CORNELIUS, OR · Washington County
CORNELIUS, CITY OF 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 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)
Violation history
Failure to Conduct Assessment Monitoring
—COLIPHAGE
January 1, 2024 – December 31, 2024
ResolvedConsumer Confidence Report Complete Failure to Report
—Consumer Confidence Rule
July 1, 2023 – July 20, 2023
ResolvedMonitoring, Regular
—DICHLOROMETHANE
July 1, 2022 – September 30, 2022
ResolvedMonitoring and Reporting (DBP)
—Total Haloacetic Acids (HAA5)
July 1, 2022 – September 30, 2022
ResolvedMonitoring and Reporting (DBP)
—TTHM
July 1, 2022 – September 30, 2022
ResolvedMonitoring, Regular
—Combined Uranium
April 1, 2020 – June 30, 2020
ResolvedMonitoring, Regular
—Gross Alpha, Excl. Radon and U
April 1, 2020 – June 30, 2020
ResolvedMonitoring, Regular
—Combined Radium (-226 and -228)
April 1, 2020 – June 30, 2020
ResolvedMonitoring, Routine (RTCR)
—Revised Total Coliform Rule
May 1, 2018 – May 31, 2018
ResolvedMonitoring and Reporting (DBP)
—Total Haloacetic Acids (HAA5)
April 1, 2014 – June 30, 2014
ResolvedMonitoring and Reporting (DBP)
—TTHM
April 1, 2014 – June 30, 2014
ResolvedMonitoring, Routine Minor (TCR)
—Coliform (TCR)
May 1, 2013 – May 31, 2013
ResolvedMonitoring, Routine Minor (TCR)
—Coliform (TCR)
September 1, 2012 – September 30, 2012
ResolvedMonitoring, Routine Major (TCR)
—Coliform (TCR)
February 1, 2009 – February 28, 2009
ResolvedMonitoring and Reporting (DBP)
—Total Haloacetic Acids (HAA5)
October 1, 2007 – December 31, 2007
ResolvedMonitoring and Reporting (DBP)
—TTHM
October 1, 2007 – December 31, 2007
ResolvedMonitoring and Reporting (DBP)
—Total Haloacetic Acids (HAA5)
July 1, 2007 – September 30, 2007
ResolvedMonitoring, Routine Major (TCR)
—Coliform (TCR)
July 1, 2007 – July 31, 2007
ResolvedMonitoring and Reporting (DBP)
—TTHM
July 1, 2007 – September 30, 2007
ResolvedMonitoring and Reporting (DBP)
—Total Haloacetic Acids (HAA5)
April 1, 2007 – June 30, 2007
ResolvedMonitoring and Reporting (DBP)
—TTHM
April 1, 2007 – June 30, 2007
ResolvedMonitoring, Repeat Major (TCR)
—Coliform (TCR)
October 1, 2006 – October 31, 2006
ResolvedMonitoring, Routine Minor (TCR)
—Coliform (TCR)
September 1, 2006 – September 30, 2006
ResolvedFollow-up Or Routine LCR Tap M/R
—Lead and Copper Rule
January 1, 2005 – September 22, 2005
ResolvedConsumer Confidence Report Inadequate Reporting
—Consumer Confidence Rule
October 19, 2004 – December 2, 2004
ResolvedConsumer Confidence Report Complete Failure to Report
—Consumer Confidence Rule
July 1, 2004 – December 2, 2004
ResolvedConsumer Confidence Report Inadequate Reporting
—Consumer Confidence Rule
October 19, 2003 – March 2, 2004
ResolvedConsumer Confidence Report Complete Failure to Report
—Consumer Confidence Rule
July 1, 2003 – March 2, 2004
ResolvedConsumer Confidence Report Complete Failure to Report
—Consumer Confidence Rule
July 1, 2000 – August 15, 2001
ResolvedMonitoring, Routine Minor (TCR)
—Coliform (TCR)
May 1, 1998 – May 31, 1998
ResolvedMonitoring, Repeat Major (TCR)
—Coliform (TCR)
September 1, 1996 – September 30, 1996
ResolvedMonitoring, Routine Minor (TCR)
—Coliform (TCR)
November 1, 1992 – November 30, 1992
ResolvedMonitoring, 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) | Total Haloacetic Acids (HAA5) | — | Resolved |
| April 1, 2014 – June 30, 2014 | Monitoring and Reporting (DBP) | TTHM | — | 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 – September 30, 2007 | Monitoring and Reporting (DBP) | Total Haloacetic Acids (HAA5) | — | Resolved |
| July 1, 2007 – July 31, 2007 | Monitoring, Routine Major (TCR) | Coliform (TCR) | — | Resolved |
| July 1, 2007 – September 30, 2007 | Monitoring and Reporting (DBP) | TTHM | — | Resolved |
| April 1, 2007 – June 30, 2007 | Monitoring and Reporting (DBP) | Total Haloacetic Acids (HAA5) | — | Resolved |
| April 1, 2007 – June 30, 2007 | Monitoring and Reporting (DBP) | TTHM | — | 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 |
| 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 |
| 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
Contact
CORNELIUS, CITY OF
503-702-6046
CORNELIUS, OR 97113-8912