Is YELLOWTAIL DAM GC SYSTEM required to publish a Consumer Confidence Report?

Yes. YELLOWTAIL DAM GC SYSTEM is a community water system, and federal rules (40 CFR 141 Subpart O) require every community water system to publish a Consumer Confidence Report each year.

When is YELLOWTAIL DAM GC SYSTEM’s next Consumer Confidence Report due?

YELLOWTAIL DAM GC SYSTEM’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.

What is a Consumer Confidence Report?

A Consumer Confidence Report (CCR) is the annual drinking water quality report that community water systems must provide to the people they serve. It lists the contaminants detected in the system’s water during the year, where the water comes from, and how the results compare with federal limits. EPA’s revised CCR rule takes effect January 1, 2027, and the first reports in the new format are due July 1, 2027.

YELLOWTAIL, MT · Big Horn County

YELLOWTAIL DAM GC SYSTEM Water System

Consumer Confidence Report status

YELLOWTAIL DAM GC SYSTEM must publish a Consumer Confidence Report — the annual drinking water quality report covering calendar year 2026 — by July 1, 2027.

As of August 1, 2026, EPA's federal records show no open violations for YELLOWTAIL DAM GC SYSTEM.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed August 1, 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): MT0002514
System type: Community Water System
Population served: 125
Service connections: 50
Ownership: federal government
Water source: groundwater (wells)

YELLOWTAIL DAM GC SYSTEM is one of 1,084 community water systems in Montana in the 500 or fewer people size category, serving 125 people from groundwater.

As of August 1, 2026, its federal record holds 61 entries between 1994 and 2024, all of which EPA lists as closed.

Of the 61, 57 are monitoring and reporting requirements — the category that accounts for about four in five of all violations in EPA's national dataset — rather than findings about the water itself. The record involves synthetic organic chemicals, volatile organic chemicals, and inorganic chemicals.

Violation history

Lead Consumer Notice
—
Lead and Copper Rule
December 30, 2024 – February 12, 2025
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2023 – July 10, 2023
Resolved
Monitoring, Regular
—
Nitrate-Nitrite
January 1, 2017 – December 31, 2017
Resolved
Lead Consumer Notice
—
Lead and Copper Rule
December 30, 2015 – February 1, 2016
Resolved
Monitoring, Regular
—
Nitrate-Nitrite
January 1, 2013 – December 31, 2013
Resolved
Consumer Confidence Report Inadequate Reporting
—
Consumer Confidence Rule
October 1, 2012 – February 4, 2014
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2012 – February 4, 2014
Resolved
Monitoring, Regular
—
Asbestos
January 1, 2011 – December 31, 2013
Archived
Lead Consumer Notice
—
Lead and Copper Rule
January 1, 2010 – February 16, 2016
Resolved
Monitoring, Regular
—
Nitrate-Nitrite
January 1, 2006 – December 31, 2006
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2002 – October 2, 2003
Resolved
Monitoring, Regular
—
Endrin
January 1, 2002 – December 31, 2004
Resolved
Monitoring, Regular
—
BHC-GAMMA
January 1, 2002 – December 31, 2004
Resolved
Monitoring, Regular
—
Methoxychlor
January 1, 2002 – December 31, 2004
Resolved
Monitoring, Regular
—
Toxaphene
January 1, 2002 – December 31, 2004
Resolved
Monitoring, Regular
—
Dalapon
January 1, 2002 – December 31, 2004
Resolved
Monitoring, Regular
—
Di(2-ethylhexyl) adipate
January 1, 2002 – December 31, 2004
Resolved
Monitoring, Regular
—
OXAMYL
January 1, 2002 – December 31, 2004
Resolved
Monitoring, Regular
—
Simazine
January 1, 2002 – December 31, 2004
Resolved
Monitoring, Regular
—
Di(2-ethylhexyl) phthalate
January 1, 2002 – December 31, 2004
Resolved
Monitoring, Regular
—
Picloram
January 1, 2002 – December 31, 2004
Resolved
Monitoring, Regular
—
Hexachlorocyclopentadiene
January 1, 2002 – December 31, 2004
Resolved
Monitoring, Regular
—
Aldicarb sulfone
January 1, 2002 – December 31, 2004
Resolved
Monitoring, Regular
—
Carbofuran
January 1, 2002 – December 31, 2004
Resolved
Monitoring, Regular
—
Aldicarb
January 1, 2002 – December 31, 2004
Resolved
Monitoring, Regular
—
Atrazine
January 1, 2002 – December 31, 2004
Resolved
Monitoring, Regular
—
LASSO
January 1, 2002 – December 31, 2004
Resolved
Monitoring, Regular
—
Heptachlor
January 1, 2002 – December 31, 2004
Resolved
Monitoring, Regular
—
Heptachlor epoxide
January 1, 2002 – December 31, 2004
Resolved
Monitoring, Regular
—
2,4-D
January 1, 2002 – December 31, 2004
Resolved
Monitoring, Regular
—
HEXACHLOROBENZENE
January 1, 2002 – December 31, 2004
Resolved
Monitoring, Regular
—
Benzo(a)pyrene
January 1, 2002 – December 31, 2004
Resolved
Monitoring, Regular
—
Pentachlorophenol
January 1, 2002 – December 31, 2004
Resolved
Monitoring, Regular
—
Chlordane
January 1, 2002 – December 31, 2004
Resolved
Monitoring, Regular
—
cis-1,2-Dichloroethylene
January 1, 2002 – December 31, 2004
Resolved
Monitoring, Regular
—
DICHLOROMETHANE
January 1, 2002 – December 31, 2004
Resolved
Monitoring, Regular
—
p-Dichlorobenzene
January 1, 2002 – December 31, 2004
Resolved
Monitoring, Regular
—
Vinyl chloride
January 1, 2002 – December 31, 2004
Resolved
Monitoring, Regular
—
1,1-Dichloroethylene
January 1, 2002 – December 31, 2004
Resolved
Monitoring, Regular
—
trans-1,2-Dichloroethylene
January 1, 2002 – December 31, 2004
Resolved
Monitoring, Regular
—
1,2-Dichloroethane
January 1, 2002 – December 31, 2004
Resolved
Monitoring, Regular
—
1,1,1-Trichloroethane
January 1, 2002 – December 31, 2004
Resolved
Monitoring, Regular
—
Carbon tetrachloride
January 1, 2002 – December 31, 2004
Resolved
Monitoring, Regular
—
Trichloroethylene
January 1, 2002 – December 31, 2004
Resolved
Monitoring, Regular
—
1,1,2-Trichloroethane
January 1, 2002 – December 31, 2004
Resolved
Monitoring, Regular
—
Tetrachloroethylene
January 1, 2002 – December 31, 2004
Resolved
Monitoring, Regular
—
CHLOROBENZENE
January 1, 2002 – December 31, 2004
Resolved
Monitoring, Regular
—
Benzene
January 1, 2002 – December 31, 2004
Resolved
Monitoring, Regular
—
Styrene
January 1, 2002 – December 31, 2004
Resolved
Monitoring, Regular
—
o-Dichlorobenzene
January 1, 2002 – December 31, 2004
Resolved
Monitoring, Regular
—
Arsenic
January 1, 2002 – December 31, 2004
Resolved
Monitoring, Regular
—
Thallium, Total
January 1, 2002 – December 31, 2004
Resolved
Monitoring, Regular
—
Antimony, Total
January 1, 2002 – December 31, 2004
Resolved
Monitoring, Regular
—
Selenium
January 1, 2002 – December 31, 2004
Resolved
Monitoring, Regular
—
Nickel
January 1, 2002 – December 31, 2004
Resolved
Monitoring, Regular
—
Chromium
January 1, 2002 – December 31, 2004
Resolved
Monitoring, Regular
—
Beryllium, Total
January 1, 2002 – December 31, 2004
Resolved
Monitoring, Regular
—
Mercury
January 1, 2002 – December 31, 2004
Resolved
Monitoring, Regular
—
Cadmium
January 1, 2002 – December 31, 2004
Resolved
Monitoring, Regular
—
Barium
January 1, 2002 – December 31, 2004
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
July 1, 1994 – July 31, 1994
Resolved

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

Period	Violation	Contaminant / rule	Health-based	Status
December 30, 2024 – February 12, 2025	Lead Consumer Notice	Lead and Copper Rule	—	Resolved
July 1, 2023 – July 10, 2023	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
January 1, 2017 – December 31, 2017	Monitoring, Regular	Nitrate-Nitrite	—	Resolved
December 30, 2015 – February 1, 2016	Lead Consumer Notice	Lead and Copper Rule	—	Resolved
January 1, 2013 – December 31, 2013	Monitoring, Regular	Nitrate-Nitrite	—	Resolved
October 1, 2012 – February 4, 2014	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	—	Resolved
July 1, 2012 – February 4, 2014	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
January 1, 2011 – December 31, 2013	Monitoring, Regular	Asbestos	—	Archived
January 1, 2010 – February 16, 2016	Lead Consumer Notice	Lead and Copper Rule	—	Resolved
January 1, 2006 – December 31, 2006	Monitoring, Regular	Nitrate-Nitrite	—	Resolved
July 1, 2002 – October 2, 2003	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
January 1, 2002 – December 31, 2004	Monitoring, Regular	Endrin	—	Resolved
January 1, 2002 – December 31, 2004	Monitoring, Regular	BHC-GAMMA	—	Resolved
January 1, 2002 – December 31, 2004	Monitoring, Regular	Methoxychlor	—	Resolved
January 1, 2002 – December 31, 2004	Monitoring, Regular	Toxaphene	—	Resolved
January 1, 2002 – December 31, 2004	Monitoring, Regular	Dalapon	—	Resolved
January 1, 2002 – December 31, 2004	Monitoring, Regular	Di(2-ethylhexyl) adipate	—	Resolved
January 1, 2002 – December 31, 2004	Monitoring, Regular	OXAMYL	—	Resolved
January 1, 2002 – December 31, 2004	Monitoring, Regular	Simazine	—	Resolved
January 1, 2002 – December 31, 2004	Monitoring, Regular	Di(2-ethylhexyl) phthalate	—	Resolved
January 1, 2002 – December 31, 2004	Monitoring, Regular	Picloram	—	Resolved
January 1, 2002 – December 31, 2004	Monitoring, Regular	Hexachlorocyclopentadiene	—	Resolved
January 1, 2002 – December 31, 2004	Monitoring, Regular	Aldicarb sulfone	—	Resolved
January 1, 2002 – December 31, 2004	Monitoring, Regular	Carbofuran	—	Resolved
January 1, 2002 – December 31, 2004	Monitoring, Regular	Aldicarb	—	Resolved
January 1, 2002 – December 31, 2004	Monitoring, Regular	Atrazine	—	Resolved
January 1, 2002 – December 31, 2004	Monitoring, Regular	LASSO	—	Resolved
January 1, 2002 – December 31, 2004	Monitoring, Regular	Heptachlor	—	Resolved
January 1, 2002 – December 31, 2004	Monitoring, Regular	Heptachlor epoxide	—	Resolved
January 1, 2002 – December 31, 2004	Monitoring, Regular	2,4-D	—	Resolved
January 1, 2002 – December 31, 2004	Monitoring, Regular	HEXACHLOROBENZENE	—	Resolved
January 1, 2002 – December 31, 2004	Monitoring, Regular	Benzo(a)pyrene	—	Resolved
January 1, 2002 – December 31, 2004	Monitoring, Regular	Pentachlorophenol	—	Resolved
January 1, 2002 – December 31, 2004	Monitoring, Regular	Chlordane	—	Resolved
January 1, 2002 – December 31, 2004	Monitoring, Regular	cis-1,2-Dichloroethylene	—	Resolved
January 1, 2002 – December 31, 2004	Monitoring, Regular	DICHLOROMETHANE	—	Resolved
January 1, 2002 – December 31, 2004	Monitoring, Regular	p-Dichlorobenzene	—	Resolved
January 1, 2002 – December 31, 2004	Monitoring, Regular	Vinyl chloride	—	Resolved
January 1, 2002 – December 31, 2004	Monitoring, Regular	1,1-Dichloroethylene	—	Resolved
January 1, 2002 – December 31, 2004	Monitoring, Regular	trans-1,2-Dichloroethylene	—	Resolved
January 1, 2002 – December 31, 2004	Monitoring, Regular	1,2-Dichloroethane	—	Resolved
January 1, 2002 – December 31, 2004	Monitoring, Regular	1,1,1-Trichloroethane	—	Resolved
January 1, 2002 – December 31, 2004	Monitoring, Regular	Carbon tetrachloride	—	Resolved
January 1, 2002 – December 31, 2004	Monitoring, Regular	Trichloroethylene	—	Resolved
January 1, 2002 – December 31, 2004	Monitoring, Regular	1,1,2-Trichloroethane	—	Resolved
January 1, 2002 – December 31, 2004	Monitoring, Regular	Tetrachloroethylene	—	Resolved
January 1, 2002 – December 31, 2004	Monitoring, Regular	CHLOROBENZENE	—	Resolved
January 1, 2002 – December 31, 2004	Monitoring, Regular	Benzene	—	Resolved
January 1, 2002 – December 31, 2004	Monitoring, Regular	Styrene	—	Resolved
January 1, 2002 – December 31, 2004	Monitoring, Regular	o-Dichlorobenzene	—	Resolved
January 1, 2002 – December 31, 2004	Monitoring, Regular	Arsenic	—	Resolved
January 1, 2002 – December 31, 2004	Monitoring, Regular	Thallium, Total	—	Resolved
January 1, 2002 – December 31, 2004	Monitoring, Regular	Antimony, Total	—	Resolved
January 1, 2002 – December 31, 2004	Monitoring, Regular	Selenium	—	Resolved
January 1, 2002 – December 31, 2004	Monitoring, Regular	Nickel	—	Resolved
January 1, 2002 – December 31, 2004	Monitoring, Regular	Chromium	—	Resolved
January 1, 2002 – December 31, 2004	Monitoring, Regular	Beryllium, Total	—	Resolved
January 1, 2002 – December 31, 2004	Monitoring, Regular	Mercury	—	Resolved
January 1, 2002 – December 31, 2004	Monitoring, Regular	Cadmium	—	Resolved
January 1, 2002 – December 31, 2004	Monitoring, Regular	Barium	—	Resolved
July 1, 1994 – July 31, 1994	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved

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

Enforcement actions

February 12, 2025State Compliance achieved1 linked violation
February 4, 2025State Violation/Reminder Notice1 linked violation
July 11, 2023State Violation/Reminder Notice1 linked violation
July 10, 2023State Compliance achieved1 linked violation
February 6, 2018State Public Notification received1 linked violation
January 25, 2018State Compliance achieved1 linked violation
January 23, 2018State Public Notification requested1 linked violation
January 23, 2018State Violation/Reminder Notice1 linked violation
February 16, 2016State Compliance achieved1 linked violation
February 1, 2016State Compliance achieved1 linked violation
February 1, 2016State Violation/Reminder Notice1 linked violation
February 10, 2014State Public Notification received1 linked violation
February 4, 2014State Compliance achieved2 linked violations
January 24, 2014State Public Notification requested1 linked violation
January 24, 2014State Violation/Reminder Notice1 linked violation
January 23, 2014State Compliance achieved1 linked violation
January 15, 2014State Public Notification requested1 linked violation
January 15, 2014State Violation/Reminder Notice1 linked violation
November 14, 2012State Violation/Reminder Notice1 linked violation
January 14, 2011State Violation/Reminder Notice1 linked violation
May 15, 2009State Compliance achieved1 linked violation
May 15, 2009State Compliance achieved1 linked violation
May 15, 2009State Compliance achieved1 linked violation
May 15, 2009State Compliance achieved1 linked violation
August 5, 2008State Violation/Reminder Notice1 linked violation
August 5, 2008State Public Notification requested1 linked violation
July 31, 2008State Compliance achieved1 linked violation
January 18, 2007State Compliance achieved1 linked violation
January 14, 2007State Violation/Reminder Notice1 linked violation
December 25, 2005State Violation/Reminder Notice1 linked violation
December 25, 2005State Public Notification requested1 linked violation
June 7, 2005State Compliance achieved37 linked violations
April 15, 2005State Public Notification requested31 linked violations
April 15, 2005State Violation/Reminder Notice42 linked violations
April 14, 2005State Public Notification requested33 linked violations
April 14, 2005State Public Notification requested1 linked violation
April 14, 2005State Violation/Reminder Notice6 linked violations
April 14, 2005State Violation/Reminder Notice2 linked violations
April 14, 2005State Public Notification requested3 linked violations
April 14, 2005State Public Notification requested1 linked violation
April 14, 2005State Violation/Reminder Notice1 linked violation
April 14, 2005State Violation/Reminder Notice76 linked violations
April 14, 2005State Violation/Reminder Notice27 linked violations
August 19, 2004State Compliance achieved1 linked violation
December 23, 2002State Violation/Reminder Notice1 linked violation

Common questions

Is YELLOWTAIL DAM GC SYSTEM required to publish a Consumer Confidence Report?: Yes. YELLOWTAIL DAM GC SYSTEM is a community water system, and federal rules (40 CFR 141 Subpart O) require every community water system to publish a Consumer Confidence Report each year.
When is YELLOWTAIL DAM GC SYSTEM’s next Consumer Confidence Report due?: YELLOWTAIL DAM GC SYSTEM’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does YELLOWTAIL DAM GC SYSTEM have any open drinking water violations on record?: As of August 1, 2026, EPA's federal records show no open violations for YELLOWTAIL DAM GC SYSTEM.
What is a Consumer Confidence Report?: A Consumer Confidence Report (CCR) is the annual drinking water quality report that community water systems must provide to the people they serve. It lists the contaminants detected in the system’s water during the year, where the water comes from, and how the results compare with federal limits. EPA’s revised CCR rule takes effect January 1, 2027, and the first reports in the new format are due July 1, 2027.

Contact

CURTIS, CHRIS

406-666-3201

YELLOWTAIL, MT 59035