Is CORNELIUS, CITY OF required to publish a Consumer Confidence Report?

Yes. CORNELIUS, CITY OF is a community water system, and federal rules (40 CFR 141 Subpart O) require every community water system to publish a Consumer Confidence Report each year.

When is CORNELIUS, CITY OF’s next Consumer Confidence Report due?

CORNELIUS, CITY OF’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.

What is a Consumer Confidence Report?

A Consumer Confidence Report (CCR) is the annual drinking water quality report that community water systems must provide to the people they serve. It lists the contaminants detected in the system’s water during the year, where the water comes from, and how the results compare with federal limits. EPA’s revised CCR rule takes effect January 1, 2027, and the first reports in the new format are due July 1, 2027.

CORNELIUS, OR · Washington County

CORNELIUS, CITY OF Water System

Consumer Confidence Report status

CORNELIUS, CITY OF must publish a Consumer Confidence Report — the annual drinking water quality report covering calendar year 2026 — by July 1, 2027.

As of August 1, 2026, EPA's federal records show no open violations for CORNELIUS, CITY OF.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed August 1, 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): OR4100218
System type: Community Water System
Population served: 14,490
Service connections: 4,153
Ownership: local government
Water source: surface water (rivers, lakes, or reservoirs)

CORNELIUS, CITY OF is one of 63 community water systems in Oregon in the 10,001 to 100,000 people size category, serving 14,490 people from surface water.

As of August 1, 2026, its federal record holds 35 entries between 1991 and 2024, all of which EPA lists as closed.

Of the 35, 29 are monitoring and reporting requirements — the category that accounts for about four in five of all violations in EPA's national dataset — rather than findings about the water itself. The record involves the Total Coliform Rules, the Consumer Confidence Rule, and the Stage 1 Disinfectants and Disinfection Byproducts Rule.

Violation history

Failure to Conduct Assessment Monitoring
—
COLIPHAGE
January 1, 2024 – December 31, 2024
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2023 – July 20, 2023
Resolved
Monitoring, Regular
—
DICHLOROMETHANE
July 1, 2022 – September 30, 2022
Resolved
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
July 1, 2022 – September 30, 2022
Resolved
Monitoring and Reporting (DBP)
—
TTHM
July 1, 2022 – September 30, 2022
Resolved
Monitoring, Regular
—
Combined Uranium
April 1, 2020 – June 30, 2020
Resolved
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
April 1, 2020 – June 30, 2020
Resolved
Monitoring, Regular
—
Combined Radium (-226 and -228)
April 1, 2020 – June 30, 2020
Resolved
Monitoring, Routine (RTCR)
—
Revised Total Coliform Rule
May 1, 2018 – May 31, 2018
Resolved
Monitoring and Reporting (DBP)
—
TTHM
April 1, 2014 – June 30, 2014
Resolved
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
April 1, 2014 – June 30, 2014
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
May 1, 2013 – May 31, 2013
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
September 1, 2012 – September 30, 2012
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
February 1, 2009 – February 28, 2009
Resolved
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
October 1, 2007 – December 31, 2007
Resolved
Monitoring and Reporting (DBP)
—
TTHM
October 1, 2007 – December 31, 2007
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
July 1, 2007 – July 31, 2007
Resolved
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
July 1, 2007 – September 30, 2007
Resolved
Monitoring and Reporting (DBP)
—
TTHM
July 1, 2007 – September 30, 2007
Resolved
Monitoring and Reporting (DBP)
—
TTHM
April 1, 2007 – June 30, 2007
Resolved
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
April 1, 2007 – June 30, 2007
Resolved
Monitoring, Repeat Major (TCR)
—
Coliform (TCR)
October 1, 2006 – October 31, 2006
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
September 1, 2006 – September 30, 2006
Resolved
Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
January 1, 2005 – September 22, 2005
Resolved
Consumer Confidence Report Inadequate Reporting
—
Consumer Confidence Rule
October 19, 2004 – December 2, 2004
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2004 – December 2, 2004
Resolved
Consumer Confidence Report Inadequate Reporting
—
Consumer Confidence Rule
October 19, 2003 – March 2, 2004
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2003 – March 2, 2004
Resolved
Monitoring, Repeat Minor (TCR)
—
Coliform (TCR)
June 1, 2002 – June 30, 2002
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2000 – August 15, 2001
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
May 1, 1998 – May 31, 1998
Resolved
Monitoring, Repeat Major (TCR)
—
Coliform (TCR)
September 1, 1996 – September 30, 1996
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
March 1, 1996 – March 31, 1996
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
November 1, 1992 – November 30, 1992
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
May 1, 1991 – May 31, 1991
Resolved

Resolved addressed and confirmed by the state

Period	Violation	Contaminant / rule	Health-based	Status
January 1, 2024 – December 31, 2024	Failure to Conduct Assessment Monitoring	COLIPHAGE	—	Resolved
July 1, 2023 – July 20, 2023	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
July 1, 2022 – September 30, 2022	Monitoring, Regular	DICHLOROMETHANE	—	Resolved
July 1, 2022 – September 30, 2022	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	Resolved
July 1, 2022 – September 30, 2022	Monitoring and Reporting (DBP)	TTHM	—	Resolved
April 1, 2020 – June 30, 2020	Monitoring, Regular	Combined Uranium	—	Resolved
April 1, 2020 – June 30, 2020	Monitoring, Regular	Gross Alpha, Excl. Radon and U	—	Resolved
April 1, 2020 – June 30, 2020	Monitoring, Regular	Combined Radium (-226 and -228)	—	Resolved
May 1, 2018 – May 31, 2018	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	—	Resolved
April 1, 2014 – June 30, 2014	Monitoring and Reporting (DBP)	TTHM	—	Resolved
April 1, 2014 – June 30, 2014	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	Resolved
May 1, 2013 – May 31, 2013	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Resolved
September 1, 2012 – September 30, 2012	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Resolved
February 1, 2009 – February 28, 2009	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
October 1, 2007 – December 31, 2007	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	Resolved
October 1, 2007 – December 31, 2007	Monitoring and Reporting (DBP)	TTHM	—	Resolved
July 1, 2007 – July 31, 2007	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
July 1, 2007 – September 30, 2007	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	Resolved
July 1, 2007 – September 30, 2007	Monitoring and Reporting (DBP)	TTHM	—	Resolved
April 1, 2007 – June 30, 2007	Monitoring and Reporting (DBP)	TTHM	—	Resolved
April 1, 2007 – June 30, 2007	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	Resolved
October 1, 2006 – October 31, 2006	Monitoring, Repeat Major (TCR)	Coliform (TCR)	—	Resolved
September 1, 2006 – September 30, 2006	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Resolved
January 1, 2005 – September 22, 2005	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Resolved
October 19, 2004 – December 2, 2004	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	—	Resolved
July 1, 2004 – December 2, 2004	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
October 19, 2003 – March 2, 2004	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	—	Resolved
July 1, 2003 – March 2, 2004	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
June 1, 2002 – June 30, 2002	Monitoring, Repeat Minor (TCR)	Coliform (TCR)	—	Resolved
July 1, 2000 – August 15, 2001	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
May 1, 1998 – May 31, 1998	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Resolved
September 1, 1996 – September 30, 1996	Monitoring, Repeat Major (TCR)	Coliform (TCR)	—	Resolved
March 1, 1996 – March 31, 1996	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
November 1, 1992 – November 30, 1992	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Resolved
May 1, 1991 – May 31, 1991	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Resolved

Resolved addressed and confirmed by the state

Enforcement actions

June 19, 1996State Public Notification received1 linked violation
May 31, 1996State Public Notification received1 linked violation

Common questions

Is CORNELIUS, CITY OF required to publish a Consumer Confidence Report?: Yes. CORNELIUS, CITY OF is a community water system, and federal rules (40 CFR 141 Subpart O) require every community water system to publish a Consumer Confidence Report each year.
When is CORNELIUS, CITY OF’s next Consumer Confidence Report due?: CORNELIUS, CITY OF’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does CORNELIUS, CITY OF have any open drinking water violations on record?: As of August 1, 2026, EPA's federal records show no open violations for CORNELIUS, CITY OF.
What is a Consumer Confidence Report?: A Consumer Confidence Report (CCR) is the annual drinking water quality report that community water systems must provide to the people they serve. It lists the contaminants detected in the system’s water during the year, where the water comes from, and how the results compare with federal limits. EPA’s revised CCR rule takes effect January 1, 2027, and the first reports in the new format are due July 1, 2027.

Contact

CORNELIUS, CITY OF

503-702-6046

CORNELIUS, OR 97113-8912