CITY OF COLFAX

NPDES permit IA0041980 · Minor POTW · effective, expires 2030-08-31 · 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

8values over a limit
0required values missing, on 0 form(s)
0of 12 forms filed late

Last period with anything received: 2026-08-31. Most often over: Solids, total suspended (3), Chlorine, total residual (2), 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 (73)

OutfallParameterStatisticLimitMonths
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 >= 6.5 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 <= 171 lb/d all year
001Solids, total suspended7 DA AVG <= 257 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, ammonia total [as N]30DA AVG <= 19.6 mg/L May
001Nitrogen, ammonia total [as N]30DA AVG <= 20.7 mg/L Mar
001Nitrogen, ammonia total [as N]30DA AVG <= 19.1 mg/L Nov
001Nitrogen, ammonia total [as N]30DA AVG <= 22.3 mg/L Jan
001Nitrogen, ammonia total [as N]30DA AVG <= 20.2 mg/L Apr
001Nitrogen, ammonia total [as N]30DA AVG <= 21.2 mg/L Dec
001Nitrogen, ammonia total [as N]30DA AVG <= 20.9 mg/L Oct
001Nitrogen, ammonia total [as N]30DA AVG <= 22.7 mg/L Feb
001Nitrogen, ammonia total [as N]30DA AVG <= 21.8 mg/L Sep
001Nitrogen, ammonia total [as N]30DA AVG <= 18.8 mg/L Jun
001Nitrogen, ammonia total [as N]30DA AVG <= 22.7 mg/L Jul
001Nitrogen, ammonia total [as N]30DA AVG <= 20.6 mg/L Aug
001Nitrogen, ammonia total [as N]DAILY MX <= 19.6 mg/L May
001Nitrogen, ammonia total [as N]DAILY MX <= 20.7 mg/L Mar
001Nitrogen, ammonia total [as N]DAILY MX <= 19.1 mg/L Nov
001Nitrogen, ammonia total [as N]DAILY MX <= 22.3 mg/L Jan
001Nitrogen, ammonia total [as N]DAILY MX <= 20.2 mg/L Apr
001Nitrogen, ammonia total [as N]DAILY MX <= 21.2 mg/L Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 20.9 mg/L Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 22.7 mg/L Feb
001Nitrogen, ammonia total [as N]DAILY MX <= 21.8 mg/L Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 18.8 mg/L Jun
001Nitrogen, ammonia total [as N]DAILY MX <= 22.7 mg/L Jul
001Nitrogen, ammonia total [as N]DAILY MX <= 20.6 mg/L Aug
001Nitrogen, ammonia total [as N]30DA AVG <= 99.1 lb/d May
001Nitrogen, ammonia total [as N]30DA AVG <= 100.3 lb/d Mar
001Nitrogen, ammonia total [as N]30DA AVG <= 96 lb/d Nov
001Nitrogen, ammonia total [as N]30DA AVG <= 106.2 lb/d Jan
001Nitrogen, ammonia total [as N]30DA AVG <= 102.3 lb/d Apr
001Nitrogen, ammonia total [as N]30DA AVG <= 105.7 lb/d Dec
001Nitrogen, ammonia total [as N]30DA AVG <= 104.1 lb/d Oct
001Nitrogen, ammonia total [as N]30DA AVG <= 104 lb/d Feb
001Nitrogen, ammonia total [as N]30DA AVG <= 76.6 lb/d Sep
001Nitrogen, ammonia total [as N]30DA AVG <= 71.5 lb/d Jun
001Nitrogen, ammonia total [as N]30DA AVG <= 74.8 lb/d Jul
001Nitrogen, ammonia total [as N]30DA AVG <= 80 lb/d Aug
001Nitrogen, ammonia total [as N]DAILY MX <= 99.1 lb/d May
001Nitrogen, ammonia total [as N]DAILY MX <= 100.3 lb/d Mar
001Nitrogen, ammonia total [as N]DAILY MX <= 96 lb/d Nov
001Nitrogen, ammonia total [as N]DAILY MX <= 106.2 lb/d Jan
001Nitrogen, ammonia total [as N]DAILY MX <= 102.3 lb/d Apr
001Nitrogen, ammonia total [as N]DAILY MX <= 105.7 lb/d Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 104.1 lb/d Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 104 lb/d Feb
001Nitrogen, ammonia total [as N]DAILY MX <= 76.6 lb/d Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 88 lb/d Jun
001Nitrogen, ammonia total [as N]DAILY MX <= 74.8 lb/d Jul
001Nitrogen, ammonia total [as N]DAILY MX <= 84.6 lb/d Aug
001Chlorine, total residual30DA AVG <= .028 mg/L all year
001Chlorine, total residualDAILY MX <= .028 mg/L all year
001Chlorine, total residual30DA AVG <= .13 lb/d all year
001Chlorine, total residualDAILY MX <= .13 lb/d all year
001E. coliGEO MEAN <= 126 #/100mL Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov
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 <= 143 lb/d all year
001BOD, carbonaceous [5 day, 20 C]7 DA AVG <= 229 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