CITY OF BIG TIMBER

NPDES permit MT0020753 · Minor POTW · administratively continued, expires 2017-04-30 · 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.

This permit expired on 2017-04-30 and is administratively continued: its last limits keep applying until a new permit is issued, and EPA still expects the reports.

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

13values over a limit
0required values missing, on 0 form(s)
2of 14 forms filed late

Last period with anything received: 2026-08-31. Most often over: Solids, total suspended (10), Solids, suspended percent removal (3).

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 (68)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. fahrenheitMO AVG report only all year
001Temperature, water deg. fahrenheitDAILY 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. CMO AVG <= 42 mg/L all year
001BOD, 5-day, 20 deg. CMX WK AV <= 45 mg/L all year
001BOD, 5-day, 20 deg. CMX WK AV <= 63 mg/L all year
001BOD, 5-day, 20 deg. CMO AVG <= 68 lb/d all year
001BOD, 5-day, 20 deg. CMO AVG <= 95.2 lb/d all year
001BOD, 5-day, 20 deg. CMX 7D AV <= 102 lb/d all year
001BOD, 5-day, 20 deg. CMX 7D AV <= 143 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
001pHINST MIN >= 6 SU all year
001pHINST MIN >= 5.5 SU all year
001pHINST MAX <= 9 SU all year
001pHINST MAX <= 9.5 SU all year
001Solids, total suspendedMO AVG <= 30 mg/L all year
001Solids, total suspendedMO AVG <= 42 mg/L all year
001Solids, total suspendedMX WK AV <= 45 mg/L all year
001Solids, total suspendedMX WK AV <= 63 mg/L all year
001Solids, total suspendedMO AVG <= 77 lb/d all year
001Solids, total suspendedMO AVG <= 108 lb/d all year
001Solids, total suspendedMX WK AV <= 116 lb/d all year
001Solids, total suspendedMX WK AV <= 162.4 lb/d all year
001Solids, total suspendedMO AVG report only all year
001Solids, total suspendedMX WK AV report only all year
001Oil and grease, hexane extr methodVALUE report only all year
001Nitrogen, total [as N]MO AVG report only all year
001Nitrogen, total [as N]MX WK AV report only all year
001Nitrogen, total [as N]MO AVG report only all year
001Nitrogen, total [as N]MX WK AV report only all year
001Nitrogen, ammonia total [as N]MO AVG report only all year
001Nitrogen, ammonia total [as N]MX WK AV report only all year
001Nitrogen, Kjeldahl, total [as N]MO AVG report only all year
001Nitrogen, Kjeldahl, total [as N]MX WK AV report only all year
001Nitrite + Nitrate total [as N]MO AVG report only all year
001Nitrite + Nitrate total [as N]MX WK AV report only all year
001Phosphorus, total [as P]MO AVG report only all year
001Phosphorus, total [as P]MX WK AV report only all year
001Phosphorus, total [as P]MO AVG report only all year
001Phosphorus, total [as P]MX WK AV report only all year
001Iron, total recoverableMO AVG report only all year
001Iron, total recoverableDAILY MX report only all year
001Iron, total recoverableMO AVG report only all year
001Iron, total recoverableDAILY MX report only all year
001Lead, total recoverableMO AVG report only all year
001Lead, total recoverableDAILY MX report only all year
001Lead, total recoverableMO AVG report only all year
001Lead, total recoverableDAILY MX report only all year
001Copper, total recoverableMO AVG report only all year
001Copper, total recoverableDAILY MX report only all year
001Copper, total recoverableMO AVG report only all year
001Copper, total recoverableDAILY MX report only all year
001E. coli, MTEC-MFMO AVG report only Apr, May, Jun, Jul, Aug, Sep, Oct
001E. coli, MTEC-MFMO AVG report only Jan, Feb, Mar, Nov, Dec
001E. coli, MTEC-MFMX WK AV report only Apr, May, Jun, Jul, Aug, Sep, Oct
001E. coli, MTEC-MFMX WK AV report only Jan, Feb, Mar, Nov, Dec
001Chlorine, total residualMO AVG <= .1 mg/L all year
001Chlorine, total residualDAILY MX <= .1 mg/L all year
001Coliform, fecal generalMO AVG <= 480 CFU/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
001Coliform, fecal generalMO AVG <= 2400 CFU/100mL Jan, Feb, Mar, Nov, Dec
001Coliform, fecal generalMX WK AV <= 240 CFU/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
001Coliform, fecal generalMX WK AV <= 1200 CFU/100mL Jan, Feb, Mar, Nov, Dec
001BOD, 5-day, percent removalMO AV MN >= 85 % all year
001BOD, 5-day, percent removalMO AV MN >= 65 % all year
001Solids, suspended percent removalMO AV MN >= 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