BUTTE SILVER BOW CITY AND COUNTY

NPDES permit MT0022012 · Major POTW · administratively continued, expires 2017-03-31 · 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.

This permit expired on 2017-03-31 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

0values over a limit
0required values missing, on 0 form(s)
0of 21 forms filed late

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

Reporting

Reports are due about 28 days after each monitoring period ends (the most common figure among MT permits in EPA's filings — check your permit).

Limits in force (59)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. centigradeMO AVG report only all year
001Temperature, water deg. centigradeDAILY MX report only all year
001Flow rateDAILY AV report only all year
001Flow rateDAILY MX report only all year
001Flow rateDAILY AV report only all year
001Flow rateDAILY MX report only all year
001Oxygen, dissolved [DO]MO AVG report only all year
001Oxygen, dissolved [DO]MX WK AV 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 <= 2127 lb/d all year
001BOD, 5-day, 20 deg. CMX WK AV <= 3190 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 >= 6.5 SU all year
001pHINST MAX <= 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 <= 2127 lb/d all year
001Solids, total suspendedMX WK AV <= 3190 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 <= 97 lb/d Jun, Jul, Aug, Sep
001Nitrogen, total [as N]MO AVG <= 136 lb/d Jun, Jul, Aug, Sep
001Nitrogen, ammonia total [as N]MO AVG <= 3.7 mg/L all year
001Nitrogen, ammonia total [as N]DAILY MX <= 7.5 mg/L all year
001Nitrogen, Kjeldahl, total [as N]MO AVG report only Jun, Jul, Aug, Sep
001Nitrogen, Kjeldahl, total [as N]WKLY MAX report only Jun, Jul, Aug, Sep
001Nitrite + Nitrate total [as N]MO AVG report only Jun, Jul, Aug, Sep
001Nitrite + Nitrate total [as N]WKLY MAX report only Jun, Jul, Aug, Sep
001Phosphorus, total [as P]MO AVG report only Jun, Jul, Aug, Sep
001Phosphorus, total [as P]MO AVG <= 13.6 lb/d Jun, Jul, Aug, Sep
001Phosphorus, total [as P]MO AVG <= 9.7 lb/d Jun, Jul, Aug, Sep
001Zinc, total recoverableMO AVG <= 170 ug/L all year
001Zinc, total recoverableMO AVG <= 122 ug/L all year
001Zinc, total recoverableMAXIMUM <= 234 ug/L all year
001Zinc, total recoverableDAILY MX <= 151 ug/L all year
001Zinc, total recoverableSINGSAMP report only all year
001Cadmium, total recoverableMO AVG <= .46 ug/L all year
001Cadmium, total recoverableDAILY MX <= .67 ug/L all year
001Cadmium, total recoverableSINGSAMP report only all year
001Copper, total recoverableMO AVG <= 12.8 ug/L all year
001Copper, total recoverableMO AVG <= 14.4 ug/L all year
001Copper, total recoverableDAILY MX <= 14 ug/L all year
001Copper, total recoverableMAXIMUM <= 28.9 ug/L all year
001Copper, total recoverableSINGSAMP report only all year
001E. coli, MTEC-MFMO AVG <= 630 CFU/100mL Jan, Feb, Mar, Nov, Dec
001E. coli, MTEC-MFMO AVG <= 126 CFU/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
001E. coli, MTEC-MFMX WK AV <= 1260 CFU/100mL Jan, Feb, Mar, Nov, Dec
001E. coli, MTEC-MFMX WK AV <= 252 CFU/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
001Solids, total dissolved [TDS]VALUE report only all year
001Mercury, total recoverableMO AVG <= .025 ug/L all year
001Mercury, total recoverableDAILY MX <= .05 ug/L all year
001Mercury, total recoverableSINGSAMP report only all year
001BOD, 5-day, percent removalMINIMUM >= 85 % all year
001Solids, suspended percent removalMINIMUM >= 85 % all year
001Pass/Fail Static 48Hr Acute Ceriodaphnia dubiaSINGSAMP <= 0 pass=0;fail=1 all year
001Pass/Fail Static Renewal 96Hr Acute Pimephales PromelasSINGSAMP <= 0 pass=0;fail=1 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