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City of Iowa City

Sewage treatment plant, major discharger, Iowa City, Iowa. NPDES permit IA0070866, in force until Jul 31, 2030. Last 12 months: over a limit 2 times (last May 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (40 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
6 values over a limit, 0 required values missing, 0 of 19 reports late

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

Period endingParameterReportedLimit
December 2025pH, daily minimum6.21≥ 6.3 SU
May 2026pH, daily maximum734≤ 9 SU

Limits in force (103)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]daily minimum≥ 2.3 mg/LDec001
Oxygen, dissolved [DO]daily minimum≥ 5 mg/LJun001
Oxygen, dissolved [DO]daily minimum≥ 5 mg/LMay001
Oxygen, dissolved [DO]daily minimum≥ 5 mg/LOct001
Oxygen, dissolved [DO]daily minimum≥ 5 mg/LSep001
Oxygen, dissolved [DO]daily minimum≥ 2.3 mg/LJan001
Oxygen, dissolved [DO]daily minimum≥ 5 mg/LJul001
Oxygen, dissolved [DO]daily minimum≥ 2.4 mg/LNov001
Oxygen, dissolved [DO]daily minimum≥ 5 mg/LAug001
Oxygen, dissolved [DO]daily minimum≥ 2.3 mg/LFeb001
Oxygen, dissolved [DO]daily minimum≥ 2.3 mg/LMar001
Oxygen, dissolved [DO]daily minimum≥ 5 mg/LApr001
BOD, 5-day, 20 deg. C30-day averagereport only (mg/L)all year001
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year001
BOD, 5-day, 20 deg. C30-day averagereport only (lb/d)all year001
BOD, 5-day, 20 deg. Cdaily maximumreport only (lb/d)all year001
pHdaily minimum≥ 6.3 SUall year001
pHdaily maximum≤ 9 SUall year001
pH30-day averagereport only (SU)all year001
pHdaily maximumreport only (SU)all year001
Solids, total suspended30-day average≤ 30 mg/Lall year001
Solids, total suspended7-day average≤ 45 mg/Lall year001
Solids, total suspended30-day average≤ 6055 lb/dall year001
Solids, total suspended7-day average≤ 9082 lb/dall year001
Solids, total suspended30-day averagereport only (mg/L)all year001
Solids, total suspendeddaily maximumreport only (mg/L)all year001
Solids, total suspended30-day averagereport only (lb/d)all year001
Solids, total suspendeddaily maximumreport only (lb/d)all year001
Nitrogen, total [as N]30-day averagereport only (mg/L)all year001
Nitrogen, total [as N]daily maximumreport only (mg/L)all year001
Nitrogen, total [as N]30-day averagereport only (lb/d)all year001
Nitrogen, total [as N]daily maximumreport only (lb/d)all year001
Nitrogen, ammonia total [as N]30-day average≤ 4.2 mg/LAug001
Nitrogen, ammonia total [as N]30-day average≤ 15.1 mg/LFeb001
Nitrogen, ammonia total [as N]30-day average≤ 9 mg/LDec001
Nitrogen, ammonia total [as N]30-day average≤ 5.7 mg/LOct001
Nitrogen, ammonia total [as N]30-day average≤ 5.2 mg/LApr001
Nitrogen, ammonia total [as N]30-day average≤ 3.8 mg/LSep001
Nitrogen, ammonia total [as N]30-day average≤ 12.8 mg/LJan001
Nitrogen, ammonia total [as N]30-day average≤ 8.3 mg/LMar001
Nitrogen, ammonia total [as N]30-day average≤ 3.7 mg/LJun001
Nitrogen, ammonia total [as N]30-day average≤ 4.7 mg/LMay001
Nitrogen, ammonia total [as N]30-day average≤ 8 mg/LNov001
Nitrogen, ammonia total [as N]30-day average≤ 4.1 mg/LJul001
Nitrogen, ammonia total [as N]daily maximum≤ 26.6 mg/LAug001
Nitrogen, ammonia total [as N]daily maximum≤ 43.1 mg/LFeb001
Nitrogen, ammonia total [as N]daily maximum≤ 44.6 mg/LDec001
Nitrogen, ammonia total [as N]daily maximum≤ 49.4 mg/LOct001
Nitrogen, ammonia total [as N]daily maximum≤ 41.1 mg/LApr001
Nitrogen, ammonia total [as N]daily maximum≤ 34.1 mg/LSep001
Nitrogen, ammonia total [as N]daily maximum≤ 41.2 mg/LJan001
Nitrogen, ammonia total [as N]daily maximum≤ 41.3 mg/LMar001
Nitrogen, ammonia total [as N]daily maximum≤ 33.8 mg/LJun001
Nitrogen, ammonia total [as N]daily maximum≤ 39.3 mg/LMay001
Nitrogen, ammonia total [as N]daily maximum≤ 42.9 mg/LNov001
Nitrogen, ammonia total [as N]daily maximum≤ 25.8 mg/LJul001
Nitrogen, ammonia total [as N]30-day average≤ 782 lb/dAug001
Nitrogen, ammonia total [as N]30-day average≤ 2788 lb/dFeb001
Nitrogen, ammonia total [as N]30-day average≤ 1666 lb/dDec001
Nitrogen, ammonia total [as N]30-day average≤ 1054 lb/dOct001
Nitrogen, ammonia total [as N]30-day average≤ 962 lb/dApr001
Nitrogen, ammonia total [as N]30-day average≤ 715 lb/dSep001
Nitrogen, ammonia total [as N]30-day average≤ 2362 lb/dJan001
Nitrogen, ammonia total [as N]30-day average≤ 1530 lb/dMar001
Nitrogen, ammonia total [as N]30-day average≤ 687 lb/dJun001
Nitrogen, ammonia total [as N]30-day average≤ 879 lb/dMay001
Nitrogen, ammonia total [as N]30-day average≤ 1476 lb/dNov001
Nitrogen, ammonia total [as N]30-day average≤ 757 lb/dJul001
Nitrogen, ammonia total [as N]daily maximum≤ 2341 lb/dAug001
Nitrogen, ammonia total [as N]daily maximum≤ 8634.6 lb/dFeb001
Nitrogen, ammonia total [as N]daily maximum≤ 8947 lb/dDec001
Nitrogen, ammonia total [as N]daily maximum≤ 5470 lb/dOct001
Nitrogen, ammonia total [as N]daily maximum≤ 7669 lb/dApr001
Nitrogen, ammonia total [as N]daily maximum≤ 2906 lb/dSep001
Nitrogen, ammonia total [as N]daily maximum≤ 8271.6 lb/dJan001
Nitrogen, ammonia total [as N]daily maximum≤ 8277 lb/dMar001
Nitrogen, ammonia total [as N]daily maximum≤ 3007 lb/dJun001
Nitrogen, ammonia total [as N]daily maximum≤ 4864 lb/dMay001
Nitrogen, ammonia total [as N]daily maximum≤ 8605 lb/dNov001
Nitrogen, ammonia total [as N]daily maximum≤ 2321 lb/dJul001
Nitrogen, Kjeldahl, total [as N]30-day averagereport only (mg/L)all year001
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all year001
Nitrogen, Kjeldahl, total [as N]30-day averagereport only (lb/d)all year001
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (lb/d)all year001
Phosphorus, total [as P]30-day averagereport only (mg/L)all year001
Phosphorus, total [as P]daily maximumreport only (mg/L)all year001
Phosphorus, total [as P]30-day averagereport only (lb/d)all year001
Phosphorus, total [as P]daily maximumreport only (lb/d)all year001
E. coligeometric mean≤ 126 #/100mLMar–Nov001
Toxicity [acute], Ceriodaphnia dubiadaily maximum≤ 1 N=0;Y=1all year001
Toxicity [acute], Pimephales promelas [Fathead Minnow]daily maximum≤ 1 N=0;Y=1all year001
BOD, carbonaceous [5 day, 20 C]30-day average≤ 25 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]7-day average≤ 40 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]30-day average≤ 5046 lb/dall year001
BOD, carbonaceous [5 day, 20 C]7-day average≤ 8073 lb/dall year001
Nitrogen, total [as N]30-day averagereport only (mg/L)all year003
Nitrogen, total [as N]daily maximumreport only (mg/L)all year003
Nitrogen, total [as N]30-day averagereport only (lb/d)all year003
Nitrogen, total [as N]daily maximumreport only (lb/d)all year003
Phosphorus, total [as P]30-day averagereport only (mg/L)all year003
Phosphorus, total [as P]daily maximumreport only (mg/L)all year003
Phosphorus, total [as P]30-day averagereport only (lb/d)all year003
Phosphorus, total [as P]daily maximumreport only (lb/d)all year003

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/IA0070866 · MCP: https://passage-data.com/mcp