ENTERPRISE, OR · Wasco County

MOSIER, CITY OF Water System

Current status

1 item on record is open and awaiting resolution as of July 4, 2026. None are health-based violations — open items of this kind are most often monitoring or reporting requirements, not water-safety findings. Full details are in the violation history below.

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 Oregon’s official records. Always confirm current status with Oregon before making decisions based on this information.

System facts

System ID (PWSID): OR4100543
System type: Community Water System
Population served: 468
Service connections: 217
Ownership: local government
Water source: groundwater (wells)

Violation history

Monitoring, Routine (RTCR)
—
Revised Total Coliform Rule
December 1, 2025 – December 31, 2025
Archived
Monitoring, Routine (RTCR)
—
Revised Total Coliform Rule
March 1, 2025 – March 31, 2025
Resolved
Monitoring, Routine (RTCR)
—
Revised Total Coliform Rule
February 1, 2025 – February 28, 2025
Resolved
Monitoring, Routine (RTCR)
—
Revised Total Coliform Rule
January 1, 2025 – January 31, 2025
Resolved
Monitoring, Routine (RTCR)
—
Revised Total Coliform Rule
December 1, 2024 – December 31, 2024
Resolved
Monitoring, Routine (RTCR)
—
Revised Total Coliform Rule
November 1, 2024 – November 30, 2024
Resolved
Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
October 1, 2024
Unaddressed
Monitoring, Routine (RTCR)
—
Revised Total Coliform Rule
October 1, 2024 – October 31, 2024
Resolved
Monitoring, Routine (RTCR)
—
Revised Total Coliform Rule
September 1, 2024 – September 30, 2024
Resolved
Monitoring, Routine (RTCR)
—
Revised Total Coliform Rule
August 1, 2024 – August 31, 2024
Resolved
Monitoring, Routine (RTCR)
—
Revised Total Coliform Rule
July 1, 2024 – July 31, 2024
Resolved
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
January 1, 2022 – December 31, 2024
Resolved
Monitoring and Reporting (DBP)
—
TTHM
January 1, 2022 – December 31, 2024
Resolved
Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
October 1, 2020 – August 26, 2021
Resolved
Monitoring, Routine (RTCR)
—
Revised Total Coliform Rule
August 1, 2020 – August 31, 2020
Resolved
Failure to Conduct Assessment Monitoring
—
COLIPHAGE
January 1, 2018 – December 31, 2018
Resolved
Monitoring, Regular
—
Nitrate
January 1, 2018 – December 31, 2018
Resolved
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
October 1, 2017 – September 30, 2020
Resolved
Monitoring and Reporting (DBP)
—
TTHM
October 1, 2017 – September 30, 2020
Resolved
Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
January 1, 2017 – October 6, 2017
Resolved
Monitoring, Routine (RTCR)
—
Revised Total Coliform Rule
December 1, 2016 – December 31, 2016
Resolved
Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
January 1, 2014 – February 12, 2014
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
July 1, 2012 – July 31, 2012
Resolved
Failure to Conduct Assessment Monitoring
—
COLIPHAGE
January 1, 2012 – December 31, 2012
Resolved
Monitoring and Reporting (DBP)
—
TTHM
January 1, 2009 – January 31, 2009
Resolved
Monitoring, Regular
—
Nitrate
January 1, 2009 – December 31, 2009
Resolved
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
January 1, 2008 – December 31, 2008
Resolved
Monitoring and Reporting (DBP)
—
TTHM
January 1, 2008 – December 31, 2008
Resolved
Monitoring, Regular
—
Benzene
January 1, 2005 – December 31, 2007
Resolved
Monitoring, Regular
—
o-Dichlorobenzene
January 1, 2005 – December 31, 2007
Resolved
Monitoring, Regular
—
Vinyl chloride
January 1, 2005 – December 31, 2007
Resolved
Monitoring, Regular
—
trans-1,2-Dichloroethylene
January 1, 2005 – December 31, 2007
Resolved
Monitoring, Regular
—
1,2-Dichloroethane
January 1, 2005 – December 31, 2007
Resolved
Monitoring, Regular
—
Tetrachloroethylene
January 1, 2005 – December 31, 2007
Resolved
Monitoring, Repeat Major (TCR)
—
Coliform (TCR)
June 1, 2002 – June 30, 2002
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
February 1, 2000 – February 29, 2000
Resolved
Monitoring, Repeat Major (TCR)
—
Coliform (TCR)
August 1, 1999 – August 31, 1999
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
August 1, 1999 – August 31, 1999
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
July 1, 1999 – July 31, 1999
Resolved
Monitoring, Repeat Major (TCR)
—
Coliform (TCR)
April 1, 1999 – April 30, 1999
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
September 1, 1996 – September 30, 1996
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
July 1, 1996 – July 31, 1996
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
August 1, 1994 – August 31, 1994
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
July 1, 1994 – July 31, 1994
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
July 1, 1993 – July 31, 1993
Resolved
Maximum Contaminant Level Violation, Acute (TCR)
Health-based
Coliform (TCR)
May 1, 1993 – May 31, 1993
Resolved
Monitoring, Repeat Minor (TCR)
—
Coliform (TCR)
May 1, 1993 – May 31, 1993
Resolved
Monitoring, Repeat Minor (TCR)
—
Coliform (TCR)
April 1, 1993 – April 30, 1993
Resolved
Monitoring, Repeat Minor (TCR)
—
Coliform (TCR)
October 1, 1992 – October 31, 1992
Resolved
Monitoring, Repeat Major (TCR)
—
Coliform (TCR)
October 1, 1992 – October 31, 1992
Archived
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
September 1, 1992 – September 30, 1992
Archived
Monitoring, Repeat Minor (TCR)
—
Coliform (TCR)
September 1, 1992 – September 30, 1992
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
August 1, 1992 – August 31, 1992
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
June 1, 1991 – June 30, 1991
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
April 1, 1991 – April 30, 1991
Resolved
Monitoring, Regular
—
Combined Radium (-226 and -228)
June 1, 1976 – May 31, 1980
Archived

Archived closed in EPA's records (typically due to age or a data correction)Resolved addressed and confirmed by the stateUnaddressed no corrective action on record yet

Period	Violation	Contaminant / rule	Health-based	Status
December 1, 2025 – December 31, 2025	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	—	Archived
March 1, 2025 – March 31, 2025	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	—	Resolved
February 1, 2025 – February 28, 2025	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	—	Resolved
January 1, 2025 – January 31, 2025	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	—	Resolved
December 1, 2024 – December 31, 2024	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	—	Resolved
November 1, 2024 – November 30, 2024	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	—	Resolved
October 1, 2024	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Unaddressed
October 1, 2024 – October 31, 2024	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	—	Resolved
September 1, 2024 – September 30, 2024	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	—	Resolved
August 1, 2024 – August 31, 2024	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	—	Resolved
July 1, 2024 – July 31, 2024	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	—	Resolved
January 1, 2022 – December 31, 2024	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	Resolved
January 1, 2022 – December 31, 2024	Monitoring and Reporting (DBP)	TTHM	—	Resolved
October 1, 2020 – August 26, 2021	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Resolved
August 1, 2020 – August 31, 2020	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	—	Resolved
January 1, 2018 – December 31, 2018	Failure to Conduct Assessment Monitoring	COLIPHAGE	—	Resolved
January 1, 2018 – December 31, 2018	Monitoring, Regular	Nitrate	—	Resolved
October 1, 2017 – September 30, 2020	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	Resolved
October 1, 2017 – September 30, 2020	Monitoring and Reporting (DBP)	TTHM	—	Resolved
January 1, 2017 – October 6, 2017	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Resolved
December 1, 2016 – December 31, 2016	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	—	Resolved
January 1, 2014 – February 12, 2014	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Resolved
July 1, 2012 – July 31, 2012	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
January 1, 2012 – December 31, 2012	Failure to Conduct Assessment Monitoring	COLIPHAGE	—	Resolved
January 1, 2009 – January 31, 2009	Monitoring and Reporting (DBP)	TTHM	—	Resolved
January 1, 2009 – December 31, 2009	Monitoring, Regular	Nitrate	—	Resolved
January 1, 2008 – December 31, 2008	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	Resolved
January 1, 2008 – December 31, 2008	Monitoring and Reporting (DBP)	TTHM	—	Resolved
January 1, 2005 – December 31, 2007	Monitoring, Regular	Benzene	—	Resolved
January 1, 2005 – December 31, 2007	Monitoring, Regular	o-Dichlorobenzene	—	Resolved
January 1, 2005 – December 31, 2007	Monitoring, Regular	Vinyl chloride	—	Resolved
January 1, 2005 – December 31, 2007	Monitoring, Regular	trans-1,2-Dichloroethylene	—	Resolved
January 1, 2005 – December 31, 2007	Monitoring, Regular	1,2-Dichloroethane	—	Resolved
January 1, 2005 – December 31, 2007	Monitoring, Regular	Tetrachloroethylene	—	Resolved
June 1, 2002 – June 30, 2002	Monitoring, Repeat Major (TCR)	Coliform (TCR)	—	Resolved
February 1, 2000 – February 29, 2000	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Resolved
August 1, 1999 – August 31, 1999	Monitoring, Repeat Major (TCR)	Coliform (TCR)	—	Resolved
August 1, 1999 – August 31, 1999	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
July 1, 1999 – July 31, 1999	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
April 1, 1999 – April 30, 1999	Monitoring, Repeat Major (TCR)	Coliform (TCR)	—	Resolved
September 1, 1996 – September 30, 1996	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Resolved
July 1, 1996 – July 31, 1996	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Resolved
August 1, 1994 – August 31, 1994	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Resolved
July 1, 1994 – July 31, 1994	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
July 1, 1993 – July 31, 1993	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
May 1, 1993 – May 31, 1993	Maximum Contaminant Level Violation, Acute (TCR)	Coliform (TCR)	Health-based	Resolved
May 1, 1993 – May 31, 1993	Monitoring, Repeat Minor (TCR)	Coliform (TCR)	—	Resolved
April 1, 1993 – April 30, 1993	Monitoring, Repeat Minor (TCR)	Coliform (TCR)	—	Resolved
October 1, 1992 – October 31, 1992	Monitoring, Repeat Minor (TCR)	Coliform (TCR)	—	Resolved
October 1, 1992 – October 31, 1992	Monitoring, Repeat Major (TCR)	Coliform (TCR)	—	Archived
September 1, 1992 – September 30, 1992	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Archived
September 1, 1992 – September 30, 1992	Monitoring, Repeat Minor (TCR)	Coliform (TCR)	—	Resolved
August 1, 1992 – August 31, 1992	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
June 1, 1991 – June 30, 1991	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
April 1, 1991 – April 30, 1991	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Resolved
June 1, 1976 – May 31, 1980	Monitoring, Regular	Combined Radium (-226 and -228)	—	Archived

Archived closed in EPA's records (typically due to age or a data correction)Resolved addressed and confirmed by the stateUnaddressed no corrective action on record yet

Enforcement actions

October 10, 2025State Compliance achieved2 linked violations
April 28, 2025State Compliance achieved1 linked violation
April 28, 2025State Compliance achieved1 linked violation
April 28, 2025State Compliance achieved1 linked violation
April 28, 2025State Compliance achieved1 linked violation
April 28, 2025State Compliance achieved1 linked violation
April 28, 2025State Compliance achieved1 linked violation
April 28, 2025State Compliance achieved1 linked violation
April 28, 2025State Compliance achieved1 linked violation
April 28, 2025State Compliance achieved1 linked violation
July 23, 2024State Public Notification receivedgeneral compliance action — not tied to a specific violation on record
August 18, 2023State Public Notification receivedgeneral compliance action — not tied to a specific violation on record
November 16, 2021State Compliance achieved2 linked violations
August 26, 2021State Compliance achieved1 linked violation
September 30, 2020State Compliance achieved2 linked violations
March 29, 2019State Compliance achieved1 linked violation
October 6, 2017State Compliance achieved1 linked violation
January 26, 2017State Compliance achieved1 linked violation
February 12, 2014State Compliance achieved1 linked violation
February 4, 2013State Violation/Reminder Notice1 linked violation
January 25, 2013State Compliance achieved1 linked violation
January 17, 2013State Compliance achieved1 linked violation
December 11, 2012State Compliance achieved1 linked violation
October 1, 2012State Violation/Reminder Notice1 linked violation
September 13, 2012State Compliance achieved1 linked violation
August 30, 2012State Public Notification requested1 linked violation
January 5, 2011State Compliance achieved1 linked violation
January 5, 2011State Compliance achieved1 linked violation
January 5, 2011State Compliance achieved1 linked violation
January 5, 2011State Compliance achieved1 linked violation
January 5, 2011State Compliance achieved1 linked violation
January 5, 2011State Compliance achieved1 linked violation
January 5, 2011State Compliance achieved1 linked violation
January 5, 2011State Compliance achieved1 linked violation
January 5, 2011State Compliance achieved1 linked violation
January 5, 2011State Compliance achieved1 linked violation
January 5, 2011State Compliance achieved1 linked violation
October 5, 2010State Compliance achieved4 linked violations
March 22, 2010State Violation/Reminder Notice1 linked violation
March 16, 2010State Compliance achieved1 linked violation
March 15, 2010State Compliance achieved1 linked violation
March 15, 2010State Public Notification requested2 linked violations
February 22, 2010State Violation/Reminder Notice3 linked violations
August 31, 2009State Violation/Reminder Notice1 linked violation
August 26, 2009State Compliance achieved1 linked violation
January 1, 2007State Compliance achieved1 linked violation
October 4, 2006State Compliance achieved1 linked violation
April 5, 2004State Compliance achieved1 linked violation
September 6, 2002State Compliance achieved1 linked violation
April 5, 2002State Compliance achieved1 linked violation
February 8, 2002State Compliance achieved1 linked violation
August 9, 2001State Compliance achieved1 linked violation
August 9, 2001State Compliance achieved1 linked violation
August 9, 2001State Compliance achieved1 linked violation
August 9, 2001State Compliance achieved1 linked violation
August 9, 2001State Compliance achieved1 linked violation
August 9, 2001State Compliance achieved1 linked violation
August 9, 2001State Compliance achieved1 linked violation
August 9, 2001State Compliance achieved1 linked violation
August 9, 2001State Compliance achieved1 linked violation
August 9, 2001State Compliance achieved1 linked violation
August 9, 2001State Compliance achieved1 linked violation
August 9, 2001State Compliance achieved1 linked violation
August 9, 2001State Compliance achieved1 linked violation
August 9, 2001State Compliance achieved1 linked violation
August 9, 2001State Compliance achieved1 linked violation
August 9, 2001State Compliance achieved1 linked violation
August 9, 2001State Compliance achieved1 linked violation
December 7, 2000State Compliance achieved9 linked violations
December 8, 1999State Public Notification received1 linked violation
October 6, 1999State Public Notification received4 linked violations
August 19, 1999State Public Notification received1 linked violation
December 1, 1994State Public Notification requested1 linked violation
November 7, 1994State Public Notification received1 linked violation
September 1, 1994State Public Notification requested1 linked violation

Contact

MOSIER, CITY OF

541-760-9362

ENTERPRISE, OR 97828