RONAN, MT · Lake County

RONAN CITY 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): MT0000318
System type: Community Water System
Population served: 2,483
Service connections: 1,004
Ownership: local government
Water source: surface water (rivers, lakes, or reservoirs)

Violation history

Monitoring of Treatment (SWTR-Filter)
—
Surface Water Treatment Rule
April 1, 2025 – April 30, 2025
Resolved
Monitoring of Treatment (SWTR-Filter)
—
Surface Water Treatment Rule
March 1, 2024 – March 31, 2024
Resolved
Monitoring, Routine (RTCR)
—
Revised Total Coliform Rule
December 1, 2023 – December 31, 2023
Resolved
Monitoring, Regular
—
Toluene
January 1, 2023 – November 30, 2023
Resolved
Monitoring, Regular
—
Benzene
January 1, 2023 – November 30, 2023
Resolved
Monitoring, Regular
—
CHLOROBENZENE
January 1, 2023 – November 30, 2023
Resolved
Monitoring, Regular
—
Tetrachloroethylene
January 1, 2023 – November 30, 2023
Resolved
Monitoring, Regular
—
1,1,2-Trichloroethane
January 1, 2023 – November 30, 2023
Resolved
Monitoring, Regular
—
Trichloroethylene
January 1, 2023 – November 30, 2023
Resolved
Monitoring, Regular
—
1,2-Dichloropropane
January 1, 2023 – November 30, 2023
Resolved
Monitoring, Regular
—
Carbon tetrachloride
January 1, 2023 – November 30, 2023
Resolved
Monitoring, Regular
—
1,1,1-Trichloroethane
January 1, 2023 – November 30, 2023
Resolved
Monitoring, Regular
—
1,2-Dichloroethane
January 1, 2023 – November 30, 2023
Resolved
Monitoring, Regular
—
trans-1,2-Dichloroethylene
January 1, 2023 – November 30, 2023
Resolved
Monitoring, Regular
—
1,1-Dichloroethylene
January 1, 2023 – November 30, 2023
Resolved
Monitoring, Regular
—
Vinyl chloride
January 1, 2023 – November 30, 2023
Resolved
Monitoring, Regular
—
p-Dichlorobenzene
January 1, 2023 – November 30, 2023
Resolved
Monitoring, Regular
—
o-Dichlorobenzene
January 1, 2023 – November 30, 2023
Resolved
Monitoring, Regular
—
DICHLOROMETHANE
January 1, 2023 – November 30, 2023
Resolved
Monitoring, Regular
—
Xylenes, Total
January 1, 2023 – November 30, 2023
Resolved
Monitoring, Regular
—
cis-1,2-Dichloroethylene
January 1, 2023 – November 30, 2023
Resolved
Monitoring, Regular
—
1,2,4-Trichlorobenzene
January 1, 2023 – November 30, 2023
Resolved
Monitoring, Regular
—
Styrene
January 1, 2023 – November 30, 2023
Resolved
Monitoring, Regular
—
Ethylbenzene
January 1, 2023 – November 30, 2023
Resolved
Monitoring, Regular
—
Heptachlor epoxide
January 1, 2014 – March 31, 2014
Resolved
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
January 1, 2014 – March 31, 2014
Resolved
Monitoring, Regular
—
Combined Radium (-226 and -228)
January 1, 2014 – March 31, 2014
Resolved
Monitoring, Regular
—
Endrin
January 1, 2014 – March 31, 2014
Resolved
Monitoring, Regular
—
BHC-GAMMA
January 1, 2014 – March 31, 2014
Resolved
Monitoring, Regular
—
Methoxychlor
January 1, 2014 – March 31, 2014
Resolved
Monitoring, Regular
—
Toxaphene
January 1, 2014 – March 31, 2014
Resolved
Monitoring, Regular
—
Dalapon
January 1, 2014 – March 31, 2014
Resolved
Monitoring, Regular
—
Di(2-ethylhexyl) adipate
January 1, 2014 – March 31, 2014
Resolved
Monitoring, Regular
—
OXAMYL
January 1, 2014 – March 31, 2014
Resolved
Monitoring, Regular
—
Simazine
January 1, 2014 – March 31, 2014
Resolved
Monitoring, Regular
—
Di(2-ethylhexyl) phthalate
January 1, 2014 – March 31, 2014
Resolved
Monitoring, Regular
—
Picloram
January 1, 2014 – March 31, 2014
Resolved
Monitoring, Regular
—
Dinoseb
January 1, 2014 – March 31, 2014
Resolved
Monitoring, Regular
—
Hexachlorocyclopentadiene
January 1, 2014 – March 31, 2014
Resolved
Monitoring, Regular
—
Aldicarb sulfoxide
January 1, 2014 – March 31, 2014
Resolved
Monitoring, Regular
—
Aldicarb sulfone
January 1, 2014 – March 31, 2014
Resolved
Monitoring, Regular
—
Carbofuran
January 1, 2014 – March 31, 2014
Resolved
Monitoring, Regular
—
Aldicarb
January 1, 2014 – March 31, 2014
Resolved
Monitoring, Regular
—
Atrazine
January 1, 2014 – March 31, 2014
Resolved
Monitoring, Regular
—
LASSO
January 1, 2014 – March 31, 2014
Resolved
Monitoring, Regular
—
2,4-D
January 1, 2014 – March 31, 2014
Resolved
Monitoring, Regular
—
2,4,5-TP
January 1, 2014 – March 31, 2014
Resolved
Monitoring, Regular
—
HEXACHLOROBENZENE
January 1, 2014 – March 31, 2014
Resolved
Monitoring, Regular
—
Benzo(a)pyrene
January 1, 2014 – March 31, 2014
Resolved
Monitoring, Regular
—
Combined Radium (-226 and -228)
July 1, 2013 – September 30, 2013
Resolved
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
July 1, 2013 – September 30, 2013
Resolved
Monitoring and Reporting (DBP)
—
TTHM
October 1, 2005 – December 31, 2005
Resolved
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
October 1, 2005 – December 31, 2005
Resolved
Monitoring, Regular
—
1,2,4-Trichlorobenzene
January 1, 2005 – December 31, 2005
Resolved
Monitoring, Regular
—
Xylenes, Total
January 1, 2005 – December 31, 2005
Resolved
Monitoring, Regular
—
cis-1,2-Dichloroethylene
January 1, 2005 – December 31, 2005
Resolved
Monitoring, Regular
—
Arsenic
January 1, 2005 – December 31, 2005
Resolved
Monitoring, Regular
—
Styrene
January 1, 2005 – December 31, 2005
Resolved
Monitoring, Regular
—
Ethylbenzene
January 1, 2005 – December 31, 2005
Resolved
Monitoring, Regular
—
Toluene
January 1, 2005 – December 31, 2005
Resolved
Monitoring, Regular
—
CHLOROBENZENE
January 1, 2005 – December 31, 2005
Resolved
Monitoring, Regular
—
Tetrachloroethylene
January 1, 2005 – December 31, 2005
Resolved
Monitoring, Regular
—
Trichloroethylene
January 1, 2005 – December 31, 2005
Resolved
Monitoring, Regular
—
1,2-Dichloropropane
January 1, 2005 – December 31, 2005
Resolved
Monitoring, Regular
—
Carbon tetrachloride
January 1, 2005 – December 31, 2005
Resolved
Monitoring, Regular
—
1,1,1-Trichloroethane
January 1, 2005 – December 31, 2005
Resolved
Monitoring, Regular
—
1,2-Dichloroethane
January 1, 2005 – December 31, 2005
Resolved
Monitoring, Regular
—
trans-1,2-Dichloroethylene
January 1, 2005 – December 31, 2005
Resolved
Monitoring, Regular
—
1,1-Dichloroethylene
January 1, 2005 – December 31, 2005
Resolved
Monitoring, Regular
—
Vinyl chloride
January 1, 2005 – December 31, 2005
Resolved
Monitoring, Regular
—
p-Dichlorobenzene
January 1, 2005 – December 31, 2005
Resolved
Monitoring, Regular
—
o-Dichlorobenzene
January 1, 2005 – December 31, 2005
Resolved
Monitoring, Regular
—
DICHLOROMETHANE
January 1, 2005 – December 31, 2005
Resolved
Monitoring, Regular
—
Arsenic
January 1, 2002 – December 31, 2002
Resolved
Monitoring, Regular
—
Asbestos
January 1, 2002 – December 31, 2010
Archived
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
January 1, 1997 – January 31, 1997
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
April 1, 2025 – April 30, 2025	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	—	Resolved
March 1, 2024 – March 31, 2024	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	—	Resolved
December 1, 2023 – December 31, 2023	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	—	Resolved
January 1, 2023 – November 30, 2023	Monitoring, Regular	Toluene	—	Resolved
January 1, 2023 – November 30, 2023	Monitoring, Regular	Benzene	—	Resolved
January 1, 2023 – November 30, 2023	Monitoring, Regular	CHLOROBENZENE	—	Resolved
January 1, 2023 – November 30, 2023	Monitoring, Regular	Tetrachloroethylene	—	Resolved
January 1, 2023 – November 30, 2023	Monitoring, Regular	1,1,2-Trichloroethane	—	Resolved
January 1, 2023 – November 30, 2023	Monitoring, Regular	Trichloroethylene	—	Resolved
January 1, 2023 – November 30, 2023	Monitoring, Regular	1,2-Dichloropropane	—	Resolved
January 1, 2023 – November 30, 2023	Monitoring, Regular	Carbon tetrachloride	—	Resolved
January 1, 2023 – November 30, 2023	Monitoring, Regular	1,1,1-Trichloroethane	—	Resolved
January 1, 2023 – November 30, 2023	Monitoring, Regular	1,2-Dichloroethane	—	Resolved
January 1, 2023 – November 30, 2023	Monitoring, Regular	trans-1,2-Dichloroethylene	—	Resolved
January 1, 2023 – November 30, 2023	Monitoring, Regular	1,1-Dichloroethylene	—	Resolved
January 1, 2023 – November 30, 2023	Monitoring, Regular	Vinyl chloride	—	Resolved
January 1, 2023 – November 30, 2023	Monitoring, Regular	p-Dichlorobenzene	—	Resolved
January 1, 2023 – November 30, 2023	Monitoring, Regular	o-Dichlorobenzene	—	Resolved
January 1, 2023 – November 30, 2023	Monitoring, Regular	DICHLOROMETHANE	—	Resolved
January 1, 2023 – November 30, 2023	Monitoring, Regular	Xylenes, Total	—	Resolved
January 1, 2023 – November 30, 2023	Monitoring, Regular	cis-1,2-Dichloroethylene	—	Resolved
January 1, 2023 – November 30, 2023	Monitoring, Regular	1,2,4-Trichlorobenzene	—	Resolved
January 1, 2023 – November 30, 2023	Monitoring, Regular	Styrene	—	Resolved
January 1, 2023 – November 30, 2023	Monitoring, Regular	Ethylbenzene	—	Resolved
January 1, 2014 – March 31, 2014	Monitoring, Regular	Heptachlor epoxide	—	Resolved
January 1, 2014 – March 31, 2014	Monitoring, Regular	Gross Alpha, Excl. Radon and U	—	Resolved
January 1, 2014 – March 31, 2014	Monitoring, Regular	Combined Radium (-226 and -228)	—	Resolved
January 1, 2014 – March 31, 2014	Monitoring, Regular	Endrin	—	Resolved
January 1, 2014 – March 31, 2014	Monitoring, Regular	BHC-GAMMA	—	Resolved
January 1, 2014 – March 31, 2014	Monitoring, Regular	Methoxychlor	—	Resolved
January 1, 2014 – March 31, 2014	Monitoring, Regular	Toxaphene	—	Resolved
January 1, 2014 – March 31, 2014	Monitoring, Regular	Dalapon	—	Resolved
January 1, 2014 – March 31, 2014	Monitoring, Regular	Di(2-ethylhexyl) adipate	—	Resolved
January 1, 2014 – March 31, 2014	Monitoring, Regular	OXAMYL	—	Resolved
January 1, 2014 – March 31, 2014	Monitoring, Regular	Simazine	—	Resolved
January 1, 2014 – March 31, 2014	Monitoring, Regular	Di(2-ethylhexyl) phthalate	—	Resolved
January 1, 2014 – March 31, 2014	Monitoring, Regular	Picloram	—	Resolved
January 1, 2014 – March 31, 2014	Monitoring, Regular	Dinoseb	—	Resolved
January 1, 2014 – March 31, 2014	Monitoring, Regular	Hexachlorocyclopentadiene	—	Resolved
January 1, 2014 – March 31, 2014	Monitoring, Regular	Aldicarb sulfoxide	—	Resolved
January 1, 2014 – March 31, 2014	Monitoring, Regular	Aldicarb sulfone	—	Resolved
January 1, 2014 – March 31, 2014	Monitoring, Regular	Carbofuran	—	Resolved
January 1, 2014 – March 31, 2014	Monitoring, Regular	Aldicarb	—	Resolved
January 1, 2014 – March 31, 2014	Monitoring, Regular	Atrazine	—	Resolved
January 1, 2014 – March 31, 2014	Monitoring, Regular	LASSO	—	Resolved
January 1, 2014 – March 31, 2014	Monitoring, Regular	2,4-D	—	Resolved
January 1, 2014 – March 31, 2014	Monitoring, Regular	2,4,5-TP	—	Resolved
January 1, 2014 – March 31, 2014	Monitoring, Regular	HEXACHLOROBENZENE	—	Resolved
January 1, 2014 – March 31, 2014	Monitoring, Regular	Benzo(a)pyrene	—	Resolved
July 1, 2013 – September 30, 2013	Monitoring, Regular	Combined Radium (-226 and -228)	—	Resolved
July 1, 2013 – September 30, 2013	Monitoring, Regular	Gross Alpha, Excl. Radon and U	—	Resolved
October 1, 2005 – December 31, 2005	Monitoring and Reporting (DBP)	TTHM	—	Resolved
October 1, 2005 – December 31, 2005	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	Resolved
January 1, 2005 – December 31, 2005	Monitoring, Regular	1,2,4-Trichlorobenzene	—	Resolved
January 1, 2005 – December 31, 2005	Monitoring, Regular	Xylenes, Total	—	Resolved
January 1, 2005 – December 31, 2005	Monitoring, Regular	cis-1,2-Dichloroethylene	—	Resolved
January 1, 2005 – December 31, 2005	Monitoring, Regular	Arsenic	—	Resolved
January 1, 2005 – December 31, 2005	Monitoring, Regular	Styrene	—	Resolved
January 1, 2005 – December 31, 2005	Monitoring, Regular	Ethylbenzene	—	Resolved
January 1, 2005 – December 31, 2005	Monitoring, Regular	Toluene	—	Resolved
January 1, 2005 – December 31, 2005	Monitoring, Regular	CHLOROBENZENE	—	Resolved
January 1, 2005 – December 31, 2005	Monitoring, Regular	Tetrachloroethylene	—	Resolved
January 1, 2005 – December 31, 2005	Monitoring, Regular	Trichloroethylene	—	Resolved
January 1, 2005 – December 31, 2005	Monitoring, Regular	1,2-Dichloropropane	—	Resolved
January 1, 2005 – December 31, 2005	Monitoring, Regular	Carbon tetrachloride	—	Resolved
January 1, 2005 – December 31, 2005	Monitoring, Regular	1,1,1-Trichloroethane	—	Resolved
January 1, 2005 – December 31, 2005	Monitoring, Regular	1,2-Dichloroethane	—	Resolved
January 1, 2005 – December 31, 2005	Monitoring, Regular	trans-1,2-Dichloroethylene	—	Resolved
January 1, 2005 – December 31, 2005	Monitoring, Regular	1,1-Dichloroethylene	—	Resolved
January 1, 2005 – December 31, 2005	Monitoring, Regular	Vinyl chloride	—	Resolved
January 1, 2005 – December 31, 2005	Monitoring, Regular	p-Dichlorobenzene	—	Resolved
January 1, 2005 – December 31, 2005	Monitoring, Regular	o-Dichlorobenzene	—	Resolved
January 1, 2005 – December 31, 2005	Monitoring, Regular	DICHLOROMETHANE	—	Resolved
January 1, 2002 – December 31, 2002	Monitoring, Regular	Arsenic	—	Resolved
January 1, 2002 – December 31, 2010	Monitoring, Regular	Asbestos	—	Archived
January 1, 1997 – January 31, 1997	Monitoring, Routine Minor (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

June 5, 2025State Public Notification requested1 linked violation
June 5, 2025State Violation/Reminder Notice1 linked violation
June 5, 2025State Compliance achieved1 linked violation
June 5, 2025State Public Notification requested1 linked violation
June 5, 2025State Violation/Reminder Notice1 linked violation
June 5, 2025State Compliance achieved1 linked violation
January 31, 2024State Violation/Reminder Notice21 linked violations
January 31, 2024State Public Notification requested21 linked violations
January 30, 2024State Compliance achieved1 linked violation
January 23, 2024State Violation/Reminder Notice1 linked violation
January 23, 2024State Public Notification requested1 linked violation
November 30, 2023State Compliance achieved21 linked violations
March 25, 2020State no additional Formal Action needed1 linked violation
November 8, 2018State Compliance achieved1 linked violation
April 22, 2014State Compliance achieved1 linked violation
April 22, 2014State Compliance achieved1 linked violation
April 22, 2014State Compliance achieved26 linked violations
April 16, 2014State Public Notification requested1 linked violation
April 16, 2014State Public Notification requested26 linked violations
April 16, 2014State Violation/Reminder Notice26 linked violations
April 16, 2014State Public Notification requested1 linked violation
April 16, 2014State Violation/Reminder Notice1 linked violation
April 16, 2014State Violation/Reminder Notice1 linked violation
October 15, 2013State Public Notification requested1 linked violation
October 15, 2013State Violation/Reminder Notice1 linked violation
October 15, 2013State Public Notification requested1 linked violation
October 15, 2013State Violation/Reminder Notice1 linked violation
October 15, 2013State Compliance achieved2 linked violations
October 15, 2013State Violation/Reminder Notice1 linked violation
October 15, 2013State Public Notification requested1 linked violation
October 15, 2013State Violation/Reminder Notice1 linked violation
October 15, 2013State Public Notification requested1 linked violation
March 22, 2013State Consent Decree/Judgement1 linked violation
August 27, 2012State Compliance achieved1 linked violation
August 15, 2012State Public Notification requested1 linked violation
August 15, 2012State Violation/Reminder Notice1 linked violation
May 18, 2012State Case appealed1 linked violation
May 2, 2012State Administrative/Compliance Order without penalty issued1 linked violation
January 3, 2012State Public Notification requested1 linked violation
January 3, 2012State Violation/Reminder Notice1 linked violation
January 3, 2012State Public Notification received1 linked violation
January 3, 2012State Other1 linked violation
May 29, 2009State Compliance achievedgeneral compliance action — not tied to a specific violation on record
May 15, 2009State Compliance achieved1 linked violation
July 28, 2008State Compliance achieved2 linked violations
January 18, 2007State Compliance achieved21 linked violations
February 25, 2006State Public Notification requested2 linked violations
February 25, 2006State Violation/Reminder Notice2 linked violations
February 14, 2006State Compliance achieved1 linked violation
February 10, 2006State Violation/Reminder Notice21 linked violations
February 10, 2006State Public Notification requested21 linked violations
February 9, 2006State Violation/Reminder Notice1 linked violation
February 9, 2006State Public Notification requested1 linked violation
April 13, 2005State Public Notification requested2 linked violations
April 13, 2005State Violation/Reminder Notice1 linked violation
April 6, 2005State Compliance achieved1 linked violation
May 15, 2001State Compliance achieved1 linked violation

Contact

CITY OF RONAN

406-676-4231

RONAN, MT 59864