CITY OF IOWA CITY

NPDES permit IA0070866 · Major POTW · effective, expires 2030-07-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file

EPA's record, 2025-09-01 to 2026-08-31

2values over a limit
0required values missing, on 0 form(s)
0of 16 forms filed late

Last period with anything received: 2026-07-31. Most often over: pH (2).

Reporting

Reports are due about 15 days after each monitoring period ends (the most common figure among IA permits in EPA's filings — check your permit).

Limits in force (103)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]DAILY MN >= 2.3 mg/L Dec
001Oxygen, dissolved [DO]DAILY MN >= 5 mg/L Jun
001Oxygen, dissolved [DO]DAILY MN >= 5 mg/L May
001Oxygen, dissolved [DO]DAILY MN >= 5 mg/L Oct
001Oxygen, dissolved [DO]DAILY MN >= 5 mg/L Sep
001Oxygen, dissolved [DO]DAILY MN >= 2.3 mg/L Jan
001Oxygen, dissolved [DO]DAILY MN >= 5 mg/L Jul
001Oxygen, dissolved [DO]DAILY MN >= 2.4 mg/L Nov
001Oxygen, dissolved [DO]DAILY MN >= 5 mg/L Aug
001Oxygen, dissolved [DO]DAILY MN >= 2.3 mg/L Feb
001Oxygen, dissolved [DO]DAILY MN >= 2.3 mg/L Mar
001Oxygen, dissolved [DO]DAILY MN >= 5 mg/L Apr
001BOD, 5-day, 20 deg. C30DA AVG report only all year
001BOD, 5-day, 20 deg. CDAILY MX report only all year
001BOD, 5-day, 20 deg. C30DA AVG report only all year
001BOD, 5-day, 20 deg. CDAILY MX report only all year
001pHDAILY MN >= 6.3 SU all year
001pHDAILY MX <= 9 SU all year
001pH30DA AVG report only all year
001pHDAILY MX report only all year
001Solids, total suspended30DA AVG <= 30 mg/L all year
001Solids, total suspended7 DA AVG <= 45 mg/L all year
001Solids, total suspended30DA AVG <= 6055 lb/d all year
001Solids, total suspended7 DA AVG <= 9082 lb/d all year
001Solids, total suspended30DA AVG report only all year
001Solids, total suspendedDAILY MX report only all year
001Solids, total suspended30DA AVG report only all year
001Solids, total suspendedDAILY MX report only all year
001Nitrogen, total [as N]30DA AVG report only all year
001Nitrogen, total [as N]DAILY MX report only all year
001Nitrogen, total [as N]30DA AVG report only all year
001Nitrogen, total [as N]DAILY MX report only all year
001Nitrogen, ammonia total [as N]30DA AVG <= 4.2 mg/L Aug
001Nitrogen, ammonia total [as N]30DA AVG <= 15.1 mg/L Feb
001Nitrogen, ammonia total [as N]30DA AVG <= 9 mg/L Dec
001Nitrogen, ammonia total [as N]30DA AVG <= 5.7 mg/L Oct
001Nitrogen, ammonia total [as N]30DA AVG <= 5.2 mg/L Apr
001Nitrogen, ammonia total [as N]30DA AVG <= 3.8 mg/L Sep
001Nitrogen, ammonia total [as N]30DA AVG <= 12.8 mg/L Jan
001Nitrogen, ammonia total [as N]30DA AVG <= 8.3 mg/L Mar
001Nitrogen, ammonia total [as N]30DA AVG <= 3.7 mg/L Jun
001Nitrogen, ammonia total [as N]30DA AVG <= 4.7 mg/L May
001Nitrogen, ammonia total [as N]30DA AVG <= 8 mg/L Nov
001Nitrogen, ammonia total [as N]30DA AVG <= 4.1 mg/L Jul
001Nitrogen, ammonia total [as N]DAILY MX <= 26.6 mg/L Aug
001Nitrogen, ammonia total [as N]DAILY MX <= 43.1 mg/L Feb
001Nitrogen, ammonia total [as N]DAILY MX <= 44.6 mg/L Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 49.4 mg/L Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 41.1 mg/L Apr
001Nitrogen, ammonia total [as N]DAILY MX <= 34.1 mg/L Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 41.2 mg/L Jan
001Nitrogen, ammonia total [as N]DAILY MX <= 41.3 mg/L Mar
001Nitrogen, ammonia total [as N]DAILY MX <= 33.8 mg/L Jun
001Nitrogen, ammonia total [as N]DAILY MX <= 39.3 mg/L May
001Nitrogen, ammonia total [as N]DAILY MX <= 42.9 mg/L Nov
001Nitrogen, ammonia total [as N]DAILY MX <= 25.8 mg/L Jul
001Nitrogen, ammonia total [as N]30DA AVG <= 782 lb/d Aug
001Nitrogen, ammonia total [as N]30DA AVG <= 2788 lb/d Feb
001Nitrogen, ammonia total [as N]30DA AVG <= 1666 lb/d Dec
001Nitrogen, ammonia total [as N]30DA AVG <= 1054 lb/d Oct
001Nitrogen, ammonia total [as N]30DA AVG <= 962 lb/d Apr
001Nitrogen, ammonia total [as N]30DA AVG <= 715 lb/d Sep
001Nitrogen, ammonia total [as N]30DA AVG <= 2362 lb/d Jan
001Nitrogen, ammonia total [as N]30DA AVG <= 1530 lb/d Mar
001Nitrogen, ammonia total [as N]30DA AVG <= 687 lb/d Jun
001Nitrogen, ammonia total [as N]30DA AVG <= 879 lb/d May
001Nitrogen, ammonia total [as N]30DA AVG <= 1476 lb/d Nov
001Nitrogen, ammonia total [as N]30DA AVG <= 757 lb/d Jul
001Nitrogen, ammonia total [as N]DAILY MX <= 2341 lb/d Aug
001Nitrogen, ammonia total [as N]DAILY MX <= 8634.6 lb/d Feb
001Nitrogen, ammonia total [as N]DAILY MX <= 8947 lb/d Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 5470 lb/d Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 7669 lb/d Apr
001Nitrogen, ammonia total [as N]DAILY MX <= 2906 lb/d Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 8271.6 lb/d Jan
001Nitrogen, ammonia total [as N]DAILY MX <= 8277 lb/d Mar
001Nitrogen, ammonia total [as N]DAILY MX <= 3007 lb/d Jun
001Nitrogen, ammonia total [as N]DAILY MX <= 4864 lb/d May
001Nitrogen, ammonia total [as N]DAILY MX <= 8605 lb/d Nov
001Nitrogen, ammonia total [as N]DAILY MX <= 2321 lb/d Jul
001Nitrogen, Kjeldahl, total [as N]30DA AVG report only all year
001Nitrogen, Kjeldahl, total [as N]DAILY MX report only all year
001Nitrogen, Kjeldahl, total [as N]30DA AVG report only all year
001Nitrogen, Kjeldahl, total [as N]DAILY MX report only all year
001Phosphorus, total [as P]30DA AVG report only all year
001Phosphorus, total [as P]DAILY MX report only all year
001Phosphorus, total [as P]30DA AVG report only all year
001Phosphorus, total [as P]DAILY MX report only all year
001E. coliGEO MEAN <= 126 #/100mL Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov
001Toxicity [acute], Ceriodaphnia dubiaDAILY MX <= 1 N=0;Y=1 all year
001Toxicity [acute], Pimephales promelas [Fathead Minnow]DAILY MX <= 1 N=0;Y=1 all year
001BOD, carbonaceous [5 day, 20 C]30DA AVG <= 25 mg/L all year
001BOD, carbonaceous [5 day, 20 C]7 DA AVG <= 40 mg/L all year
001BOD, carbonaceous [5 day, 20 C]30DA AVG <= 5046 lb/d all year
001BOD, carbonaceous [5 day, 20 C]7 DA AVG <= 8073 lb/d all year
003Nitrogen, total [as N]30DA AVG report only all year
003Nitrogen, total [as N]DAILY MX report only all year
003Nitrogen, total [as N]30DA AVG report only all year
003Nitrogen, total [as N]DAILY MX report only all year
003Phosphorus, total [as P]30DA AVG report only all year
003Phosphorus, total [as P]DAILY MX report only all year
003Phosphorus, total [as P]30DA AVG report only all year
003Phosphorus, total [as P]DAILY MX report only all year

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states