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City of Sioux City

Sewage treatment plant, major discharger, Sioux City, Iowa. NPDES permit IA0043095, in force until Jan 31, 2031. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (45 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 12 reports late

Limits in force (89)

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 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≤ 4404 lb/dall year
Solids, total suspended7-day average≤ 6605 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
Oil & Grease30-day average≤ 10 mg/Lall year
Oil & Greasedaily maximum≤ 15 mg/Lall year
Nitrogen, total [as N]30-day averagereport only (mg/L)all year
Nitrogen, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, total [as N]30-day averagereport only (lb/d)all year
Nitrogen, total [as N]daily maximumreport only (lb/d)all year
Nitrogen, ammonia total [as N]30-day average≤ 38 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 37.7 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 25.3 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 21.5 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 21.8 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 43.8 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 50.7 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 39.9 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 42.1 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 60.3 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 54 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 22.4 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 43.5 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 48 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 44.8 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 51.5 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 49.5 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 43.8 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 53 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 43.6 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 42.1 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 60.3 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 54 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 47 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 5170 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 5122.4 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 3436 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 2924 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 2963 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 6413 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 6887 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 5415 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 6159 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 8249 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 7900 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 3045.5 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 6364 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 7013 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 6552 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 7532 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 7237 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 6413 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 7755 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 6380 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 6159 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 8818 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 7900 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 6870 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
Phosphorus, total [as P]30-day averagereport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]30-day averagereport only (lb/d)all year
Phosphorus, total [as P]daily maximumreport only (lb/d)all year
Chlorine, total residual30-day average≤ .068 mg/Lall year
Chlorine, total residualdaily maximum≤ .068 mg/Lall year
Chlorine, total residual30-day average≤ 9.35 lb/dall year
Chlorine, total residualdaily maximum≤ 9.35 lb/dall year
E. coligeometric mean≤ 126 #/100mLMar–Nov
Toxicity [acute], Ceriodaphnia dubiadaily maximum≤ 1 N=0;Y=1all year
Toxicity [acute], Pimephales promelas [Fathead Minnow]daily maximum≤ 1 N=0;Y=1all 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
BOD, carbonaceous [5 day, 20 C]30-day average≤ 3670 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 5871 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

Your permit document is the final word. As JSON: /api/v1/permits/IA0043095 · MCP: https://passage-data.com/mcp