GREAT FALLS, MT · Cascade County

OASIS WATER SERVICE Water System

Inactive system

This water system is marked inactive in EPA’s federal records as of December 29, 2015. It is no longer an operating public water system under this PWSID, and no compliance deadlines — including the 2027 Consumer Confidence Report rule — apply to it.

If you are a resident looking for your current water provider, see water systems in Cascade County, MT.

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): MT0003946
System type: Community Water System
Population served: 45
Service connections: 1
Ownership: privately owned
Water source: surface water (rivers, lakes, or reservoirs)

Violation history

Monitoring, Routine Major (TCR)
—
Coliform (TCR)
November 1, 2015 – November 30, 2015
Resolved
Consumer Confidence Report Inadequate Reporting
—
Consumer Confidence Rule
October 1, 2015 – December 11, 2015
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2015 – December 29, 2015
Archived
Consumer Confidence Report Inadequate Reporting
—
Consumer Confidence Rule
October 1, 2014 – January 29, 2015
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2014 – January 29, 2015
Resolved
Lead Consumer Notice
—
Lead and Copper Rule
January 1, 2014 – December 29, 2015
Archived
Consumer Confidence Report Inadequate Reporting
—
Consumer Confidence Rule
October 1, 2013 – January 28, 2014
Resolved
Lead Consumer Notice
—
Lead and Copper Rule
January 1, 2011 – May 12, 2011
Resolved
Initial Tap Sampling for Pb and Cu
—
Lead and Copper Rule
July 1, 2005 – August 29, 2007
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
October 1, 1999 – October 31, 1999
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
October 1, 1998 – October 31, 1998
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
August 1, 1998 – August 31, 1998
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
November 1, 2015 – November 30, 2015	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
October 1, 2015 – December 11, 2015	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	—	Resolved
July 1, 2015 – December 29, 2015	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Archived
October 1, 2014 – January 29, 2015	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	—	Resolved
July 1, 2014 – January 29, 2015	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
January 1, 2014 – December 29, 2015	Lead Consumer Notice	Lead and Copper Rule	—	Archived
October 1, 2013 – January 28, 2014	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	—	Resolved
January 1, 2011 – May 12, 2011	Lead Consumer Notice	Lead and Copper Rule	—	Resolved
July 1, 2005 – August 29, 2007	Initial Tap Sampling for Pb and Cu	Lead and Copper Rule	—	Resolved
October 1, 1999 – October 31, 1999	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
October 1, 1998 – October 31, 1998	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
August 1, 1998 – August 31, 1998	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

December 14, 2015State Public Notification requested9 linked violations
December 14, 2015State Violation/Reminder Notice1 linked violation
December 11, 2015State Compliance achieved2 linked violations
July 15, 2015State Violation/Reminder Notice1 linked violation
January 29, 2015State Compliance achieved1 linked violation
January 29, 2015State Compliance achieved1 linked violation
October 27, 2014State Violation/Reminder Notice1 linked violation
July 14, 2014State Violation/Reminder Notice1 linked violation
January 28, 2014State Compliance achieved1 linked violation
January 28, 2014State Compliance achieved1 linked violation
January 23, 2014State Violation/Reminder Notice1 linked violation
December 20, 2013State Violation/Reminder Notice1 linked violation
July 16, 2013State Violation/Reminder Notice1 linked violation
January 24, 2013State Compliance achieved1 linked violation
November 14, 2012State Violation/Reminder Notice1 linked violation
May 12, 2011State Compliance achieved1 linked violation
February 15, 2011State Violation/Reminder Notice2 linked violations
August 29, 2007State Compliance achieved14 linked violations
August 24, 2007State Administrative/Compliance Order with penalty issued14 linked violations
August 15, 2007State Violation/Reminder Notice9 linked violations
February 13, 2007State Violation/Reminder Notice4 linked violations
February 13, 2007State Public Notification requested4 linked violations
February 12, 2007State Other11 linked violations
June 26, 2002State Compliance achieved1 linked violation
June 20, 2002State Violation/Reminder Notice1 linked violation
June 20, 2002State Public Notification requested1 linked violation
December 16, 2001State Public Notification requested1 linked violation

Last known contact on file (system is inactive)

CAMPBELL, JASON

406-727-2800

GREAT FALLS, MT 59403