HELENA, MT · Cascade County

RYAN DAM WATER SYSTEM 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): MT0000046
System type: Community Water System
Population served: 230
Service connections: 14
Ownership: privately owned
Water source: groundwater (wells)

Violation history

Treatment Technique, Level 1 Assessment (RTCR)
Health-based
Revised Total Coliform Rule
May 24, 2023 – June 5, 2023
Resolved
Monitoring, Source Water (GWR)
—
E. COLI
April 20, 2023 – April 25, 2023
Resolved
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
January 1, 2023 – December 31, 2025
Archived
Monitoring and Reporting (DBP)
—
TTHM
January 1, 2023 – December 31, 2025
Archived
Monitoring of Treatment (SWTR-Unfilt/GWR)
—
Groundwater Rule
July 1, 2019 – July 31, 2019
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2019 – July 19, 2019
Resolved
Monitoring of Treatment (SWTR-Unfilt/GWR)
—
Groundwater Rule
July 1, 2018 – July 31, 2018
Resolved
Lead Consumer Notice
—
Lead and Copper Rule
October 1, 2012 – October 15, 2012
Resolved
Water Quality Parameter M/R
—
Lead and Copper Rule
January 1, 2011 – February 28, 2011
Resolved
Monitoring, Regular
—
Asbestos
January 1, 2011 – July 24, 2013
Resolved
Water Quality Parameter M/R
—
Lead and Copper Rule
January 1, 2011 – February 28, 2011
Resolved
Monitoring, Repeat Major (TCR)
—
Coliform (TCR)
December 1, 2008 – December 31, 2008
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
July 1, 2008 – July 31, 2008
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2008 – August 15, 2008
Resolved
Monitoring, Regular
—
Combined Radium (-226 and -228)
January 1, 2008 – December 31, 2016
Resolved
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
January 1, 2008 – December 31, 2016
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
October 1, 2007 – October 31, 2007
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
September 1, 2006 – September 30, 2006
Resolved
Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
October 1, 2004 – June 19, 2002
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
September 1, 2004 – September 30, 2004
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
July 1, 2004 – July 31, 2004
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
August 1, 2002 – August 31, 2002
Resolved
Monitoring, Regular
—
Nitrate-Nitrite
January 1, 2000 – December 31, 2000
Resolved
Monitoring, Regular
—
ETHYLENE DIBROMIDE
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
Total Polychlorinated Biphenyls (PCB)
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
Pentachlorophenol
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
HEXACHLOROBENZENE
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
2,4,5-TP
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
2,4-D
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
Heptachlor epoxide
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
2,3,7,8-TCDD
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
Aldicarb
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
Di(2-ethylhexyl) phthalate
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
OXAMYL
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
Glyphosate
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
Endothall
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
Dalapon
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
Toxaphene
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
Methoxychlor
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
BHC-GAMMA
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
Dinoseb
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Regular
—
Chlordane
January 1, 1999 – December 31, 2001
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
April 1, 1997 – April 30, 1997
Resolved
Monitoring, Repeat Major (TCR)
—
Coliform (TCR)
October 1, 1995 – October 31, 1995
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
March 1, 1995 – March 31, 1995
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
May 24, 2023 – June 5, 2023	Treatment Technique, Level 1 Assessment (RTCR)	Revised Total Coliform Rule	Health-based	Resolved
April 20, 2023 – April 25, 2023	Monitoring, Source Water (GWR)	E. COLI	—	Resolved
January 1, 2023 – December 31, 2025	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	Archived
January 1, 2023 – December 31, 2025	Monitoring and Reporting (DBP)	TTHM	—	Archived
July 1, 2019 – July 31, 2019	Monitoring of Treatment (SWTR-Unfilt/GWR)	Groundwater Rule	—	Resolved
July 1, 2019 – July 19, 2019	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
July 1, 2018 – July 31, 2018	Monitoring of Treatment (SWTR-Unfilt/GWR)	Groundwater Rule	—	Resolved
October 1, 2012 – October 15, 2012	Lead Consumer Notice	Lead and Copper Rule	—	Resolved
January 1, 2011 – February 28, 2011	Water Quality Parameter M/R	Lead and Copper Rule	—	Resolved
January 1, 2011 – July 24, 2013	Monitoring, Regular	Asbestos	—	Resolved
January 1, 2011 – February 28, 2011	Water Quality Parameter M/R	Lead and Copper Rule	—	Resolved
December 1, 2008 – December 31, 2008	Monitoring, Repeat Major (TCR)	Coliform (TCR)	—	Resolved
July 1, 2008 – July 31, 2008	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
July 1, 2008 – August 15, 2008	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
January 1, 2008 – December 31, 2016	Monitoring, Regular	Combined Radium (-226 and -228)	—	Resolved
January 1, 2008 – December 31, 2016	Monitoring, Regular	Gross Alpha, Excl. Radon and U	—	Resolved
October 1, 2007 – October 31, 2007	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
September 1, 2006 – September 30, 2006	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
October 1, 2004 – June 19, 2002	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Resolved
September 1, 2004 – September 30, 2004	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
July 1, 2004 – July 31, 2004	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
August 1, 2002 – August 31, 2002	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
January 1, 2000 – December 31, 2000	Monitoring, Regular	Nitrate-Nitrite	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	ETHYLENE DIBROMIDE	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	Total Polychlorinated Biphenyls (PCB)	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	Pentachlorophenol	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	HEXACHLOROBENZENE	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	2,4,5-TP	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	2,4-D	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	Heptachlor epoxide	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	2,3,7,8-TCDD	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	Aldicarb	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	Di(2-ethylhexyl) phthalate	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	OXAMYL	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	Glyphosate	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	Endothall	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	Dalapon	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	Toxaphene	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	Methoxychlor	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	BHC-GAMMA	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	Dinoseb	—	Resolved
January 1, 1999 – December 31, 2001	Monitoring, Regular	Chlordane	—	Resolved
April 1, 1997 – April 30, 1997	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
October 1, 1995 – October 31, 1995	Monitoring, Repeat Major (TCR)	Coliform (TCR)	—	Resolved
March 1, 1995 – March 31, 1995	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

November 5, 2025State Public Notification received2 linked violations
October 22, 2025State Violation/Reminder Notice2 linked violations
October 22, 2025State Public Notification requested2 linked violations
June 19, 2023State Public Notification requested1 linked violation
June 19, 2023State Violation/Reminder Notice1 linked violation
June 19, 2023State Public Notification received1 linked violation
June 8, 2023State Public Notification requested1 linked violation
June 8, 2023State Violation/Reminder Notice1 linked violation
June 5, 2023State Compliance achieved1 linked violation
April 25, 2023State Compliance achieved1 linked violation
September 24, 2019State Public Notification received1 linked violation
September 4, 2019State Compliance achieved1 linked violation
August 20, 2019State Public Notification requested1 linked violation
August 20, 2019State Violation/Reminder Notice1 linked violation
July 19, 2019State Compliance achieved1 linked violation
July 17, 2019State Violation/Reminder Notice1 linked violation
September 5, 2018State Compliance achieved1 linked violation
August 28, 2018State Public Notification received1 linked violation
August 16, 2018State Public Notification requested1 linked violation
August 16, 2018State Violation/Reminder Notice1 linked violation
February 15, 2017State Compliance achieved1 linked violation
February 15, 2017State Compliance achieved1 linked violation
February 2, 2017State Public Notification requested1 linked violation
February 2, 2017State Public Notification requested1 linked violation
February 2, 2017State Violation/Reminder Notice1 linked violation
February 2, 2017State Violation/Reminder Notice1 linked violation
January 24, 2014State Public Notification requested1 linked violation
January 24, 2014State Violation/Reminder Notice1 linked violation
July 24, 2013State Compliance achieved1 linked violation
October 15, 2012State Compliance achieved1 linked violation
October 5, 2012State Violation/Reminder Notice1 linked violation
February 28, 2011State Compliance achieved2 linked violations
February 23, 2011State Public Notification received2 linked violations
February 11, 2011State Violation/Reminder Notice2 linked violations
September 25, 2009State Compliance achieved11 linked violations
May 15, 2009State Compliance achieved1 linked violation
May 15, 2009State Compliance achieved2 linked violations
May 15, 2009State Compliance achieved1 linked violation
May 15, 2009State Compliance achieved1 linked violation
May 15, 2009State Compliance achieved1 linked violation
January 22, 2009State Public Notification requested2 linked violations
August 17, 2008State Violation/Reminder Notice2 linked violations
August 15, 2008State Compliance achieved2 linked violations
July 3, 2008State Public Notification requested2 linked violations
July 3, 2008State Violation/Reminder Notice3 linked violations
June 4, 2008State Compliance achieved2 linked violations
January 14, 2008State Public Notification received1 linked violation
October 14, 2007State Violation/Reminder Notice2 linked violations
October 12, 2006State Public Notification received5 linked violations
October 3, 2006State Public Notification requested6 linked violations
October 3, 2006State Violation/Reminder Notice4 linked violations
January 4, 2005State Violation/Reminder Notice8 linked violations
January 4, 2005State Public Notification requested7 linked violations
September 10, 2004State Compliance achieved2 linked violations
September 3, 2004State Public Notification requested1 linked violation
September 3, 2004State Violation/Reminder Notice1 linked violation
September 24, 2001State Public Notification requested1 linked violation
September 24, 2001State Violation/Reminder Notice1 linked violation
April 30, 2001State Compliance achieved1 linked violation
May 29, 1997State Violation/Reminder Notice1 linked violation

Contact

TOLLEFSON, JORDAN

406-443-8907

HELENA, MT 59620-0901