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Clean Water Act discharge permit · NPDES MT0030350

REC SILICON, Silver Bow, MT: NPDES MT0030350 discharge permit, effluent exceedances, inspections, penalties

REC SILICON, held by REC ADVANCED SILICON MATERIALS LLC, holds NPDES permit MT0030350, which discharges to Silver Bow Creek Via Sheep Gulch. EPA’s file records it issued September 29, 2010 and expiring October 31, 2015. 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 filedREC SILICON
Permittee as filedREC ADVANCED SILICON MATERIALS LLC
NPDES IDMT0030350
Permit statusAdministratively continued (past its expiration date and still in force until reissued)
Permit typeIndividual permit
Discharger classMinor discharger
Facility typeNot a publicly owned treatment works
ProgramIndustrial stormwater
IssuedSeptember 29, 2010
Expiration dateOctober 31, 2015
AddressSilver Bow, MT 59750
Receiving waterSILVER BOW CREEK VIA SHEEP GULCH
SubwatershedSilver Bow Creek-McCleery Gulch (HUC 170102010205)
Other EPA IDs (FRS)RCRA handler MTR000004754

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

Effluent limits and exceedances

An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant.

Pollutant or measureLimitsViolations, any kindEffluent exceedancesLatest exceedanceLargest exceedance, as filed
Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia01616September 30, 2024
BOD, 5-day, 20 deg. C41514May 31, 202599,999% over the limit
Solids, total suspended51311June 30, 2020131% over the limit
Chlorine, total residual41010March 31, 20224,900% over the limit
Copper, total recoverable4109February 28, 2017341% over the limit
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia087March 31, 200899,999% over the limit
pH486June 30, 2016
Oxygen demand, chem. [high level] [COD]055July 31, 1998350% over the limit
Oxygen, dissolved [DO]433August 31, 20029% over the limit
Solids, total dissolved062November 30, 200821% over the limit
Solids, total dissolved [TDS]222November 30, 201638% over the limit
Aluminum, dissolved [as Al]231July 31, 202647% over the limit
Nitrogen, total [as N]221July 31, 202611% over the limit
Phosphorus, total [as P]221April 30, 1998226% over the limit
Chemical Oxygen Demand [COD]540
Oil and grease visual340
Flow rate020
Antimony, total recoverable020
Water level at sample collection time020
%Effect Static Renewal 7Day Chronic Pimephales promelas020
Nickel, total recoverable410
Zinc, total recoverable410
Nitrogen, Kjeldahl, total [as N]210
Nitrite + Nitrate total [as N]210
Pass/Fail Static 48Hr Acute Ceriodaphnia dubia110
LC50 Static 48Hr Acute Pimephales promelas110
Arsenic, total recoverable010
Iron, total recoverable010
Selenium, total recoverable010
Cadmium, total recoverable010
Lead, total recoverable010
Flow rate900
Oil and grease, hexane extr method200
Methylene chloride200
Di[2-ethylhexyl] phthalate [DEHP]200
Nitrogen, ammonia total [as N]100
Arsenic, total [as As]100
Copper, total [as Cu]100
Lead, total [as Pb]100
Zinc, total [as Zn]100
Duration of discharge100
Pass/Fail Static Renewal 48Hr Acute Ceriodaphnia dubia100
Pass/Fail Static Renewal 7Day Chronic Pimephales promelas100

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

DateWhat EPA recordedAgency
September 22, 2022Reporting Violations - Improper/ Incorrect ReportingST6
September 22, 2022Management Practice Violations - Improper Operation and MaintenanceST6
September 22, 2022Management Practice Violations - Failure to Conduct InspectionsST6
September 22, 2022WW Storm Water Construction - Failure to develop any or adequate SWPPP/SWMPST6

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.

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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 MT0030350 there.

Nearby on the register

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

What this page shows

This public-records page covers Clean Water Act discharge permit NPDES MT0030350 for REC SILICON in Silver Bow, MT, held by REC ADVANCED SILICON MATERIALS LLC and discharging to Silver Bow Creek via Sheep Gulch. The permit is listed as administratively continued, with 14 pollutants under a numeric limit and 14 pollutants with an effluent exceedance, and it is in the Silver Bow Creek-McCleery Gulch subwatershed (HUC 170102010205).