IOWA STATE UNIVERSITY

NPDES permit IA0032697 · Minor NON-POTW · effective, expires 2029-10-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file
Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

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

5values over a limit
0required values missing, on 0 form(s)
0of 11 forms filed late

Last period with anything received: 2026-07-31. Most often over: Chloride [as Cl] (4), Sulfate, total [as SO4] (1).

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 (46)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. fahrenheit30DA AVG <= 89.6 deg F Feb
001Temperature, water deg. fahrenheit30DA AVG <= 89.6 deg F May
001Temperature, water deg. fahrenheit30DA AVG <= 89.6 deg F Aug
001Temperature, water deg. fahrenheit30DA AVG <= 89.6 deg F Jun
001Temperature, water deg. fahrenheit30DA AVG <= 89.6 deg F Nov
001Temperature, water deg. fahrenheit30DA AVG <= 89.6 deg F Oct
001Temperature, water deg. fahrenheit30DA AVG <= 89.6 deg F Apr
001Temperature, water deg. fahrenheit30DA AVG <= 83.9 deg F Jan
001Temperature, water deg. fahrenheit30DA AVG <= 89.6 deg F Jul
001Temperature, water deg. fahrenheit30DA AVG <= 89.6 deg F Sep
001Temperature, water deg. fahrenheit30DA AVG <= 83.9 deg F Dec
001Temperature, water deg. fahrenheit30DA AVG <= 89.6 deg F Mar
001Temperature, water deg. fahrenheitDAILY MX <= 89.6 deg F Feb
001Temperature, water deg. fahrenheitDAILY MX <= 89.6 deg F May
001Temperature, water deg. fahrenheitDAILY MX <= 89.6 deg F Aug
001Temperature, water deg. fahrenheitDAILY MX <= 89.6 deg F Jun
001Temperature, water deg. fahrenheitDAILY MX <= 89.6 deg F Nov
001Temperature, water deg. fahrenheitDAILY MX <= 89.6 deg F Oct
001Temperature, water deg. fahrenheitDAILY MX <= 89.6 deg F Apr
001Temperature, water deg. fahrenheitDAILY MX <= 89.6 deg F Jan
001Temperature, water deg. fahrenheitDAILY MX <= 89.6 deg F Jul
001Temperature, water deg. fahrenheitDAILY MX <= 89.6 deg F Sep
001Temperature, water deg. fahrenheitDAILY MX <= 89.6 deg F Dec
001Temperature, water deg. fahrenheitDAILY MX <= 89.6 deg F Mar
001pHDAILY MN >= 6.5 SU all year
001pHDAILY MX <= 9 SU all year
001Chloride [as Cl]30DA AVG <= 389 mg/L all year
001Chloride [as Cl]DAILY MX <= 760 mg/L all year
001Chloride [as Cl]30DA AVG <= 1306 lb/d all year
001Chloride [as Cl]DAILY MX <= 2553 lb/d all year
001Sulfate, total [as SO4]30DA AVG <= 1514 mg/L all year
001Sulfate, total [as SO4]DAILY MX <= 2000 mg/L all year
001Sulfate, total [as SO4]30DA AVG <= 5088 lb/d all year
001Sulfate, total [as SO4]DAILY MX <= 6722 lb/d all year
001Chromium, hexavalent [as Cr]30DA AVG <= .011 mg/L all year
001Chromium, hexavalent [as Cr]DAILY MX <= .016 mg/L all year
001Chromium, hexavalent [as Cr]30DA AVG <= .038 lb/d all year
001Chromium, hexavalent [as Cr]DAILY MX <= .055 lb/d all year
001Iron, total [as Fe]30DA AVG <= 1 mg/L all year
001Iron, total [as Fe]DAILY MX <= 1 mg/L all year
001Iron, total [as Fe]30DA AVG <= 3.05 lb/d all year
001Iron, total [as Fe]DAILY MX <= 3.05 lb/d all year
001Chlorine, total residual30DA AVG <= .017 mg/L all year
001Chlorine, total residualDAILY MX <= .03 mg/L all year
001Chlorine, total residual30DA AVG <= .055 lb/d all year
001Chlorine, total residualDAILY MX <= .094 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