CITY OF COLSTRIP

NPDES permit MT0022373 · Minor POTW · effective, expires 2026-10-31 · 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

0values over a limit
0required values missing, on 0 form(s)
0of 15 forms filed late

Last period with anything received: 2026-07-31.

Reporting

Reports are due about 28 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (39)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. centigradeMO AVG report only all year
001Temperature, water deg. centigradeDAILY MX report only all year
001Flow rateMO AVG report only all year
001Flow rateDAILY MX report only all year
001BOD, 5-day, 20 deg. CMO AVG <= 30 mg/L all year
001BOD, 5-day, 20 deg. CMX WK AV <= 45 mg/L all year
001BOD, 5-day, 20 deg. CMO AVG <= 150 lb/d all year
001BOD, 5-day, 20 deg. CMX WK AV <= 225 lb/d all year
001BOD, 5-day, 20 deg. CMO AVG report only all year
001BOD, 5-day, 20 deg. CMX WK AV report only all year
001pHMINIMUM >= 6 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspendedMO AVG <= 30 mg/L all year
001Solids, total suspendedMX WK AV <= 45 mg/L all year
001Solids, total suspendedMO AVG <= 150 lb/d all year
001Solids, total suspendedMX WK AV <= 225 lb/d all year
001Solids, total suspendedMO AVG report only all year
001Solids, total suspendedMX WK AV report only all year
001Oil & GreaseDAILY MX <= 10 mg/L all year
001Nitrogen, total [as N]MO AVG report only Jul, Aug, Sep
001Nitrogen, total [as N]MO AVG report only Jul, Aug, Sep
001Nitrogen, ammonia total [as N]MO AVG report only all year
001Nitrogen, ammonia total [as N]DAILY MX report only all year
001Nitrogen, Kjeldahl, total [as N]MO AVG report only all year
001Nitrogen, Kjeldahl, total [as N]DAILY MX report only all year
001Nitrite + Nitrate total [as N]MO AVG report only Apr, May, Jun, Jul, Aug, Sep, Oct
001Nitrite + Nitrate total [as N]MO AVG report only Jan, Feb, Mar, Nov, Dec
001Nitrite + Nitrate total [as N]DAILY MX report only Apr, May, Jun, Jul, Aug, Sep, Oct
001Nitrite + Nitrate total [as N]DAILY MX <= 10 mg/L Jan, Feb, Mar, Nov, Dec
001Phosphorus, total [as P]MO AVG report only Jul, Aug, Sep
001Phosphorus, total [as P]MO AVG report only Jul, Aug, Sep
001E. coli, MTEC-MFMOAV GEO <= 630 #/100mL Jan, Feb, Mar, Nov, Dec
001E. coli, MTEC-MFMOAV GEO report only Apr, May, Jun, Jul, Aug, Sep, Oct
001E. coli, MTEC-MFMX WK AV <= 1260 #/100mL Jan, Feb, Mar, Nov, Dec
001E. coli, MTEC-MFMX WK AV report only Apr, May, Jun, Jul, Aug, Sep, Oct
001BOD, 5-day, percent removalMO AV MN >= 85 % all year
001BOD, 5-day, percent removalDAILY AV <= 85 % all year
001Solids, suspended percent removalMO AV MN >= 85 % all year
001Solids, suspended percent removalDAILY AV <= 85 % 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