MAPLEWOOD ADDITION WATER COOP

Washington — Community Water System — PWSID: WA5351400

System Information

PWSID	WA5351400
System Name	MAPLEWOOD ADDITION WATER COOP
System Type	Community Water System
Water Source	Ground Water
Activity Status	Active
Owner Type	Private
EPA Region	10
Serves School	No
Wholesaler	No
First Reported	Feb 7, 1981
Last Reported	Dec 11, 2025

Location & Contact

State	Washington
City	Renton
ZIP Code	98058
Address	15709 143rd Ave SE
Organization	MAPLEWOOD ADDITION WATER COOP
Phone	—

Population & Service

Population Served	435
Service Connections	155

Drinking Water Violations (75)

This water system has 75 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
Jul 1, 2021	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Sep 30, 2021	Consumer Confidence Rule
Jul 1, 2019	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Sep 30, 2021	Consumer Confidence Rule
Jul 1, 2017	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Apr 10, 2018	Consumer Confidence Rule
Jul 1, 2016	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Dec 30, 2016	Consumer Confidence Rule
Jul 1, 2015	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Dec 2, 2015	Consumer Confidence Rule
Apr 1, 2015	Apr 30, 2015	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Apr 30, 2015	Total Coliform Rule
Jan 1, 2015	Dec 31, 2015	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2015	Nitrate Rule
Jan 1, 2015	—	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Dec 28, 2018	Lead and Copper Rule
Jul 1, 2013	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Oct 28, 2013	Consumer Confidence Rule
Jul 1, 2012	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Aug 31, 2012	Consumer Confidence Rule
Jun 1, 2012	Jun 30, 2012	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Jun 30, 2012	Total Coliform Rule
Jul 1, 2011	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Dec 1, 2011	Consumer Confidence Rule
Jul 1, 2010	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Nov 29, 2010	Consumer Confidence Rule
Mar 1, 2005	Mar 31, 2005	Coliform (TCR)	MR	No	No	—	5% of samples	—	Archived	Mar 31, 2005	Total Coliform Rule
Jan 1, 2005	Dec 31, 2007	Thallium, Total	MR	No	Yes	—	0.002 mg/L	—	Resolved	Dec 31, 2007	Inorganic Chemicals
Jan 1, 2005	Dec 31, 2007	CYANIDE	MR	No	Yes	—	0.2 mg/L	—	Resolved	Dec 31, 2007	Inorganic Chemicals
Jan 1, 2005	Dec 31, 2007	Thallium, Total	MR	No	Yes	—	0.002 mg/L	—	Resolved	Dec 31, 2007	Inorganic Chemicals
Jan 1, 2005	Dec 31, 2007	Thallium, Total	MR	No	Yes	—	0.002 mg/L	—	Resolved	Dec 31, 2007	Inorganic Chemicals
Jan 1, 2005	Dec 31, 2007	Carbon tetrachloride	MR	No	Yes	—	0.005 mg/L	—	Resolved	Dec 31, 2007	Volatile Organic Chemicals
Jan 1, 2005	Dec 31, 2007	Benzene	MR	No	Yes	—	0.005 mg/L	—	Resolved	Dec 31, 2007	Volatile Organic Chemicals
Jan 1, 2005	Dec 31, 2007	Toluene	MR	No	Yes	—	1 mg/L	—	Resolved	Dec 31, 2007	Volatile Organic Chemicals
Jan 1, 2005	Dec 31, 2007	Mercury	MR	No	Yes	—	0.002 mg/L	—	Resolved	Dec 31, 2007	Inorganic Chemicals
Jan 1, 2005	Dec 31, 2007	Mercury	MR	No	Yes	—	0.002 mg/L	—	Resolved	Dec 31, 2007	Inorganic Chemicals
Jan 1, 2005	Dec 31, 2007	Mercury	MR	No	Yes	—	0.002 mg/L	—	Resolved	Dec 31, 2007	Inorganic Chemicals
Jan 1, 2005	Dec 31, 2007	Styrene	MR	No	Yes	—	0.1 mg/L	—	Resolved	Dec 31, 2007	Volatile Organic Chemicals
Jan 1, 2005	Dec 31, 2007	Cadmium	MR	No	Yes	—	0.005 mg/L	—	Resolved	Dec 31, 2007	Inorganic Chemicals
Jan 1, 2005	Dec 31, 2007	Fluoride	MR	No	Yes	—	4.0 mg/L	—	Resolved	Dec 31, 2007	Inorganic Chemicals
Jan 1, 2005	Dec 31, 2007	Cadmium	MR	No	Yes	—	0.005 mg/L	—	Resolved	Dec 31, 2007	Inorganic Chemicals
Jan 1, 2005	Dec 31, 2007	CYANIDE	MR	No	Yes	—	0.2 mg/L	—	Resolved	Dec 31, 2007	Inorganic Chemicals
Jan 1, 2005	Dec 31, 2007	CYANIDE	MR	No	Yes	—	0.2 mg/L	—	Resolved	Dec 31, 2007	Inorganic Chemicals
Jan 1, 2005	Dec 31, 2007	Arsenic	MR	No	Yes	—	0.010 mg/L	—	Resolved	Dec 31, 2007	Arsenic Rule
Jan 1, 2005	Dec 31, 2007	Barium	MR	No	Yes	—	2 mg/L	—	Resolved	Dec 31, 2007	Inorganic Chemicals
Jan 1, 2005	Dec 31, 2007	Barium	MR	No	Yes	—	2 mg/L	—	Resolved	Dec 31, 2007	Inorganic Chemicals
Jan 1, 2005	Dec 31, 2007	Barium	MR	No	Yes	—	2 mg/L	—	Resolved	Dec 31, 2007	Inorganic Chemicals
Jan 1, 2005	Dec 31, 2007	1,1-Dichloroethylene	MR	No	Yes	—	0.007 mg/L	—	Resolved	Dec 31, 2007	Volatile Organic Chemicals
Jan 1, 2005	Dec 31, 2007	1,2,4-Trichlorobenzene	MR	No	Yes	—	0.07 mg/L	—	Resolved	Dec 31, 2007	Volatile Organic Chemicals
Jan 1, 2005	Dec 31, 2007	DICHLOROMETHANE	MR	No	Yes	—	0.005 mg/L	—	Resolved	Dec 31, 2007	Volatile Organic Chemicals
Jan 1, 2005	Dec 31, 2007	Arsenic	MR	No	Yes	—	0.010 mg/L	—	Resolved	Dec 31, 2007	Arsenic Rule
Jan 1, 2005	Dec 31, 2007	Beryllium, Total	MR	No	Yes	—	0.004 mg/L	—	Resolved	Dec 31, 2007	Inorganic Chemicals
Jan 1, 2005	Dec 31, 2007	Beryllium, Total	MR	No	Yes	—	0.004 mg/L	—	Resolved	Dec 31, 2007	Inorganic Chemicals
Jan 1, 2005	Dec 31, 2007	Beryllium, Total	MR	No	Yes	—	0.004 mg/L	—	Resolved	Dec 31, 2007	Inorganic Chemicals
Jan 1, 2005	Dec 31, 2007	Arsenic	MR	No	Yes	—	0.010 mg/L	—	Resolved	Dec 31, 2007	Arsenic Rule
Jan 1, 2005	Dec 31, 2007	Antimony, Total	MR	No	Yes	—	0.006 mg/L	—	Resolved	Dec 31, 2007	Inorganic Chemicals
Jan 1, 2005	Dec 31, 2007	1,2-Dichloroethane	MR	No	Yes	—	0.005 mg/L	—	Resolved	Dec 31, 2007	Volatile Organic Chemicals
Jan 1, 2005	Dec 31, 2007	trans-1,2-Dichloroethylene	MR	No	Yes	—	0.1 mg/L	—	Resolved	Dec 31, 2007	Volatile Organic Chemicals
Jan 1, 2005	Dec 31, 2007	Vinyl chloride	MR	No	Yes	—	0.002 mg/L	—	Resolved	Dec 31, 2007	Volatile Organic Chemicals
Jan 1, 2005	Dec 31, 2007	p-Dichlorobenzene	MR	No	Yes	—	0.075 mg/L	—	Resolved	Dec 31, 2007	Volatile Organic Chemicals
Jan 1, 2005	Dec 31, 2007	o-Dichlorobenzene	MR	No	Yes	—	0.6 mg/L	—	Resolved	Dec 31, 2007	Volatile Organic Chemicals
Jan 1, 2005	Dec 31, 2007	cis-1,2-Dichloroethylene	MR	No	Yes	—	0.07 mg/L	—	Resolved	Dec 31, 2007	Volatile Organic Chemicals
Jan 1, 2005	Dec 31, 2007	Antimony, Total	MR	No	Yes	—	0.006 mg/L	—	Resolved	Dec 31, 2007	Inorganic Chemicals

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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