DARBY, MT · Ravalli County

DARBY 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): MT0000195
System type: Community Water System
Population served: 850
Service connections: 494
Ownership: local government
Water source: groundwater (wells)

Violation history

OCCT/SOWT Treatment Installation/Demonstration
Health-based
Lead and Copper Rule
August 6, 2024 – January 8, 2026
Resolved
Monitoring, Routine (RTCR)
—
Revised Total Coliform Rule
May 1, 2023 – May 22, 2023
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2021 – July 26, 2021
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2017 – July 27, 2017
Resolved
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
July 1, 2010 – September 30, 2010
Resolved
Monitoring, Regular
—
Combined Radium (-226 and -228)
July 1, 2010 – September 30, 2010
Resolved
Water Quality Parameter M/R
—
Lead and Copper Rule
January 1, 2006 – June 30, 2006
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
September 1, 2005 – September 30, 2005
Resolved
OCCT/SOWT Study/Recommendation
Health-based
Lead and Copper Rule
January 1, 2005 – July 5, 2007
Resolved
Initial Tap Sampling for Pb and Cu
—
Lead and Copper Rule
July 1, 2004 – February 9, 2007
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
July 1, 2004 – July 31, 2004
Resolved
Initial Tap Sampling for Pb and Cu
—
Lead and Copper Rule
October 1, 2003 – September 21, 2005
Resolved
Initial Tap Sampling for Pb and Cu
—
Lead and Copper Rule
July 1, 2002 – September 21, 2005
Resolved
Initial Tap Sampling for Pb and Cu
—
Lead and Copper Rule
October 1, 2001 – September 21, 2005
Resolved
Water Quality Parameter M/R
—
Lead and Copper Rule
July 1, 2001 – December 31, 2001
Resolved
Water Quality Parameter M/R
—
Lead and Copper Rule
July 1, 2001 – December 31, 2001
Resolved
Water Quality Parameter M/R
—
Lead and Copper Rule
January 1, 2001 – June 30, 2001
Resolved
Water Quality Parameter M/R
—
Lead and Copper Rule
July 1, 2000 – December 31, 2000
Resolved
Water Quality Parameter M/R
—
Lead and Copper Rule
July 1, 2000 – December 31, 2000
Resolved
Water Quality Parameter M/R
—
Lead and Copper Rule
July 1, 2000 – December 31, 2000
Resolved
Water Quality Parameter M/R
—
Lead and Copper Rule
January 1, 2000 – June 30, 2000
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
July 1, 1999 – July 31, 1999
Resolved
Monitoring, Regular
—
Aldicarb
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
Atrazine
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
LASSO
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
2,3,7,8-TCDD
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
Heptachlor epoxide
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, Regular
—
Benzo(a)pyrene
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
Pentachlorophenol
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
Total Polychlorinated Biphenyls (PCB)
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
1,2-DIBROMO-3-CHLOROPROPANE
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
Methoxychlor
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
Diquat
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
—
2,3,7,8-TCDD
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
Heptachlor
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, Regular
—
Pentachlorophenol
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
Total Polychlorinated Biphenyls (PCB)
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
1,2-DIBROMO-3-CHLOROPROPANE
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
ETHYLENE DIBROMIDE
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
Beryllium, Total
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
Nickel
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
—
Benzo(a)pyrene
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
1,2,4-Trichlorobenzene
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
Xylenes, Total
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
DICHLOROMETHANE
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
p-Dichlorobenzene
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
Vinyl chloride
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
1,1-Dichloroethylene
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
1,2-Dichloroethane
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
1,1,2-Trichloroethane
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
Tetrachloroethylene
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
DICHLOROMETHANE
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
o-Dichlorobenzene
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
1,1-Dichloroethylene
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
Dalapon
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
Diquat
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
Glyphosate
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
—
Picloram
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, Repeat Major (TCR)
—
Coliform (TCR)
August 1, 1998 – August 31, 1998
Resolved
Monitoring, Regular
—
Nitrate
January 1, 1993 – December 31, 1993
Resolved
Maximum Contaminant Level Violation, Acute (TCR)
Health-based
Coliform (TCR)
August 1, 1992 – August 31, 1992
Resolved

Resolved addressed and confirmed by the state

Period	Violation	Contaminant / rule	Health-based	Status
August 6, 2024 – January 8, 2026	OCCT/SOWT Treatment Installation/Demonstration	Lead and Copper Rule	Health-based	Resolved
May 1, 2023 – May 22, 2023	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	—	Resolved
July 1, 2021 – July 26, 2021	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
July 1, 2017 – July 27, 2017	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
July 1, 2010 – September 30, 2010	Monitoring, Regular	Gross Alpha, Excl. Radon and U	—	Resolved
July 1, 2010 – September 30, 2010	Monitoring, Regular	Combined Radium (-226 and -228)	—	Resolved
January 1, 2006 – June 30, 2006	Water Quality Parameter M/R	Lead and Copper Rule	—	Resolved
September 1, 2005 – September 30, 2005	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
January 1, 2005 – July 5, 2007	OCCT/SOWT Study/Recommendation	Lead and Copper Rule	Health-based	Resolved
July 1, 2004 – February 9, 2007	Initial Tap Sampling for Pb and Cu	Lead and Copper Rule	—	Resolved
July 1, 2004 – July 31, 2004	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
October 1, 2003 – September 21, 2005	Initial Tap Sampling for Pb and Cu	Lead and Copper Rule	—	Resolved
July 1, 2002 – September 21, 2005	Initial Tap Sampling for Pb and Cu	Lead and Copper Rule	—	Resolved
October 1, 2001 – September 21, 2005	Initial Tap Sampling for Pb and Cu	Lead and Copper Rule	—	Resolved
July 1, 2001 – December 31, 2001	Water Quality Parameter M/R	Lead and Copper Rule	—	Resolved
July 1, 2001 – December 31, 2001	Water Quality Parameter M/R	Lead and Copper Rule	—	Resolved
January 1, 2001 – June 30, 2001	Water Quality Parameter M/R	Lead and Copper Rule	—	Resolved
July 1, 2000 – December 31, 2000	Water Quality Parameter M/R	Lead and Copper Rule	—	Resolved
July 1, 2000 – December 31, 2000	Water Quality Parameter M/R	Lead and Copper Rule	—	Resolved
July 1, 2000 – December 31, 2000	Water Quality Parameter M/R	Lead and Copper Rule	—	Resolved
January 1, 2000 – June 30, 2000	Water Quality Parameter M/R	Lead and Copper Rule	—	Resolved
July 1, 1999 – July 31, 1999	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	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	LASSO	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	2,3,7,8-TCDD	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	Heptachlor epoxide	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	2,4,5-TP	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	HEXACHLOROBENZENE	—	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	Total Polychlorinated Biphenyls (PCB)	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	1,2-DIBROMO-3-CHLOROPROPANE	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	Methoxychlor	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	Diquat	—	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	2,3,7,8-TCDD	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	Heptachlor	—	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
January 1, 1999 – December 31, 2001	Monitoring, Regular	Pentachlorophenol	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	Total Polychlorinated Biphenyls (PCB)	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	1,2-DIBROMO-3-CHLOROPROPANE	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	ETHYLENE DIBROMIDE	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	Beryllium, Total	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	Nickel	—	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	Benzo(a)pyrene	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	1,2,4-Trichlorobenzene	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	Xylenes, Total	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	DICHLOROMETHANE	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	p-Dichlorobenzene	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	Vinyl chloride	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	1,1-Dichloroethylene	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	1,2-Dichloroethane	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	1,1,2-Trichloroethane	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	Tetrachloroethylene	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	DICHLOROMETHANE	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	o-Dichlorobenzene	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	1,1-Dichloroethylene	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	Dalapon	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	Diquat	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	Glyphosate	—	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	Picloram	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	Aldicarb sulfoxide	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	Aldicarb sulfone	—	Resolved
August 1, 1998 – August 31, 1998	Monitoring, Repeat Major (TCR)	Coliform (TCR)	—	Resolved
January 1, 1993 – December 31, 1993	Monitoring, Regular	Nitrate	—	Resolved
August 1, 1992 – August 31, 1992	Maximum Contaminant Level Violation, Acute (TCR)	Coliform (TCR)	Health-based	Resolved

Resolved addressed and confirmed by the state

Enforcement actions

January 8, 2026State Compliance achieved1 linked violation
April 3, 2025State Violation/Reminder Notice1 linked violation
April 3, 2025State Public Notification requested1 linked violation
June 19, 2023State Violation/Reminder Notice1 linked violation
June 19, 2023State Public Notification requested1 linked violation
May 22, 2023State Compliance achieved1 linked violation
July 26, 2021State Compliance achieved1 linked violation
July 19, 2021State Violation/Reminder Notice1 linked violation
July 27, 2017State Compliance achieved1 linked violation
July 20, 2017State Violation/Reminder Notice1 linked violation
October 19, 2010State Violation/Reminder Notice1 linked violation
October 19, 2010State Public Notification requested1 linked violation
October 19, 2010State Public Notification requested1 linked violation
October 19, 2010State Violation/Reminder Notice1 linked violation
September 30, 2010State Compliance achieved2 linked violations
June 25, 2007State Violation/Reminder Notice4 linked violations
April 6, 2007State Public Notification received2 linked violations
April 2, 2007State Public Notification received2 linked violations
April 2, 2007State Public Notification received3 linked violations
April 2, 2007State Public Notification received4 linked violations
April 2, 2007State Public Notification received4 linked violations
February 9, 2007State Compliance achieved6 linked violations
January 30, 2007Federal issued Formal Notice of Violation154 linked violations
September 28, 2006State Other48 linked violations
September 28, 2006State no additional Formal Action needed71 linked violations
August 23, 2006State Public Notification received4 linked violations
October 1, 2005State Compliance achieved3 linked violations
October 1, 2005State Public Notification requested2 linked violations
September 19, 2005State Compliance achieved126 linked violations
September 16, 2005State Public Notification requested4 linked violations
September 16, 2005State Violation/Reminder Notice4 linked violations
August 13, 2005State Violation/Reminder Notice2 linked violations
August 13, 2005State Public Notification requested1 linked violation
January 3, 2005State Violation/Reminder Notice27 linked violations
January 3, 2005State Public Notification requested31 linked violations
January 3, 2005State Violation/Reminder Notice26 linked violations
January 3, 2005State Public Notification requested5 linked violations
January 3, 2005State Violation/Reminder Notice6 linked violations
January 3, 2005State Public Notification requested7 linked violations
January 3, 2005State Violation/Reminder Notice7 linked violations
January 3, 2005State Public Notification requested7 linked violations
September 17, 2004State Violation/Reminder Notice1 linked violation
September 17, 2004State Public Notification requested2 linked violations
September 17, 2004State Violation/Reminder Notice1 linked violation
September 10, 2004State Compliance achieved1 linked violation
September 3, 2004State Public Notification requested1 linked violation
September 3, 2004State Violation/Reminder Notice1 linked violation
July 1, 2004State Compliance achieved2 linked violations
June 27, 2003State Compliance achieved4 linked violations
July 27, 2002State Violation/Reminder Notice1 linked violation
July 27, 2002State Public Notification requested2 linked violations
July 27, 2002State Violation/Reminder Notice2 linked violations
July 25, 2002State Violation/Reminder Notice3 linked violations
July 25, 2002State Public Notification requested2 linked violations
July 12, 2002State Violation/Reminder Notice6 linked violations
July 12, 2002State Public Notification requested5 linked violations
July 5, 2002State Public Notification requested33 linked violations
July 5, 2002State Violation/Reminder Notice35 linked violations
June 29, 2002State Violation/Reminder Notice23 linked violations
June 29, 2002State Public Notification requested23 linked violations
May 14, 2001State Compliance achieved2 linked violations

Contact

MCKINNEY, NANCY

406-821-3753

DARBY, MT 59829