UNION GAP WATER

Washington — Community Water System — PWSID: WA5390250

System Information

PWSID	WA5390250
System Name	UNION GAP WATER
System Type	Community Water System
Water Source	Ground Water
Activity Status	Active
Owner Type	Local
EPA Region	10
Serves School	No
Wholesaler	No
First Reported	Feb 7, 1981
Last Reported	Dec 11, 2025

Location & Contact

State	Washington
City	Union Gap
ZIP Code	98903
Address	PO BOX 3008
Organization	UNION GAP WATER
Phone	—

Population & Service

Population Served	6,433
Service Connections	1,981

Drinking Water Violations (24)

This water system has 24 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
Dec 1, 2017	Dec 31, 2017	Revised Total Coliform Rule	MON	No	Yes	—	—	—	Resolved	Dec 31, 2017	Revised Total Coliform Rule
Jan 1, 2008	Dec 31, 2010	Aldicarb sulfone	MR	No	Yes	—	—	—	Resolved	Dec 31, 2010	Synthetic Organic Chemicals
Jan 1, 2008	Dec 31, 2010	OXAMYL	MR	No	Yes	—	0.2 mg/L	—	Resolved	Dec 31, 2010	Synthetic Organic Chemicals
Jan 1, 2008	Dec 31, 2010	Aldicarb sulfoxide	MR	No	Yes	—	—	—	Resolved	Dec 31, 2010	Synthetic Organic Chemicals
Jan 1, 2008	Dec 31, 2010	Carbofuran	MR	No	Yes	—	0.04 mg/L	—	Resolved	Dec 31, 2010	Synthetic Organic Chemicals
Jan 1, 2008	Dec 31, 2010	Aldicarb	MR	No	Yes	—	—	—	Resolved	Dec 31, 2010	Synthetic Organic Chemicals
Oct 1, 2006	Dec 31, 2006	Diquat	MR	No	Yes	—	0.02 mg/L	—	Resolved	Dec 31, 2006	Synthetic Organic Chemicals
Jul 1, 2006	Sep 30, 2006	Diquat	MR	No	Yes	—	0.02 mg/L	—	Archived	Sep 30, 2006	Synthetic Organic Chemicals
Feb 1, 2005	Feb 28, 2005	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Archived	Feb 28, 2005	Total Coliform Rule
Nov 1, 2004	Nov 30, 2004	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Archived	Nov 30, 2004	Total Coliform Rule
Jul 1, 1999	Jul 31, 1999	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Archived	Jul 31, 1999	Total Coliform Rule
Jul 1, 1999	Jul 31, 1999	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Archived	Jul 31, 1999	Total Coliform Rule
Jul 1, 1999	Jul 31, 1999	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Archived	Jul 31, 1999	Total Coliform Rule
Sep 1, 1996	Sep 30, 1996	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Archived	Sep 30, 1996	Total Coliform Rule
Jun 1, 1996	Jun 30, 1996	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Archived	Jun 30, 1996	Total Coliform Rule
Oct 1, 1979	Oct 31, 1979	Nitrate	MR	No	No	—	10 mg/L	—	Archived	Oct 31, 1979	Nitrate Rule
Oct 1, 1979	Oct 31, 1979	Mercury	MR	No	No	—	0.002 mg/L	—	Archived	Oct 31, 1979	Inorganic Chemicals
Oct 1, 1979	Oct 31, 1979	Chromium	MR	No	No	—	0.1 mg/L	—	Archived	Oct 31, 1979	Inorganic Chemicals
Oct 1, 1979	Oct 31, 1979	Barium	MR	No	No	—	2 mg/L	—	Archived	Oct 31, 1979	Inorganic Chemicals
Oct 1, 1979	Oct 31, 1979	Fluoride	MR	No	No	—	4.0 mg/L	—	Archived	Oct 31, 1979	Inorganic Chemicals
Oct 1, 1979	Oct 31, 1979	Gross Alpha, Excl. Radon and U	MR	No	No	—	15 pCi/L	—	Archived	Oct 31, 1979	Radionuclides and Revised Rad Rule
Oct 1, 1979	Oct 31, 1979	Selenium	MR	No	No	—	0.05 mg/L	—	Archived	Oct 31, 1979	Inorganic Chemicals
Oct 1, 1979	Oct 31, 1979	Cadmium	MR	No	No	—	0.005 mg/L	—	Archived	Oct 31, 1979	Inorganic Chemicals
Oct 1, 1979	Oct 31, 1979	Arsenic	MR	No	No	—	0.010 mg/L	—	Archived	Oct 31, 1979	Arsenic 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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