Is DUNCAN RANCH COLONY required to publish a Consumer Confidence Report?

Yes. DUNCAN RANCH COLONY 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 DUNCAN RANCH COLONY’s next Consumer Confidence Report due?

DUNCAN RANCH COLONY’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.

HARLOWTON, MT · Wheatland County

DUNCAN RANCH COLONY Water System

Consumer Confidence Report status

DUNCAN RANCH COLONY 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 DUNCAN RANCH COLONY.

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): MT0000418
System type: Community Water System
Population served: 96
Service connections: 17
Ownership: privately owned
Water source: groundwater (wells)

DUNCAN RANCH COLONY is one of 1,084 community water systems in Montana in the 500 or fewer people size category, serving 96 people from groundwater.

As of August 1, 2026, its federal record holds 51 entries between 1995 and 2021, all of which EPA lists as closed. Nothing has been added since 2021.

Of the 51, 43 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, the Total Coliform Rules, and the Lead and Copper Rule.

Violation history

Lead Consumer Notice
—
Lead and Copper Rule
December 30, 2021 – January 24, 2022
Resolved
Monitoring, Routine (RTCR)
—
Revised Total Coliform Rule
June 1, 2021 – June 30, 2021
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2019 – August 5, 2019
Resolved
Lead Consumer Notice
—
Lead and Copper Rule
December 30, 2015 – February 1, 2016
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
December 1, 2014 – December 31, 2014
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
July 1, 2013 – July 31, 2013
Resolved
Monitoring, Source Water (GWR)
—
E. COLI
November 1, 2012 – December 26, 2012
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
November 1, 2012 – November 30, 2012
Resolved
Monitoring, Source Water (GWR)
—
E. COLI
September 1, 2012 – October 24, 2012
Resolved
Monitoring, Source Water (GWR)
—
E. COLI
September 1, 2012 – October 24, 2012
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
August 1, 2011 – August 31, 2011
Resolved
Monitoring, Source Water (GWR)
—
E. COLI
July 1, 2011 – March 7, 2013
Resolved
Monitoring, Repeat Major (TCR)
—
Coliform (TCR)
July 1, 2011 – July 31, 2011
Resolved
Lead Consumer Notice
—
Lead and Copper Rule
January 1, 2010 – March 3, 2011
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
September 1, 2007 – September 30, 2007
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
August 1, 2007 – August 31, 2007
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
November 1, 2005 – November 30, 2005
Resolved
Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
October 1, 2004 – September 28, 2005
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
August 1, 2002 – August 31, 2002
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
March 1, 2002 – March 31, 2002
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
December 1, 2001 – December 31, 2001
Resolved
Monitoring, Regular
—
Benzo(a)pyrene
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
Pentachlorophenol
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
Barium
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
Beryllium, Total
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
Thallium, Total
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
Total Polychlorinated Biphenyls (PCB)
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
Endrin
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
BHC-GAMMA
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
Methoxychlor
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
Dalapon
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
Endothall
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
Di(2-ethylhexyl) adipate
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
Simazine
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
Di(2-ethylhexyl) phthalate
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
Dinoseb
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
Hexachlorocyclopentadiene
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
Aldicarb sulfoxide
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
Aldicarb sulfone
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
Carbofuran
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
Aldicarb
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
Atrazine
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
Heptachlor
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
Heptachlor epoxide
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
2,4-D
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
2,4,5-TP
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
HEXACHLOROBENZENE
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
August 1, 1997 – August 31, 1997
Resolved
Monitoring, Repeat Major (TCR)
—
Coliform (TCR)
July 1, 1997 – July 31, 1997
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
April 1, 1995 – April 30, 1995
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
February 1, 1995 – February 28, 1995
Resolved

Resolved addressed and confirmed by the state

Period	Violation	Contaminant / rule	Health-based	Status
December 30, 2021 – January 24, 2022	Lead Consumer Notice	Lead and Copper Rule	—	Resolved
June 1, 2021 – June 30, 2021	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	—	Resolved
July 1, 2019 – August 5, 2019	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
December 30, 2015 – February 1, 2016	Lead Consumer Notice	Lead and Copper Rule	—	Resolved
December 1, 2014 – December 31, 2014	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
July 1, 2013 – July 31, 2013	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
November 1, 2012 – December 26, 2012	Monitoring, Source Water (GWR)	E. COLI	—	Resolved
November 1, 2012 – November 30, 2012	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
September 1, 2012 – October 24, 2012	Monitoring, Source Water (GWR)	E. COLI	—	Resolved
September 1, 2012 – October 24, 2012	Monitoring, Source Water (GWR)	E. COLI	—	Resolved
August 1, 2011 – August 31, 2011	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
July 1, 2011 – March 7, 2013	Monitoring, Source Water (GWR)	E. COLI	—	Resolved
July 1, 2011 – July 31, 2011	Monitoring, Repeat Major (TCR)	Coliform (TCR)	—	Resolved
January 1, 2010 – March 3, 2011	Lead Consumer Notice	Lead and Copper Rule	—	Resolved
September 1, 2007 – September 30, 2007	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
August 1, 2007 – August 31, 2007	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
November 1, 2005 – November 30, 2005	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
October 1, 2004 – September 28, 2005	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Resolved
August 1, 2002 – August 31, 2002	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
March 1, 2002 – March 31, 2002	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
December 1, 2001 – December 31, 2001	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	Benzo(a)pyrene	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	Pentachlorophenol	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	Barium	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	Beryllium, Total	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	Thallium, Total	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	Total Polychlorinated Biphenyls (PCB)	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	Endrin	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	BHC-GAMMA	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	Methoxychlor	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	Dalapon	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	Endothall	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	Di(2-ethylhexyl) adipate	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	Simazine	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	Di(2-ethylhexyl) phthalate	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	Dinoseb	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	Hexachlorocyclopentadiene	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	Aldicarb sulfoxide	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	Aldicarb sulfone	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	Carbofuran	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	Aldicarb	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	Atrazine	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	Heptachlor	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	Heptachlor epoxide	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	2,4-D	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	2,4,5-TP	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	HEXACHLOROBENZENE	—	Resolved
August 1, 1997 – August 31, 1997	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Resolved
July 1, 1997 – July 31, 1997	Monitoring, Repeat Major (TCR)	Coliform (TCR)	—	Resolved
April 1, 1995 – April 30, 1995	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
February 1, 1995 – February 28, 1995	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved

Resolved addressed and confirmed by the state

Enforcement actions

February 20, 2025State Compliance achievedgeneral compliance action — not tied to a specific violation on record
January 15, 2025State Public Notification requestedgeneral compliance action — not tied to a specific violation on record
January 15, 2025State Violation/Reminder Noticegeneral compliance action — not tied to a specific violation on record
January 24, 2022State Compliance achieved1 linked violation
January 4, 2022State Violation/Reminder Notice1 linked violation
July 16, 2021State Public Notification requested1 linked violation
July 16, 2021State Violation/Reminder Notice1 linked violation
July 6, 2021State Compliance achieved1 linked violation
August 5, 2019State Compliance achieved1 linked violation
July 17, 2019State Violation/Reminder Notice1 linked violation
February 1, 2016State Violation/Reminder Notice1 linked violation
February 1, 2016State Compliance achieved1 linked violation
January 20, 2015State Compliance achieved1 linked violation
December 31, 2014State Violation/Reminder Notice2 linked violations
December 31, 2014State Violation/Reminder Notice1 linked violation
August 29, 2013State Public Notification received1 linked violation
August 26, 2013State Compliance achieved1 linked violation
August 7, 2013State Violation/Reminder Notice2 linked violations
August 7, 2013State Public Notification requested1 linked violation
August 7, 2013State Violation/Reminder Notice1 linked violation
March 7, 2013State Compliance achieved1 linked violation
December 18, 2012State Public Notification requested2 linked violations
December 6, 2012State Compliance achieved2 linked violations
December 3, 2012State Public Notification requested2 linked violations
December 3, 2012State Violation/Reminder Notice2 linked violations
October 18, 2012State Public Notification requested2 linked violations
October 18, 2012State Public Notification requested2 linked violations
September 22, 2011State Violation/Reminder Notice2 linked violations
September 22, 2011State Compliance achieved1 linked violation
September 2, 2011State Violation/Reminder Notice2 linked violations
September 2, 2011State Public Notification requested1 linked violation
August 30, 2011State Public Notification received1 linked violation
August 18, 2011State Public Notification requested1 linked violation
March 3, 2011State Compliance achieved2 linked violations
August 12, 2009State Compliance achieved4 linked violations
August 12, 2009State Compliance achieved2 linked violations
August 12, 2009State Compliance achieved4 linked violations
December 31, 2008State Compliance achieved23 linked violations
July 30, 2008State Compliance achieved8 linked violations
May 27, 2008State Compliance achieved8 linked violations
January 4, 2005State Public Notification requested3 linked violations
July 25, 2002State Public Notification requested1 linked violation
July 25, 2002State Violation/Reminder Notice2 linked violations
July 12, 2002State Violation/Reminder Notice11 linked violations
July 12, 2002State Public Notification requested10 linked violations
June 11, 2002State Compliance achieved1 linked violation
June 3, 2002State Compliance achieved5 linked violations
April 21, 2002State Violation/Reminder Notice1 linked violation
April 21, 2002State Public Notification requested1 linked violation
January 19, 2002State Public Notification requested2 linked violations
May 15, 2001State Compliance achieved1 linked violation
December 31, 2000State Violation/Reminder Notice1 linked violation

Common questions

Is DUNCAN RANCH COLONY required to publish a Consumer Confidence Report?: Yes. DUNCAN RANCH COLONY 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 DUNCAN RANCH COLONY’s next Consumer Confidence Report due?: DUNCAN RANCH COLONY’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does DUNCAN RANCH COLONY have any open drinking water violations on record?: As of August 1, 2026, EPA's federal records show no open violations for DUNCAN RANCH COLONY.
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

WALDNER, JEFFREY I

406-380-2933

HARLOWTON, MT 59036