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NPDES permit MT0030350 · Minor NON-POTW · administratively continued, expires 2026-07-31 · 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 2026-07-31 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

2values over a limit
0required values missing, on 0 form(s)
0of 59 forms filed late

Last period with anything received: 2026-07-31. Most often over: Aluminum, dissolved [as Al] (1), Nitrogen, total [as N] (1).

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 (77)

OutfallParameterStatisticLimitMonths
001Flow rateMO AVG report only all year
001Flow rateDAILY MX report only all year
001Oxygen, dissolved [DO]DAILY MN >= 4 mg/L all year
001Oxygen, dissolved [DO]MO AV MN >= 6.5 mg/L all year
001pHINST MIN >= 6 SU all year
001pHINST MAX <= 9 SU all year
001Oil & GreaseMAXIMUM <= 10 mg/L all year
001Nitrogen, total [as N]MO AVG report only Jun, Jul, Aug, Sep
001Nitrogen, total [as N]MO AVG <= 2.15 lb/d Jun, Jul, Aug, Sep
001Nitrogen, Kjeldahl, total [as N]MO AVG report only Jun, Jul, Aug, Sep
001Nitrite + Nitrate total [as N]MO AVG report only Jun, Jul, Aug, Sep
001Phosphorus, total [as P]MO AVG report only Jun, Jul, Aug, Sep
001Phosphorus, total [as P]MO AVG <= .243 lb/d Jun, Jul, Aug, Sep
001Arsenic, total recoverableMO AVG <= 10 ug/L all year
001Arsenic, total recoverableDAILY MX <= 10 ug/L all year
001Nickel, total recoverableMO AVG <= 100 ug/L all year
001Nickel, total recoverableDAILY MX <= 100 ug/L all year
001Zinc, total recoverableMO AVG <= 102 ug/L all year
001Zinc, total recoverableDAILY MX <= 180 ug/L all year
001Aluminum, dissolved [as Al]MO AVG <= 68 ug/L all year
001Aluminum, dissolved [as Al]DAILY MX <= 153 ug/L all year
001Copper, total recoverableMO AVG <= 9.8 ug/L all year
001Copper, total recoverableDAILY MX <= 22.5 ug/L all year
001Chlorine, total residualMO AVG <= .0999 mg/L all year
001Chlorine, total residualDAILY MX <= .0999 mg/L all year
001Solids, total dissolved [TDS]MO AVG <= 1000 mg/L all year
001Mercury, total recoverableMO AVG <= .05 ug/L all year
001Mercury, total recoverableDAILY MX <= .05 ug/L all year
001Oil and grease visualVALUE report only all year
001Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubiaVALUE <= 0 pass=0;fail=1 all year
001Pass/Fail Static Renewal 7Day Chronic Pimephales promelasVALUE <= 0 pass=0;fail=1 all year
001BFlow rateMO AVG report only all year
001BFlow rateDAILY MX report only all year
001BBOD, 5-day, 20 deg. CMO AVG <= 30 mg/L all year
001BBOD, 5-day, 20 deg. CDAILY MX <= 45 mg/L all year
001BSolids, total suspendedMO AVG <= 30 mg/L all year
001BSolids, total suspendedDAILY MX <= 100 mg/L all year
001BChemical Oxygen Demand [COD]MO AVG <= 120 mg/L all year
001BChemical Oxygen Demand [COD]DAILY MX <= 180 mg/L all year
002Flow rateDAILY MX report only all year
002Solids, total suspendedDAILY MX report only all year
002Arsenic, total recoverableDAILY MX report only all year
002Zinc, total recoverableDAILY MX report only all year
002Lead, total recoverableDAILY MX report only all year
002Copper, total recoverableDAILY MX report only all year
002Chemical Oxygen Demand [COD]DAILY MX report only all year
002Oil and grease visualVALUE report only all year
003Flow rateMO AVG report only all year
003Flow rateDAILY MX report only all year
003Oxygen, dissolved [DO]DAILY MN >= 6 mg/L all year
003Oxygen, dissolved [DO]WE <= 5 mg/L all year
003pHINST MIN >= 6 SU all year
003pHINST MAX <= 9 SU all year
003Oil & GreaseMAXIMUM <= 10 mg/L all year
003Nitrogen, total [as N]MO AVG report only Jun, Jul, Aug, Sep
003Nitrogen, total [as N]MO AVG <= 2.15 lb/d Jun, Jul, Aug, Sep
003Nitrogen, Kjeldahl, total [as N]MO AVG report only Jun, Jul, Aug, Sep
003Nitrite + Nitrate total [as N]MO AVG report only Jun, Jul, Aug, Sep
003Phosphorus, total [as P]MO AVG report only Jun, Jul, Aug, Sep
003Phosphorus, total [as P]MO AVG <= .243 lb/d Jun, Jul, Aug, Sep
003Arsenic, total recoverableMO AVG <= 10 ug/L all year
003Arsenic, total recoverableDAILY MX <= 10 ug/L all year
003Nickel, total recoverableMO AVG <= 75 ug/L all year
003Nickel, total recoverableDAILY MX <= 93 ug/L all year
003Zinc, total recoverableMO AVG <= 102 ug/L all year
003Zinc, total recoverableDAILY MX <= 180 ug/L all year
003Aluminum, dissolved [as Al]MO AVG <= 68 ug/L all year
003Aluminum, dissolved [as Al]DAILY MX <= 153 ug/L all year
003Copper, total recoverableMO AVG <= 9.8 ug/L all year
003Copper, total recoverableDAILY MX <= 22.5 ug/L all year
003Chlorine, total residualMO AVG <= .0999 mg/L all year
003Chlorine, total residualDAILY MX <= .0999 mg/L all year
003Solids, total dissolved [TDS]MO AVG <= 1000 mg/L all year
003Mercury, total recoverableMO AVG <= .05 ug/L all year
003Mercury, total recoverableDAILY MX <= .05 ug/L all year
003Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubiaVALUE <= 0 pass=0;fail=1 all year
003Pass/Fail Static Renewal 7Day Chronic Pimephales promelasVALUE <= 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