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Clean Water Act discharge permit · NPDES MTX000222

BOULDER SCIENTIFIC MINING CO - DARBY MILL SITE, Darby, MT: NPDES MTX000222 discharge permit, effluent exceedances, inspections, penalties

BOULDER SCIENTIFIC MINING CO - DARBY MILL SITE, held by BOULDER SCIENTIFIC MINING COMPANY, holds NPDES permit MTX000222, which discharges to Bitterroot River. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.

What the register holds for BOULDER SCIENTIFIC MINING CO - DARBY MILL SITE: its NPDES ID, its permit type and status, its its address in Darby, Montana, its receiving water. EPA’s effluent violation file and its single-event violation file hold no violation for NPDES MTX000222.

Identity

Facility as filedBOULDER SCIENTIFIC MINING CO - DARBY MILL SITE
Permittee as filedBOULDER SCIENTIFIC MINING COMPANY
NPDES IDMTX000222
Permit statusNot needed
Permit typeState-issued individual permit
Discharger classMinor discharger
Facility typeNot a publicly owned treatment works
Issuing agencyMONTANA DEQ
AddressDarby, MT 59829
Receiving waterBITTERROOT RIVER
SubwatershedBitterroot River-Darby (HUC 170102050806)

Cited to the EPA ICIS-NPDES permit file (ECHO download).

Effluent limits and exceedances

EPA’s limits and effluent violation files hold no pollutant row for NPDES MTX000222.

Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.

Inspections, violations and enforcement

EPA’s single-event violation file, as loaded, holds no violation for NPDES MTX000222.

Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.

Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.

Watch this permit

One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, MTX000222.

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How we handle your data → Privacy

EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID MTX000222 there.

Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.

What this page shows

The BOULDER SCIENTIFIC MINING CO - DARBY MILL SITE permit is one of 15 state-issued individual permits in Ravalli County on EPA's NPDES register, and it is one of 6 NPDES permits in the Bitterroot River-Darby subwatershed. Among the 15 county peers, 33.3% have a violation on file, while this permit has no pollutants under a numeric limit and no pollutants with an effluent exceedance.