MIDAMERICAN ENERGY COMPANY

NPDES permit IA0077941 · Major NON-POTW · effective, expires 2028-06-30 · 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

1values over a limit
0required values missing, on 0 form(s)
1of 11 forms filed late

Last period with anything received: 2026-07-31. Most often over: Chromium, total [as Cr] (1).

Reporting

Reports are due about 15 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (15)

OutfallParameterStatisticLimitMonths
101pHDAILY MN >= 6 SU all year
101pHDAILY MX <= 9 SU all year
101Chromium, total [as Cr]30DA AVG <= .2 mg/L all year
101Chromium, total [as Cr]DAILY MX <= .2 mg/L all year
101Zinc, total [as Zn]30DA AVG <= 1 mg/L all year
101Zinc, total [as Zn]DAILY MX <= 1 mg/L all year
101Chlorine, total residual30DA AVG <= .13 mg/L all year
101Chlorine, total residualDAILY MX <= .13 mg/L all year
101Chlorine, total residual30DA AVG <= .054 lb/d all year
101Chlorine, total residualDAILY MX <= .054 lb/d all year
101Chlorine, free available30DA AVG <= .2 mg/L all year
101Chlorine, free availableDAILY MX <= .5 mg/L all year
101Toxicity [acute], Ceriodaphnia dubiaDAILY MX <= 1 N=0;Y=1 all year
101Toxicity [acute], Pimephales promelas [Fathead Minnow]DAILY MX <= 1 N=0;Y=1 all year
101Chlorination durationDAILY MX <= 2 hr/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