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City of Independence

Sewage treatment plant, major discharger, Independence, Iowa. NPDES permit IA0036510 expired Sep 30, 2025; its limits still apply. Last 12 months: over a limit 2 times (last May 2026), 8 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (70 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
3 values over a limit, 1 required value missing, 0 of 12 reports late

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

Period endingParameterReportedLimitOver by
May 2026Copper, total [as Cu], daily maximum.0923≤ .02781 mg/L232%
May 2026Copper, total [as Cu], daily maximum1.05514≤ .9111 lb/d16%

Limits in force (114)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimum≥ 2.3 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≥ 6.2 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≤ 1001 lb/dall year
Solids, total suspended7-day average≤ 1501 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, 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≤ 10.1 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ 6 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 2 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 3.7 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 8.8 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 2.2 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 3.2 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 4 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 5.1 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 2.5 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 2.3 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 6.4 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 15 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 15.4 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 17.4 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 16.4 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 16 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 18.8 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 16 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 16.6 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 15.4 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 17.6 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 15.4 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 16.7 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 317.9 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 188.5 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 64.5 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 119.2 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 276.4 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 70.7 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 103.1 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 126.4 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 163.1 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 81.4 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 72.3 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 200.3 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 499.1 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 513.2 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 577.7 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 547.3 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 531 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 625.4 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 533.4 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 553.9 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 512.3 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 583.6 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 511.5 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 555.4 lb/dDec
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
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
Cyanide, total [as CN]30-day average≤ .008959 mg/Lall year
Cyanide, total [as CN]daily maximum≤ .02289 mg/Lall year
Cyanide, total [as CN]30-day average≤ .2299 lb/dall year
Cyanide, total [as CN]daily maximum≤ .7472 lb/dall year
Chromium, hexavalent [as Cr]30-day average≤ .01664 mg/Lall year
Chromium, hexavalent [as Cr]daily maximum≤ .01664 mg/Lall year
Chromium, hexavalent [as Cr]30-day average≤ .4863 lb/dall year
Chromium, hexavalent [as Cr]daily maximum≤ .5434 lb/dall year
Copper, total [as Cu]30-day average≤ .02601 mg/Lall year
Copper, total [as Cu]daily maximum≤ .02781 mg/Lall year
Copper, total [as Cu]30-day average≤ .7 lb/dall year
Copper, total [as Cu]daily maximum≤ .9111 lb/dall year
Aluminum, total [as Al]30-day average≤ .199 mg/Lall year
Aluminum, total [as Al]daily maximum≤ .8412 mg/Lall year
Aluminum, total [as Al]30-day average≤ 4.584 lb/dall year
Aluminum, total [as Al]daily maximum≤ 26.39 lb/dall year
Chlorine, total residual30-day average≤ .036 mg/Lall year
Chlorine, total residualdaily maximum≤ .042 mg/Lall year
Chlorine, total residual30-day average≤ .818 lb/dall year
Chlorine, total residualdaily maximum≤ 1.336 lb/dall year
E. coligeometric mean≤ 130 #/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≤ 834 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 1334 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/IA0036510 · MCP: https://passage-data.com/mcp