CITY OF FORT BENTON

NPDES permit MT0021601 · 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)
12of 40 forms filed late

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

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 (54)

OutfallParameterStatisticLimitMonths
001Flow rateMO AVG report only all year
001BOD, 5-day, 20 deg. CMO AVG <= 30 mg/L all year
001BOD, 5-day, 20 deg. CDAILY MX <= 45 mg/L all year
001BOD, 5-day, 20 deg. CMO AVG <= 64 lb/d all year
001BOD, 5-day, 20 deg. CMX WK AV <= 96 lb/d all year
001BOD, 5-day, 20 deg. CMO AVG report only all year
001pHDAILY MN >= 6 SU all year
001pHMO AVG report only all year
001pHDAILY MX <= 9 SU all year
001Solids, total suspendedMO AVG <= 45 mg/L all year
001Solids, total suspendedMX WK AV <= 65 mg/L all year
001Solids, total suspendedMO AVG <= 96 lb/d all year
001Solids, total suspendedMX WK AV <= 138 lb/d all year
001Solids, total suspendedMO AVG report only all year
001Oil and grease, hexane extr methodMO AVG report only all year
001Oil and grease, hexane extr methodDAILY MX <= 10 mg/L all year
001Nitrogen, total [as N]MO AVG report only all year
001Nitrogen, ammonia total [as N]MO AVG report only all year
001Nitrogen, Kjeldahl, total [as N]MO AVG report only all year
001Nitrite + Nitrate total [as N]MO AVG report only all year
001Phosphorus, total [as P]MO AVG report only all year
001Arsenic, total recoverableMO AVG report only all year
001E. coli, MTEC-MFMOAV GEO <= 126 CFU/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
001E. coli, MTEC-MFMOAV GEO <= 630 CFU/100mL Jan, Feb, Mar, Nov, Dec
001E. coli, MTEC-MFDAILY MX <= 252 CFU/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
001E. coli, MTEC-MFDAILY MX <= 1260 CFU/100mL Jan, Feb, Mar, Nov, Dec
001BOD, 5-day, percent removalMO AV MN >= 85 % all year
001Solids, suspended percent removalMO AV MN >= 65 % all year
002Flow rateMO AVG report only all year
002BOD, 5-day, 20 deg. CMO AVG <= 30 mg/L all year
002BOD, 5-day, 20 deg. CDAILY MX <= 45 mg/L all year
002BOD, 5-day, 20 deg. CMOAV GEO <= 64 lb/d all year
002BOD, 5-day, 20 deg. CMX WK AV <= 96 lb/d all year
002pHDAILY MN >= 6 SU all year
002pHMO AVG report only all year
002pHDAILY MX <= 9 SU all year
002Solids, total suspendedMO AVG <= 45 mg/L all year
002Solids, total suspendedMX WK AV <= 65 mg/L all year
002Solids, total suspendedMO AVG <= 96 lb/d all year
002Solids, total suspendedMX WK AV <= 138 lb/d all year
002Oil and grease, hexane extr methodMO AVG report only all year
002Oil and grease, hexane extr methodDAILY MX <= 10 mg/L all year
002Nitrogen, total [as N]MO AVG report only all year
002Nitrogen, ammonia total [as N]MO AVG report only all year
002Nitrogen, Kjeldahl, total [as N]MO AVG report only all year
002Nitrite + Nitrate total [as N]MO AVG report only all year
002Phosphorus, total [as P]MO AVG report only all year
002Arsenic, total recoverableMO AVG report only all year
002E. coli, MTEC-MFMOAV GEO <= 630 CFU/100mL Jan, Feb, Mar, Nov, Dec
002E. coli, MTEC-MFMOAV GEO <= 126 CFU/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
002E. coli, MTEC-MFDAILY MX <= 1260 CFU/100mL Jan, Feb, Mar, Nov, Dec
002E. coli, MTEC-MFDAILY MX <= 252 CFU/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
002BOD, 5-day, percent removalMO AV MN >= 85 % all year
002Solids, suspended percent removalMO AV MN >= 65 % 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