WEST YELLOWSTONE, MT · Gallatin County

WEST YELLOWSTONE TOWN OF Water System

Current status

No open violations on record as of July 4, 2026.

This system's next federally required Consumer Confidence Report is due July 1, 2027, under the EPA's revised reporting rule.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed July 4, 2026. This is a record-keeping and public-information tool — it does not replace Montana’s official records. Always confirm current status with Montana before making decisions based on this information.

System facts

System ID (PWSID): MT0003136
System type: Community Water System
Population served: 9,899
Service connections: 628
Ownership: local government
Water source: groundwater (wells)

Violation history

Monitoring, Regular
—
Fluoride
July 1, 2021 – September 30, 2021
Archived
Monitoring, Regular
—
Arsenic
April 1, 2021 – June 30, 2021
Resolved
Monitoring, Source Water (GWR)
—
E. COLI
August 28, 2019 – September 23, 2019
Resolved
Lead Consumer Notice
—
Lead and Copper Rule
April 1, 2018 – June 25, 2018
Resolved
Monitoring, Regular
—
Fluoride
January 1, 2018 – March 5, 2018
Resolved
Monitoring, Regular
—
Arsenic
January 1, 2018 – March 31, 2018
Resolved
Monitoring, Regular
—
Fluoride
January 1, 2018 – March 31, 2018
Resolved
Monitoring, Source Water (GWR)
—
E. COLI
December 7, 2017 – January 4, 2018
Resolved
Monitoring, Regular
—
2,4,5-TP
July 1, 2017 – September 30, 2017
Resolved
Monitoring, Regular
—
2,4-D
July 1, 2017 – September 30, 2017
Resolved
Monitoring, Regular
—
Heptachlor epoxide
July 1, 2017 – September 30, 2017
Resolved
Monitoring, Regular
—
Heptachlor
July 1, 2017 – September 30, 2017
Resolved
Monitoring, Regular
—
LASSO
July 1, 2017 – September 30, 2017
Resolved
Monitoring, Regular
—
Atrazine
July 1, 2017 – September 30, 2017
Resolved
Monitoring, Regular
—
Carbofuran
July 1, 2017 – September 30, 2017
Resolved
Monitoring, Regular
—
Hexachlorocyclopentadiene
July 1, 2017 – September 30, 2017
Resolved
Monitoring, Regular
—
Dinoseb
July 1, 2017 – September 30, 2017
Resolved
Monitoring, Regular
—
Picloram
July 1, 2017 – September 30, 2017
Resolved
Monitoring, Regular
—
Di(2-ethylhexyl) phthalate
July 1, 2017 – September 30, 2017
Resolved
Monitoring, Regular
—
Simazine
July 1, 2017 – September 30, 2017
Resolved
Monitoring, Regular
—
OXAMYL
July 1, 2017 – September 30, 2017
Resolved
Monitoring, Regular
—
Di(2-ethylhexyl) adipate
July 1, 2017 – September 30, 2017
Resolved
Monitoring, Regular
—
Dalapon
July 1, 2017 – September 30, 2017
Resolved
Monitoring, Regular
—
Toxaphene
July 1, 2017 – September 30, 2017
Resolved
Monitoring, Regular
—
Methoxychlor
July 1, 2017 – September 30, 2017
Resolved
Monitoring, Regular
—
BHC-GAMMA
July 1, 2017 – September 30, 2017
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2017 – August 3, 2017
Resolved
Monitoring, Regular
—
Endrin
July 1, 2017 – September 30, 2017
Resolved
Monitoring, Regular
—
Arsenic
July 1, 2017 – September 30, 2017
Resolved
Monitoring, Regular
—
Combined Radium (-226 and -228)
July 1, 2017 – September 30, 2017
Resolved
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
July 1, 2017 – September 30, 2017
Resolved
Monitoring, Regular
—
Chlordane
July 1, 2017 – September 30, 2017
Resolved
Monitoring, Regular
—
Pentachlorophenol
July 1, 2017 – September 30, 2017
Resolved
Monitoring, Regular
—
Benzo(a)pyrene
July 1, 2017 – September 30, 2017
Resolved
Monitoring, Regular
—
HEXACHLOROBENZENE
July 1, 2017 – September 30, 2017
Resolved
Monitoring, Source Water (GWR)
—
E. COLI
May 16, 2017 – July 20, 2017
Resolved
Monitoring, Regular
—
Arsenic
April 1, 2017 – May 5, 2017
Resolved
Treatment Technique, Level 1 Assessment (RTCR)
Health-based
Revised Total Coliform Rule
October 17, 2016 – November 10, 2016
Resolved
Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
October 1, 2016 – September 26, 2016
Resolved
Monitoring, Routine (RTCR)
—
Revised Total Coliform Rule
October 1, 2016 – October 31, 2016
Resolved
Monitoring, Regular
—
Arsenic
October 1, 2016 – December 31, 2016
Resolved
Monitoring, Regular
—
Fluoride
October 1, 2016 – December 13, 2016
Resolved
Monitoring, Regular
—
Fluoride
October 1, 2016 – December 13, 2016
Resolved
Monitoring, Routine (RTCR)
—
Revised Total Coliform Rule
September 1, 2016 – September 30, 2016
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2015 – July 23, 2015
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
December 1, 2014 – December 31, 2014
Resolved
Monitoring, Source Water (GWR)
—
E. COLI
August 19, 2014 – April 22, 2015
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
November 1, 2013 – November 30, 2013
Resolved
Monitoring, Source Water (GWR)
—
E. COLI
July 1, 2012 – May 22, 2013
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
April 1, 2012 – April 11, 2012
Resolved
Monitoring, Regular
—
Hexachlorocyclopentadiene
January 1, 2011 – November 12, 2013
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
August 1, 2010 – August 31, 2010
Resolved
Monitoring, Regular
—
Nitrate-Nitrite
January 1, 2009 – December 31, 2009
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
August 1, 2008 – August 31, 2008
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2008 – August 14, 2008
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
July 1, 2008 – July 31, 2008
Resolved
Monitoring, Regular
—
Aldicarb sulfone
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
Aldicarb sulfoxide
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
Hexachlorocyclopentadiene
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
Dinoseb
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
Picloram
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
Di(2-ethylhexyl) phthalate
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
Simazine
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
OXAMYL
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
Di(2-ethylhexyl) adipate
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
Dalapon
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
Methoxychlor
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
BHC-GAMMA
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
Endrin
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
Toxaphene
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
Chlordane
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
Pentachlorophenol
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
Benzo(a)pyrene
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
HEXACHLOROBENZENE
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
2,4,5-TP
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
2,4-D
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
Heptachlor epoxide
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
Heptachlor
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
LASSO
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
Atrazine
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
Aldicarb
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
Carbofuran
January 1, 2008 – December 31, 2010
Archived
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2007 – July 31, 2008
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
May 1, 2006 – May 31, 2006
Resolved
Monitoring, Repeat Major (TCR)
—
Coliform (TCR)
January 1, 1995 – January 31, 1995
Resolved

Archived closed in EPA's records (typically due to age or a data correction)Resolved addressed and confirmed by the state

Period	Violation	Contaminant / rule	Health-based	Status
July 1, 2021 – September 30, 2021	Monitoring, Regular	Fluoride	—	Archived
April 1, 2021 – June 30, 2021	Monitoring, Regular	Arsenic	—	Resolved
August 28, 2019 – September 23, 2019	Monitoring, Source Water (GWR)	E. COLI	—	Resolved
April 1, 2018 – June 25, 2018	Lead Consumer Notice	Lead and Copper Rule	—	Resolved
January 1, 2018 – March 5, 2018	Monitoring, Regular	Fluoride	—	Resolved
January 1, 2018 – March 31, 2018	Monitoring, Regular	Arsenic	—	Resolved
January 1, 2018 – March 31, 2018	Monitoring, Regular	Fluoride	—	Resolved
December 7, 2017 – January 4, 2018	Monitoring, Source Water (GWR)	E. COLI	—	Resolved
July 1, 2017 – September 30, 2017	Monitoring, Regular	2,4,5-TP	—	Resolved
July 1, 2017 – September 30, 2017	Monitoring, Regular	2,4-D	—	Resolved
July 1, 2017 – September 30, 2017	Monitoring, Regular	Heptachlor epoxide	—	Resolved
July 1, 2017 – September 30, 2017	Monitoring, Regular	Heptachlor	—	Resolved
July 1, 2017 – September 30, 2017	Monitoring, Regular	LASSO	—	Resolved
July 1, 2017 – September 30, 2017	Monitoring, Regular	Atrazine	—	Resolved
July 1, 2017 – September 30, 2017	Monitoring, Regular	Carbofuran	—	Resolved
July 1, 2017 – September 30, 2017	Monitoring, Regular	Hexachlorocyclopentadiene	—	Resolved
July 1, 2017 – September 30, 2017	Monitoring, Regular	Dinoseb	—	Resolved
July 1, 2017 – September 30, 2017	Monitoring, Regular	Picloram	—	Resolved
July 1, 2017 – September 30, 2017	Monitoring, Regular	Di(2-ethylhexyl) phthalate	—	Resolved
July 1, 2017 – September 30, 2017	Monitoring, Regular	Simazine	—	Resolved
July 1, 2017 – September 30, 2017	Monitoring, Regular	OXAMYL	—	Resolved
July 1, 2017 – September 30, 2017	Monitoring, Regular	Di(2-ethylhexyl) adipate	—	Resolved
July 1, 2017 – September 30, 2017	Monitoring, Regular	Dalapon	—	Resolved
July 1, 2017 – September 30, 2017	Monitoring, Regular	Toxaphene	—	Resolved
July 1, 2017 – September 30, 2017	Monitoring, Regular	Methoxychlor	—	Resolved
July 1, 2017 – September 30, 2017	Monitoring, Regular	BHC-GAMMA	—	Resolved
July 1, 2017 – August 3, 2017	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
July 1, 2017 – September 30, 2017	Monitoring, Regular	Endrin	—	Resolved
July 1, 2017 – September 30, 2017	Monitoring, Regular	Arsenic	—	Resolved
July 1, 2017 – September 30, 2017	Monitoring, Regular	Combined Radium (-226 and -228)	—	Resolved
July 1, 2017 – September 30, 2017	Monitoring, Regular	Gross Alpha, Excl. Radon and U	—	Resolved
July 1, 2017 – September 30, 2017	Monitoring, Regular	Chlordane	—	Resolved
July 1, 2017 – September 30, 2017	Monitoring, Regular	Pentachlorophenol	—	Resolved
July 1, 2017 – September 30, 2017	Monitoring, Regular	Benzo(a)pyrene	—	Resolved
July 1, 2017 – September 30, 2017	Monitoring, Regular	HEXACHLOROBENZENE	—	Resolved
May 16, 2017 – July 20, 2017	Monitoring, Source Water (GWR)	E. COLI	—	Resolved
April 1, 2017 – May 5, 2017	Monitoring, Regular	Arsenic	—	Resolved
October 17, 2016 – November 10, 2016	Treatment Technique, Level 1 Assessment (RTCR)	Revised Total Coliform Rule	Health-based	Resolved
October 1, 2016 – September 26, 2016	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Resolved
October 1, 2016 – October 31, 2016	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	—	Resolved
October 1, 2016 – December 31, 2016	Monitoring, Regular	Arsenic	—	Resolved
October 1, 2016 – December 13, 2016	Monitoring, Regular	Fluoride	—	Resolved
October 1, 2016 – December 13, 2016	Monitoring, Regular	Fluoride	—	Resolved
September 1, 2016 – September 30, 2016	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	—	Resolved
July 1, 2015 – July 23, 2015	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
December 1, 2014 – December 31, 2014	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Resolved
August 19, 2014 – April 22, 2015	Monitoring, Source Water (GWR)	E. COLI	—	Resolved
November 1, 2013 – November 30, 2013	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Resolved
July 1, 2012 – May 22, 2013	Monitoring, Source Water (GWR)	E. COLI	—	Resolved
April 1, 2012 – April 11, 2012	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
January 1, 2011 – November 12, 2013	Monitoring, Regular	Hexachlorocyclopentadiene	—	Resolved
August 1, 2010 – August 31, 2010	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Resolved
January 1, 2009 – December 31, 2009	Monitoring, Regular	Nitrate-Nitrite	—	Resolved
August 1, 2008 – August 31, 2008	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
July 1, 2008 – August 14, 2008	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
July 1, 2008 – July 31, 2008	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
January 1, 2008 – December 31, 2010	Monitoring, Regular	Aldicarb sulfone	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	Aldicarb sulfoxide	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	Hexachlorocyclopentadiene	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	Dinoseb	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	Picloram	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	Di(2-ethylhexyl) phthalate	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	Simazine	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	OXAMYL	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	Di(2-ethylhexyl) adipate	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	Dalapon	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	Methoxychlor	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	BHC-GAMMA	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	Endrin	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	Toxaphene	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	Chlordane	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	Pentachlorophenol	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	Benzo(a)pyrene	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	HEXACHLOROBENZENE	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	2,4,5-TP	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	2,4-D	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	Heptachlor epoxide	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	Heptachlor	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	LASSO	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	Atrazine	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	Aldicarb	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	Carbofuran	—	Archived
July 1, 2007 – July 31, 2008	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
May 1, 2006 – May 31, 2006	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
January 1, 1995 – January 31, 1995	Monitoring, Repeat Major (TCR)	Coliform (TCR)	—	Resolved

Archived closed in EPA's records (typically due to age or a data correction)Resolved addressed and confirmed by the state

Enforcement actions

September 30, 2019State Public Notification requested3 linked violations
September 23, 2019State Compliance achieved6 linked violations
June 25, 2018State Compliance achieved12 linked violations
March 5, 2018State Compliance achieved3 linked violations
December 15, 2017State Public Notification requested3 linked violations
November 9, 2017State Compliance achieved1 linked violation
November 9, 2017State Compliance achieved23 linked violations
November 9, 2017State Compliance achieved4 linked violations
October 18, 2017State Public Notification requested2 linked violations
October 18, 2017State Public Notification requested2 linked violations
October 18, 2017State Violation/Reminder Notice2 linked violations
October 18, 2017State Violation/Reminder Notice23 linked violations
July 20, 2017State Compliance achieved1 linked violation
July 20, 2017State Violation/Reminder Notice1 linked violation
July 18, 2017State Public Notification requested1 linked violation
June 19, 2017State Public Notification requested1 linked violation
June 19, 2017State Violation/Reminder Notice1 linked violation
February 17, 2017State Violation/Reminder Notice1 linked violation
February 17, 2017State Public Notification requested1 linked violation
February 17, 2017State Violation/Reminder Notice1 linked violation
February 17, 2017State Public Notification requested1 linked violation
February 3, 2017State Public Notification requested2 linked violations
February 3, 2017State Violation/Reminder Notice2 linked violations
January 17, 2017State Compliance achieved2 linked violations
December 13, 2016State Compliance achieved1 linked violation
December 13, 2016State Compliance achieved1 linked violation
December 13, 2016State Compliance achieved1 linked violation
November 29, 2016State Violation/Reminder Notice1 linked violation
November 29, 2016State Public Notification requested1 linked violation
November 15, 2016State Violation/Reminder Notice1 linked violation
November 15, 2016State Public Notification requested1 linked violation
November 10, 2016State Compliance achieved1 linked violation
October 24, 2016State Public Notification requested1 linked violation
October 24, 2016State Violation/Reminder Notice1 linked violation
October 17, 2016State Violation/Reminder Notice1 linked violation
October 17, 2016State Public Notification requested1 linked violation
September 26, 2016State Compliance achieved1 linked violation
July 23, 2015State Compliance achieved1 linked violation
April 22, 2015State Compliance achieved1 linked violation
February 3, 2015State Public Notification received1 linked violation
January 21, 2015State Compliance achieved1 linked violation
January 15, 2015State Public Notification requested1 linked violation
January 15, 2015State Violation/Reminder Notice1 linked violation
September 18, 2014State Public Notification requested1 linked violation
September 18, 2014State Violation/Reminder Notice1 linked violation
January 24, 2014State Violation/Reminder Notice2 linked violations
January 24, 2014State Public Notification requested2 linked violations
December 17, 2013State Compliance achieved1 linked violation
December 16, 2013State Public Notification requested1 linked violation
December 16, 2013State Violation/Reminder Notice3 linked violations
November 12, 2013State Compliance achieved1 linked violation
May 22, 2013State Compliance achieved2 linked violations
May 15, 2012State Public Notification requested2 linked violations
September 17, 2010State Violation/Reminder Notice3 linked violations
September 17, 2010State Public Notification requested3 linked violations
February 2, 2010State Public Notification received2 linked violations
May 15, 2009State Compliance achieved2 linked violations
May 15, 2009State Compliance achieved2 linked violations
August 15, 2008State Public Notification requested1 linked violation
August 14, 2008State Compliance achieved3 linked violations
June 27, 2006State Violation/Reminder Notice4 linked violations

Contact

BROWN, JON M

406-646-7795

WEST YELLOWSTONE, MT 59758