CORNELIUS, CITY OF

Oregon — Community Water System — PWSID: OR4100218

System Information

PWSID	OR4100218
System Name	CORNELIUS, CITY OF
System Type	Community Water System
Water Source	Surface Water Purchased
Activity Status	Active
Owner Type	Local
EPA Region	10
Serves School	No
Wholesaler	No
First Reported	Mar 12, 1979
Last Reported	Dec 23, 2025

Location & Contact

State	Oregon
City	CORNELIUS
ZIP Code	97113-8912
Address	1355 N BARLOW ST
Organization	CORNELIUS, CITY OF
Phone	503-702-6046

Population & Service

Population Served	14,490
Service Connections	4,153

Drinking Water Violations (42)

This water system has 42 violations recorded in the EPA SDWIS database.

Begin Date	End Date	Contaminant	Category	Health-Based	Major	Measured	Federal MCL	State MCL	Status	Return to Compliance	Rule
Jan 1, 2024	Dec 31, 2024	COLIPHAGE	MR	No	Yes	—	—	—	Archived	Dec 31, 2024	Ground Water Rule
Jul 1, 2023	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Jul 20, 2023	Consumer Confidence Rule
Jul 1, 2022	Sep 30, 2022	Total Haloacetic Acids (HAA5)	MR	No	Yes	—	0.060 mg/L	—	Resolved	Sep 30, 2022	Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2022	Sep 30, 2022	TTHM	MR	No	Yes	—	0.080 mg/L	—	Resolved	Sep 30, 2022	Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2022	Sep 30, 2022	DICHLOROMETHANE	MR	No	Yes	—	0.005 mg/L	—	Resolved	Sep 30, 2022	Volatile Organic Chemicals
Apr 1, 2020	Jun 30, 2020	Gross Alpha, Excl. Radon and U	MR	No	Yes	—	15 pCi/L	—	Resolved	Jun 30, 2020	Radionuclides and Revised Rad Rule
Apr 1, 2020	Jun 30, 2020	Combined Radium (-226 and -228)	MR	No	Yes	—	5 pCi/L	—	Resolved	Jun 30, 2020	Radionuclides and Revised Rad Rule
Apr 1, 2020	Jun 30, 2020	Combined Uranium	MR	No	Yes	—	30 ug/L	—	Resolved	Jun 30, 2020	Radionuclides and Revised Rad Rule
May 1, 2018	May 31, 2018	Revised Total Coliform Rule	MON	No	No	—	—	—	Resolved	May 31, 2018	Revised Total Coliform Rule
Apr 1, 2014	Jun 30, 2014	TTHM	MR	No	Yes	—	0.080 mg/L	—	Resolved	Jun 30, 2014	Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2014	Jun 30, 2014	Total Haloacetic Acids (HAA5)	MR	No	Yes	—	0.060 mg/L	—	Resolved	Jun 30, 2014	Stage 2 Disinfectants and Disinfection Byproducts Rule
May 1, 2013	May 31, 2013	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	May 31, 2013	Total Coliform Rule
Sep 1, 2012	Sep 30, 2012	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Sep 30, 2012	Total Coliform Rule
Sep 1, 2012	Sep 30, 2012	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Sep 30, 2012	Total Coliform Rule
Feb 1, 2009	Feb 28, 2009	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Feb 28, 2009	Total Coliform Rule
Oct 1, 2007	Dec 31, 2007	Total Haloacetic Acids (HAA5)	MR	No	Yes	—	0.060 mg/L	—	Resolved	Dec 31, 2007	Stage 1 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2007	Dec 31, 2007	TTHM	MR	No	Yes	—	0.080 mg/L	—	Resolved	Dec 31, 2007	Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2007	Sep 30, 2007	Total Haloacetic Acids (HAA5)	MR	No	Yes	—	0.060 mg/L	—	Resolved	Sep 30, 2007	Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2007	Sep 30, 2007	TTHM	MR	No	Yes	—	0.080 mg/L	—	Resolved	Sep 30, 2007	Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2007	Jul 31, 2007	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Jul 31, 2007	Total Coliform Rule
Apr 1, 2007	Jun 30, 2007	Total Haloacetic Acids (HAA5)	MR	No	Yes	—	0.060 mg/L	—	Resolved	Jun 30, 2007	Stage 1 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2007	Jun 30, 2007	TTHM	MR	No	Yes	—	0.080 mg/L	—	Resolved	Jun 30, 2007	Stage 1 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2006	Oct 31, 2006	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Oct 31, 2006	Total Coliform Rule
Sep 1, 2006	Sep 30, 2006	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Sep 30, 2006	Total Coliform Rule
Jan 1, 2005	—	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Sep 22, 2005	Lead and Copper Rule
Oct 19, 2004	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Dec 2, 2004	Consumer Confidence Rule
Jul 1, 2004	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Dec 2, 2004	Consumer Confidence Rule
Oct 19, 2003	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Mar 2, 2004	Consumer Confidence Rule
Jul 1, 2003	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Mar 2, 2004	Consumer Confidence Rule
Jun 1, 2002	Jun 30, 2002	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Jun 30, 2002	Total Coliform Rule
Nov 1, 2001	Nov 30, 2001	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Nov 30, 2001	Total Coliform Rule
Oct 1, 2000	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Aug 15, 2001	Consumer Confidence Rule
Jul 1, 2000	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Aug 15, 2001	Consumer Confidence Rule
Jan 1, 1999	Jan 31, 1999	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Jan 31, 1999	Total Coliform Rule
May 1, 1998	May 31, 1998	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	May 31, 1998	Total Coliform Rule
Sep 1, 1996	Sep 30, 1996	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Sep 30, 1996	Total Coliform Rule
Mar 1, 1996	Mar 31, 1996	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Mar 31, 1996	Total Coliform Rule
Mar 1, 1996	Mar 31, 1996	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Mar 31, 1996	Total Coliform Rule
Mar 1, 1996	Mar 31, 1996	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Mar 31, 1996	Total Coliform Rule
Nov 1, 1992	Nov 30, 1992	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Nov 30, 1992	Total Coliform Rule
Jul 1, 1992	Jan 31, 1993	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Jan 31, 1993	Lead and Copper Rule
May 1, 1991	May 31, 1991	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	May 31, 1991	Total Coliform Rule

About This Water System

Public water system data comes from the EPA Safe Drinking Water Information System (SDWIS). Systems with violations must notify customers. Contact your water utility for the latest annual water quality report.

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