CITY OF IOWA FALLS

NPDES permit IA0023442 · Major POTW · effective, expires 2031-08-31 · 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

0values over a limit
0required values missing, on 0 form(s)
0of 24 forms filed late

Last period with anything received: 2026-08-31.

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 (130)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]DAILY MN >= .7 mg/L all year
001pHDAILY MN >= 6 SU all year
001pHDAILY MX <= 9 SU 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 <= 657 lb/d all year
001Solids, total suspended7 DA AVG <= 985 lb/d all year
001Nitrogen, ammonia total [as N]30DA AVG <= 10.6 mg/L Jul
001Nitrogen, ammonia total [as N]30DA AVG <= 21.3 mg/L Mar
001Nitrogen, ammonia total [as N]30DA AVG <= 16 mg/L Apr
001Nitrogen, ammonia total [as N]30DA AVG <= 10 mg/L Aug
001Nitrogen, ammonia total [as N]30DA AVG <= 41.5 mg/L Feb
001Nitrogen, ammonia total [as N]30DA AVG <= 16.5 mg/L Oct
001Nitrogen, ammonia total [as N]30DA AVG <= 26.2 mg/L Dec
001Nitrogen, ammonia total [as N]30DA AVG <= 18.3 mg/L May
001Nitrogen, ammonia total [as N]30DA AVG <= 36.3 mg/L Jan
001Nitrogen, ammonia total [as N]30DA AVG <= 11.1 mg/L Sep
001Nitrogen, ammonia total [as N]30DA AVG <= 13.8 mg/L Jun
001Nitrogen, ammonia total [as N]30DA AVG <= 24.6 mg/L Nov
001Nitrogen, ammonia total [as N]DAILY MX <= 61.7 mg/L Jul
001Nitrogen, ammonia total [as N]DAILY MX <= 65.1 mg/L Mar
001Nitrogen, ammonia total [as N]DAILY MX <= 51.9 mg/L Apr
001Nitrogen, ammonia total [as N]DAILY MX <= 59.6 mg/L Aug
001Nitrogen, ammonia total [as N]DAILY MX <= 74.9 mg/L Feb
001Nitrogen, ammonia total [as N]DAILY MX <= 52 mg/L Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 52.3 mg/L Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 58.1 mg/L May
001Nitrogen, ammonia total [as N]DAILY MX <= 66.5 mg/L Jan
001Nitrogen, ammonia total [as N]DAILY MX <= 53.2 mg/L Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 57.1 mg/L Jun
001Nitrogen, ammonia total [as N]DAILY MX <= 50.5 mg/L Nov
001Nitrogen, ammonia total [as N]30DA AVG <= 112.9 lb/d Jul
001Nitrogen, ammonia total [as N]30DA AVG <= 228.4 lb/d Mar
001Nitrogen, ammonia total [as N]30DA AVG <= 171.2 lb/d Apr
001Nitrogen, ammonia total [as N]30DA AVG <= 107.1 lb/d Aug
001Nitrogen, ammonia total [as N]30DA AVG <= 443.8 lb/d Feb
001Nitrogen, ammonia total [as N]30DA AVG <= 175.8 lb/d Oct
001Nitrogen, ammonia total [as N]30DA AVG <= 279.8 lb/d Dec
001Nitrogen, ammonia total [as N]30DA AVG <= 195.7 lb/d May
001Nitrogen, ammonia total [as N]30DA AVG <= 387 lb/d Jan
001Nitrogen, ammonia total [as N]30DA AVG <= 118.8 lb/d Sep
001Nitrogen, ammonia total [as N]30DA AVG <= 147.6 lb/d Jun
001Nitrogen, ammonia total [as N]30DA AVG <= 263.1 lb/d Nov
001Nitrogen, ammonia total [as N]DAILY MX <= 829.7 lb/d Jul
001Nitrogen, ammonia total [as N]DAILY MX <= 811.6 lb/d Mar
001Nitrogen, ammonia total [as N]DAILY MX <= 709.2 lb/d Apr
001Nitrogen, ammonia total [as N]DAILY MX <= 787.5 lb/d Aug
001Nitrogen, ammonia total [as N]DAILY MX <= 894.1 lb/d Feb
001Nitrogen, ammonia total [as N]DAILY MX <= 709.8 lb/d Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 717.2 lb/d Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 755.8 lb/d May
001Nitrogen, ammonia total [as N]DAILY MX <= 832.5 lb/d Jan
001Nitrogen, ammonia total [as N]DAILY MX <= 734.4 lb/d Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 734.9 lb/d Jun
001Nitrogen, ammonia total [as N]DAILY MX <= 679.3 lb/d Nov
001Chlorine, total residual30DA AVG <= .094 mg/L all year
001Chlorine, total residualDAILY MX <= .18 mg/L all year
001Chlorine, total residual30DA AVG <= 1 lb/d all year
001Chlorine, total residualDAILY MX <= 2 lb/d 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 <= 547 lb/d all year
001BOD, carbonaceous [5 day, 20 C]7 DA AVG <= 876 lb/d all year
019Oxygen, dissolved [DO]DAILY MN >= .7 mg/L all year
019pHDAILY MN >= 6.2 SU all year
019pHDAILY MX <= 9 SU all year
019Solids, total suspended30DA AVG <= 30 mg/L all year
019Solids, total suspended7 DA AVG <= 45 mg/L all year
019Solids, total suspended30DA AVG <= 657 lb/d all year
019Solids, total suspended7 DA AVG <= 985 lb/d all year
019Nitrogen, ammonia total [as N]30DA AVG <= 15.7 mg/L Feb
019Nitrogen, ammonia total [as N]30DA AVG <= 8.1 mg/L Mar
019Nitrogen, ammonia total [as N]30DA AVG <= 4 mg/L Jul
019Nitrogen, ammonia total [as N]30DA AVG <= 4.2 mg/L Sep
019Nitrogen, ammonia total [as N]30DA AVG <= 3.8 mg/L Aug
019Nitrogen, ammonia total [as N]30DA AVG <= 9.9 mg/L Dec
019Nitrogen, ammonia total [as N]30DA AVG <= 9.3 mg/L Nov
019Nitrogen, ammonia total [as N]30DA AVG <= 5.2 mg/L Jun
019Nitrogen, ammonia total [as N]30DA AVG <= 6.1 mg/L Apr
019Nitrogen, ammonia total [as N]30DA AVG <= 6.2 mg/L Oct
019Nitrogen, ammonia total [as N]30DA AVG <= 6.9 mg/L May
019Nitrogen, ammonia total [as N]30DA AVG <= 13.7 mg/L Jan
019Nitrogen, ammonia total [as N]DAILY MX <= 16.2 mg/L Feb
019Nitrogen, ammonia total [as N]DAILY MX <= 16.4 mg/L Mar
019Nitrogen, ammonia total [as N]DAILY MX <= 19.4 mg/L Jul
019Nitrogen, ammonia total [as N]DAILY MX <= 18 mg/L Sep
019Nitrogen, ammonia total [as N]DAILY MX <= 17.9 mg/L Aug
019Nitrogen, ammonia total [as N]DAILY MX <= 17.5 mg/L Dec
019Nitrogen, ammonia total [as N]DAILY MX <= 16.1 mg/L Nov
019Nitrogen, ammonia total [as N]DAILY MX <= 16 mg/L Jun
019Nitrogen, ammonia total [as N]DAILY MX <= 17.2 mg/L Apr
019Nitrogen, ammonia total [as N]DAILY MX <= 17.2 mg/L Oct
019Nitrogen, ammonia total [as N]DAILY MX <= 16.8 mg/L May
019Nitrogen, ammonia total [as N]DAILY MX <= 17 mg/L Jan
019Nitrogen, ammonia total [as N]30DA AVG <= 309.8 lb/d Feb
019Nitrogen, ammonia total [as N]30DA AVG <= 160 lb/d Mar
019Nitrogen, ammonia total [as N]30DA AVG <= 78.8 lb/d Jul
019Nitrogen, ammonia total [as N]30DA AVG <= 82.9 lb/d Sep
019Nitrogen, ammonia total [as N]30DA AVG <= 74.8 lb/d Aug
019Nitrogen, ammonia total [as N]30DA AVG <= 195.2 lb/d Dec
019Nitrogen, ammonia total [as N]30DA AVG <= 183.5 lb/d Nov
019Nitrogen, ammonia total [as N]30DA AVG <= 103 lb/d Jun
019Nitrogen, ammonia total [as N]30DA AVG <= 119.5 lb/d Apr
019Nitrogen, ammonia total [as N]30DA AVG <= 122.6 lb/d Oct
019Nitrogen, ammonia total [as N]30DA AVG <= 136.6 lb/d May
019Nitrogen, ammonia total [as N]30DA AVG <= 269.8 lb/d Jan
019Nitrogen, ammonia total [as N]DAILY MX <= 349 lb/d Feb
019Nitrogen, ammonia total [as N]DAILY MX <= 355.1 lb/d Mar
019Nitrogen, ammonia total [as N]DAILY MX <= 419.3 lb/d Jul
019Nitrogen, ammonia total [as N]DAILY MX <= 390.8 lb/d Sep
019Nitrogen, ammonia total [as N]DAILY MX <= 387.4 lb/d Aug
019Nitrogen, ammonia total [as N]DAILY MX <= 378.3 lb/d Dec
019Nitrogen, ammonia total [as N]DAILY MX <= 348.5 lb/d Nov
019Nitrogen, ammonia total [as N]DAILY MX <= 345.9 lb/d Jun
019Nitrogen, ammonia total [as N]DAILY MX <= 372.2 lb/d Apr
019Nitrogen, ammonia total [as N]DAILY MX <= 372.2 lb/d Oct
019Nitrogen, ammonia total [as N]DAILY MX <= 363.2 lb/d May
019Nitrogen, ammonia total [as N]DAILY MX <= 367.1 lb/d Jan
019Chlorine, total residual30DA AVG <= .023 mg/L all year
019Chlorine, total residualDAILY MX <= .023 mg/L all year
019Chlorine, total residual30DA AVG <= .389 lb/d all year
019Chlorine, total residualDAILY MX <= .457 lb/d all year
019E. coliGEO MEAN <= 126 #/100mL Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov
019BOD, carbonaceous [5 day, 20 C]30DA AVG <= 25 mg/L all year
019BOD, carbonaceous [5 day, 20 C]7 DA AVG <= 40 mg/L all year
019BOD, carbonaceous [5 day, 20 C]30DA AVG <= 547 lb/d all year
019BOD, carbonaceous [5 day, 20 C]7 DA AVG <= 876 lb/d 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