CITY OF THREE FORKS

NPDES permit MT0020401 · Minor POTW · effective, expires 2027-04-30 · 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

1values over a limit
0required values missing, on 0 form(s)
1of 23 forms filed late

Last period with anything received: 2026-07-31. Most often over: Solids, suspended percent removal (1).

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 (37)

OutfallParameterStatisticLimitMonths
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. CWKLY MAX <= 45 mg/L all year
001BOD, 5-day, 20 deg. CMO AVG <= 113 lb/d all year
001BOD, 5-day, 20 deg. CWKLY MAX <= 170 lb/d all year
001BOD, 5-day, 20 deg. CMO AVG report only all year
001pHDAILY MN >= 6 SU all year
001pHDAILY MX <= 9 SU all year
001Solids, total suspendedMO AVG <= 30 mg/L all year
001Solids, total suspendedWKLY MAX <= 45 mg/L all year
001Solids, total suspendedMO AVG <= 113 lb/d all year
001Solids, total suspendedWKLY MAX <= 170 lb/d all year
001Solids, total suspendedMO AVG report only all year
001Oil & GreaseDAILY MX report only 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, Kjeldahl, total [as N]MO AVG report only Jul, Aug, Sep
001Nitrite + Nitrate total [as N]MO AVG report only all year
001Phosphorus, total [as P]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-MFMO GEO <= 630 #/100mL Jan, Feb, Mar, Nov, Dec
001E. coli, MTEC-MFMO GEO <= 126 #/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
001E. coli, MTEC-MFWE <= 1260 #/100mL Jan, Feb, Mar, Nov, Dec
001E. coli, MTEC-MFWE <= 252 #/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
001BOD, 5-day, percent removalMINIMUM >= 85 % all year
001Solids, suspended percent removalMINIMUM >= 85 % all year
001Oil and grease visualVALUE report only all year
001BTemperature, water deg. centigradeMO AVG report only all year
001BpHMO AVG report only all year
001BNitrogen, total [as N]MO AVG report only Jul, Aug, Sep
001BNitrogen, ammonia total [as N]MO AVG report only all year
001BPhosphorus, total [as P]MO AVG report only Jul, Aug, Sep
001BHardness, total [as CaCO3]MO AVG report only all year
001BArsenic, total recoverableMO AVG report only 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