Clean Water Act discharge permit · NPDES MTR108595

MONTANA HISTORICAL SOCIETY & MUSEUM BUILDING, Helena, MT: NPDES MTR108595 discharge permit, effluent exceedances, inspections, penalties

EffectivePermit status
MinorDischarger class
0Pollutants under a numeric limit
0Pollutants with an effluent exceedance

MONTANA HISTORICAL SOCIETY & MUSEUM BUILDING, held by SLETTEN CONSTRUCTION COMPANY, holds NPDES permit MTR108595, which discharges to Dnrc Stormwater Pond. EPA’s file records it issued September 1, 2020 and expiring December 31, 2022. 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.

Identity

Facility as filed	MONTANA HISTORICAL SOCIETY & MUSEUM BUILDING
Permittee as filed	SLETTEN CONSTRUCTION COMPANY
NPDES ID	MTR108595
Permit status	Effective
Permit type	Coverage under a general permit
Discharger class	Minor discharger
Facility type	Not a publicly owned treatment works
Program	Construction stormwater
Issued	September 1, 2020
Expiration date	December 31, 2022
Address	Helena, MT 59601
Receiving water	DNRC Stormwater Pond
Subwatershed	Last Chance Gulch (HUC 100301011309)
Other EPA IDs (FRS)	RCRA handler MTD980955579

Cited to the EPA ICIS-NPDES permit file (ECHO download); cross-program IDs from EPA’s FRS facility-registry crosswalk.

Effluent limits and exceedances

0Pollutants on file
0Under a numeric limit
0With a violation of any kind
0With an effluent exceedance

EPA’s limits and effluent violation files hold no pollutant row for NPDES MTR108595.

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

2Single-event violations

Date	What EPA recorded	Agency
May 11, 2021	WW Storm Water Construction - Failure to properly install/implement BMPs	ST6
May 11, 2021	WW Storm Water Construction - Failure to Maintain Records	ST6

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

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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 MTR108595 there.

Nearby on the register

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

This public-records page covers the Clean Water Act construction stormwater discharge permit NPDES MTR108595 held by Sletten Construction Company for the Montana Historical Society & Museum Building in Helena, MT, with an effective status and an issue date of September 1, 2020 and expiration date of December 31, 2022 as recorded in EPA's permit file. The page lists 0 pollutants under a numeric limit and 0 pollutants with an effluent exceedance.