BIG SKY, MT · Madison County

BIG SKY COUNTY WATER AND SEWER DIST 363 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): MT0002385
System type: Community Water System
Population served: 4,132
Service connections: 2,599
Ownership: local government
Water source: groundwater (wells)

Violation history

Monitoring, Regular
—
Nitrate-Nitrite
April 1, 2025 – June 30, 2025
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2020 – August 3, 2020
Resolved
Monitoring, Regular
—
Asbestos
January 1, 2020 – December 31, 2022
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2014 – August 8, 2014
Resolved
Lead Consumer Notice
—
Lead and Copper Rule
January 1, 2014 – March 26, 2014
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
January 1, 2012 – January 31, 2012
Resolved
Monitoring, Regular
—
Nitrate-Nitrite
January 1, 2012 – November 20, 2012
Resolved
Monitoring, Regular
—
Asbestos
January 1, 2011 – December 31, 2013
Resolved
Monitoring, Regular
—
Nitrate-Nitrite
January 1, 2009 – December 31, 2009
Resolved
Monitoring, Regular
—
Nitrate-Nitrite
January 1, 2009 – December 31, 2009
Resolved
Monitoring, Regular
—
Nitrate-Nitrite
January 1, 2009 – December 31, 2009
Resolved
Monitoring, Regular
—
Nitrate-Nitrite
January 1, 2009 – December 31, 2009
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
September 1, 2008 – September 30, 2008
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
August 1, 2008 – August 31, 2008
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
July 1, 2008 – July 31, 2008
Resolved
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
January 1, 2008 – December 31, 2016
Archived
Monitoring, Regular
—
Combined Radium (-226 and -228)
January 1, 2008 – December 31, 2016
Archived
Monitoring, Regular
—
Combined Radium (-226 and -228)
January 1, 2008 – December 31, 2016
Archived
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
October 1, 2005 – October 31, 2005
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
August 1, 2005 – August 31, 2005
Resolved
Monitoring, Repeat Minor (TCR)
—
Coliform (TCR)
July 1, 2005 – July 31, 2005
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
October 1, 2003 – October 31, 2003
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
February 1, 1999 – February 28, 1999
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
April 1, 1997 – April 30, 1997
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
August 1, 1996 – August 31, 1996
Resolved
Monitoring, Regular
—
Nitrate
January 1, 1994 – December 31, 1994
Resolved
Monitoring, Repeat Major (TCR)
—
Coliform (TCR)
August 1, 1992 – August 31, 1992
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 – June 30, 2025	Monitoring, Regular	Nitrate-Nitrite	—	Resolved
July 1, 2020 – August 3, 2020	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
January 1, 2020 – December 31, 2022	Monitoring, Regular	Asbestos	—	Resolved
July 1, 2014 – August 8, 2014	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
January 1, 2014 – March 26, 2014	Lead Consumer Notice	Lead and Copper Rule	—	Resolved
January 1, 2012 – January 31, 2012	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
January 1, 2012 – November 20, 2012	Monitoring, Regular	Nitrate-Nitrite	—	Resolved
January 1, 2011 – December 31, 2013	Monitoring, Regular	Asbestos	—	Resolved
January 1, 2009 – December 31, 2009	Monitoring, Regular	Nitrate-Nitrite	—	Resolved
January 1, 2009 – December 31, 2009	Monitoring, Regular	Nitrate-Nitrite	—	Resolved
January 1, 2009 – December 31, 2009	Monitoring, Regular	Nitrate-Nitrite	—	Resolved
January 1, 2009 – December 31, 2009	Monitoring, Regular	Nitrate-Nitrite	—	Resolved
September 1, 2008 – September 30, 2008	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
August 1, 2008 – August 31, 2008	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Resolved
July 1, 2008 – July 31, 2008	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Resolved
January 1, 2008 – December 31, 2016	Monitoring, Regular	Gross Alpha, Excl. Radon and U	—	Archived
January 1, 2008 – December 31, 2016	Monitoring, Regular	Combined Radium (-226 and -228)	—	Archived
January 1, 2008 – December 31, 2016	Monitoring, Regular	Combined Radium (-226 and -228)	—	Archived
October 1, 2005 – October 31, 2005	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
August 1, 2005 – August 31, 2005	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
July 1, 2005 – July 31, 2005	Monitoring, Repeat Minor (TCR)	Coliform (TCR)	—	Resolved
October 1, 2003 – October 31, 2003	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
February 1, 1999 – February 28, 1999	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
April 1, 1997 – April 30, 1997	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
August 1, 1996 – August 31, 1996	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
January 1, 1994 – December 31, 1994	Monitoring, Regular	Nitrate	—	Resolved
August 1, 1992 – August 31, 1992	Monitoring, Repeat 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

July 23, 2025State Violation/Reminder Notice1 linked violation
July 23, 2025State Public Notification requested1 linked violation
July 7, 2025State Compliance achieved1 linked violation
October 28, 2024State Compliance achieved1 linked violation
January 24, 2023State Violation/Reminder Notice1 linked violation
January 24, 2023State Public Notification requested1 linked violation
August 3, 2020State Compliance achieved1 linked violation
July 20, 2020State Violation/Reminder Notice1 linked violation
August 8, 2014State Compliance achieved1 linked violation
July 14, 2014State Violation/Reminder Notice1 linked violation
May 28, 2014State Compliance achieved1 linked violation
March 26, 2014State Compliance achieved1 linked violation
January 24, 2014State Public Notification requested1 linked violation
January 24, 2014State Violation/Reminder Notice1 linked violation
January 23, 2014State Violation/Reminder Notice1 linked violation
January 18, 2013State Violation/Reminder Notice1 linked violation
January 18, 2013State Public Notification requested1 linked violation
November 20, 2012State Compliance achieved1 linked violation
February 6, 2012State Compliance achieved1 linked violation
January 17, 2012State Violation/Reminder Notice1 linked violation
January 17, 2012State Public Notification requested1 linked violation
January 17, 2012State Violation/Reminder Notice1 linked violation
January 27, 2010State Compliance achieved4 linked violations
January 13, 2010State Violation/Reminder Notice1 linked violation
January 13, 2010State Violation/Reminder Notice1 linked violation
January 13, 2010State Public Notification requested1 linked violation
January 13, 2010State Public Notification requested1 linked violation
January 13, 2010State Violation/Reminder Notice1 linked violation
January 13, 2010State Public Notification requested1 linked violation
January 13, 2010State Violation/Reminder Notice1 linked violation
January 13, 2010State Public Notification requested1 linked violation
May 29, 2009State Compliance achieved13 linked violations
May 29, 2009State Compliance achieved1 linked violation
May 15, 2009State Compliance achieved4 linked violations
September 29, 2008State Public Notification received1 linked violation
September 26, 2008State Violation/Reminder Notice1 linked violation
September 26, 2008State Public Notification requested1 linked violation
September 26, 2008State Violation/Reminder Notice1 linked violation
September 17, 2008State Public Notification requested1 linked violation
September 17, 2008State Violation/Reminder Notice1 linked violation
August 15, 2008State Compliance achieved1 linked violation
August 15, 2008State Public Notification requested1 linked violation
August 15, 2008State Violation/Reminder Notice1 linked violation
August 15, 2008State Public Notification received1 linked violation
March 20, 2008State Compliance achieved3 linked violations
December 25, 2005State Public Notification requested2 linked violations
December 25, 2005State Violation/Reminder Notice1 linked violation
September 17, 2005State Violation/Reminder Notice3 linked violations
August 25, 2005State Public Notification requested2 linked violations
October 16, 2003State Violation/Reminder Notice1 linked violation
October 16, 2003State Compliance achieved3 linked violations
October 16, 2003State Public Notification requested3 linked violations
April 3, 1999State Public Notification requested1 linked violation
April 3, 1999State Violation/Reminder Notice1 linked violation
March 4, 1999State Public Notification requested1 linked violation
March 4, 1999State Violation/Reminder Notice1 linked violation
December 3, 1996State Formal Notice of Violation issued1 linked violation

Contact

SAND, AMY

406-995-2660

BIG SKY, MT 59716-0670