver by
July 2026Copper, total [as Cu], 30-day average3.11≤ .0289 mg/L10661%
July 2026Copper, total [as Cu], 30-day average3.709048≤ .1383 lb/d2582%
July 2026Copper, total [as Cu], daily maximum3.11≤ .0289 mg/L10661%
July 2026Copper, total [as Cu], daily maximum3.709048≤ .1629 lb/d2177%

Limits in force (80)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimum≥ 3.4 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≥ 6.4 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≤ 175 lb/dall year
Solids, total suspended7-day average≤ 263 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≤ 5.1 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 5.2 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 3.2 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 8.3 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 3.5 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 3.2 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 13.2 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 4.8 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 3.4 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 6.8 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 11.5 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 7.8 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 14.6 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 14.6 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 13.5 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 14.8 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 15.3 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 15.1 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 13.6 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 14.2 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 16.4 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 13.8 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 14.3 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 13.6 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 22.7 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 30.8 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 13.4 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 45.7 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 15.1 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 12.2 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 68.8 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 19.5 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 13.4 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 31.4 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 60.8 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 38.9 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 82.6 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 82.6 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 76.3 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 84 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 86.8 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 85.6 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 75.8 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 80.2 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 92.8 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 77.9 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 80.5 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 77.3 lb/dNov
Nitrogen, Kjeldahl, total [as N]30-day average≤ 140 lb/dall year
Nitrogen, Kjeldahl, total [as N]daily maximum≤ 230 lb/dall year
Copper, total [as Cu]30-day average≤ .0289 mg/Lall year
Copper, total [as Cu]daily maximum≤ .0289 mg/Lall year
Copper, total [as Cu]30-day average≤ .1383 lb/dall year
Copper, total [as Cu]daily maximum≤ .1629 lb/dall year
Chlorine, total residual30-day average≤ .017 mg/Lall year
Chlorine, total residualdaily maximum≤ .02 mg/Lall year
Chlorine, total residual30-day average≤ .076 lb/dall year
Chlorine, total residualdaily maximum≤ .115 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]7-day average≤ 40 mg/Lall year
BOD, carbonaceous [5 day, 20 C]30-day average≤ 146 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 234 lb/dall 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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