Alerts indicate water quality tests with analytical results greater than the detection limit or one-half of the maximum allowable contaminant level which may require some follow-up actions by Drinking Water Services. See the Contacts link for reports on follow-up actions. Alerts are not water quality violations. Violations for this water system can be found here.

Alert Type Abbreviations:  CHEM = Chemical, COLI = Coliform, LCRE = Lead and copper corrosion control

Response Time is the number of days from the alert date to the contact report date.
Results:  12 alerts found for this water system.Hide response time

Water Quality Alerts
Alert ID	Sample Date	Alert Date	Source ID	Source Name	Alert Type	Contaminant	Result	Alert Level	MCL	Contact Report	Response Time (Days)
CHEM9590	11/03/2021	12/16/2021	EP-A	EP FOR TUALATIN RIVER	CHEM	HEXACHLOROCYCLOPENTADIENE	0.00015	0.0001	0.05	12/17/2021	1
LCRE24635	12/01/2018	01/04/2019	EP-A	EP FOR TUALATIN RIVER	LCRE	LCR EXCURSION	1	>0		01/08/2019	4
CHEM8197	11/05/2018	01/07/2019	EP-A	EP FOR TUALATIN RIVER	CHEM	HEXACHLOROCYCLOPENTADIENE	0.00014	0.0001	0.05	01/08/2019	1
CHEM2465	04/10/2007	05/03/2007	DIST-A	Distribution System	CHEM	TOTAL HALOACETIC ACIDS (HAA5)	0.0639	0.06	0.06
CHEM2465	04/10/2007	05/03/2007	DIST-A	Distribution System	CHEM	TOTAL HALOACETIC ACIDS (HAA5)	0.0634	0.06	0.06
CHEM2465	04/10/2007	05/03/2007	DIST-A	Distribution System	CHEM	TOTAL HALOACETIC ACIDS (HAA5)	0.0642	0.06	0.06
CHEM2465	04/10/2007	05/03/2007	DIST-A	Distribution System	CHEM	TOTAL HALOACETIC ACIDS (HAA5)	0.0633	0.06	0.06
COLI3642	10/10/2006	10/13/2006	DIST-A	Distribution System	COLI	COLIFORM, TOTAL (TCR)	Present	Present	Present
COLI2205	07/12/2005	07/26/2005	DIST-A	Distribution System	COLI	COLIFORM, TOTAL (TCR)	Present	Present	Present
COLI2205	07/12/2005	07/26/2005	DIST-A	Distribution System	COLI	COLIFORM, TOTAL (TCR)	Present	Present	Present
CHEM1625	04/12/2005	06/03/2005	DIST-A	Distribution System	CHEM	TOTAL HALOACETIC ACIDS (HAA5)	0.0606	0.06	0.06
COLI1080	03/30/2004	04/06/2004	DIST-A	Distribution System	COLI	COLIFORM, TOTAL (TCR)	Present	Present	Present

Archived Alerts (SWS database)
Date	Source	Chemical	Results mg/l	MCL mg/l
09/29/1993	A--STANDARD ENTRY POINT	Chloromethane	0.001
11/13/2001		Coliform
10/08/1997		Coliform
11/27/1996		Coliform
10/09/1996		Coliform

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