MOSSYROCK PUBLIC UTILITY CITY OF

Washington — Community Water System — PWSID: WA5356350

System Information

PWSID	WA5356350
System Name	MOSSYROCK PUBLIC UTILITY CITY OF
System Type	Community Water System
Water Source	Ground Water
Activity Status	Active
Owner Type	Local
EPA Region	10
Serves School	No
Wholesaler	Yes
First Reported	Feb 7, 1981
Last Reported	Dec 11, 2025

Location & Contact

State	Washington
City	Mossyrock
ZIP Code	98564
Address	PO Box 477
Organization	MOSSYROCK PUBLIC UTILITY CITY OF
Phone	—

Population & Service

Population Served	1,553
Service Connections	532

Drinking Water Violations (49)

This water system has 49 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, 2025	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Aug 29, 2025	Consumer Confidence Rule
Jul 1, 2024	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Feb 19, 2025	Consumer Confidence Rule
Jul 1, 2023	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Sep 29, 2023	Consumer Confidence Rule
Jul 1, 2016	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Dec 5, 2016	Consumer Confidence Rule
Feb 1, 2016	Feb 29, 2016	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Feb 29, 2016	Total Coliform Rule
Jan 1, 2015	Dec 31, 2015	Total Haloacetic Acids (HAA5)	MR	No	Yes	—	0.060 mg/L	—	Resolved	Dec 31, 2015	Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2015	Dec 31, 2015	TTHM	MR	No	Yes	—	0.080 mg/L	—	Resolved	Dec 31, 2015	Stage 2 Disinfectants and Disinfection Byproducts Rule
Nov 1, 2014	Nov 30, 2014	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Nov 30, 2014	Total Coliform Rule
Aug 1, 2014	Aug 31, 2014	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Aug 31, 2014	Total Coliform Rule
Jan 1, 2014	Dec 31, 2014	Total Haloacetic Acids (HAA5)	MR	No	Yes	—	0.060 mg/L	—	Resolved	Dec 31, 2014	Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2014	Dec 31, 2014	TTHM	MR	No	Yes	—	0.080 mg/L	—	Resolved	Dec 31, 2014	Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2013	Dec 31, 2013	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2013	Nitrate Rule
Jan 1, 2013	Dec 31, 2013	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2013	Nitrate Rule
Jul 1, 2011	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Nov 2, 2011	Consumer Confidence Rule
Jul 1, 2010	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Oct 26, 2010	Consumer Confidence Rule
Jan 1, 2008	Dec 31, 2008	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2008	Nitrate Rule
Jan 1, 2008	Dec 31, 2008	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2008	Nitrate Rule
Jan 1, 2008	Dec 31, 2008	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2008	Nitrate Rule
Jan 1, 2008	Dec 31, 2008	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2008	Nitrate Rule
Jan 1, 2008	Dec 31, 2008	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2008	Nitrate Rule
Jan 1, 2008	Dec 31, 2008	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2008	Nitrate Rule
Jan 1, 2008	Dec 31, 2008	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2008	Nitrate Rule
Jan 1, 2008	Dec 31, 2008	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2008	Nitrate Rule
Jan 1, 2008	Dec 31, 2008	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2008	Nitrate Rule
Jan 1, 2008	Dec 31, 2008	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2008	Nitrate Rule
Jan 1, 2008	Dec 31, 2008	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2008	Nitrate Rule
Jan 1, 2008	Dec 31, 2008	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2008	Nitrate Rule
Jan 1, 2008	Dec 31, 2008	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2008	Nitrate Rule
Jan 1, 2008	Dec 31, 2008	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2008	Nitrate Rule
Jun 1, 2005	Jun 30, 2005	Coliform (TCR)	MR	No	No	—	5% of samples	—	Archived	Jun 30, 2005	Total Coliform Rule
Oct 1, 2004	Oct 31, 2004	Coliform (TCR)	MR	No	No	—	5% of samples	—	Archived	Oct 31, 2004	Total Coliform Rule
Apr 1, 1996	Apr 30, 1996	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Archived	Apr 30, 1996	Total Coliform Rule
Jun 1, 1995	Jun 30, 1995	Coliform (TCR)	MR	No	Yes	—	5% of samples	—	Archived	Jun 30, 1995	Total Coliform Rule
Apr 1, 1995	Apr 30, 1995	Coliform (TCR)	MR	No	Yes	—	5% of samples	—	Archived	Apr 30, 1995	Total Coliform Rule
Sep 1, 1993	Sep 30, 1993	Coliform (TCR)	MR	No	Yes	—	5% of samples	—	Archived	Sep 30, 1993	Total Coliform Rule
Sep 1, 1993	Sep 30, 1993	Coliform (TCR)	MR	No	Yes	—	5% of samples	—	Archived	Sep 30, 1993	Total Coliform Rule
Apr 1, 1993	Apr 30, 1993	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Archived	Apr 30, 1993	Total Coliform Rule
Apr 1, 1993	Apr 30, 1993	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Archived	Apr 30, 1993	Total Coliform Rule
Nov 1, 1992	Nov 30, 1992	Coliform (TCR)	MR	No	Yes	—	5% of samples	—	Archived	Nov 30, 1992	Total Coliform Rule
Nov 1, 1992	Nov 30, 1992	Coliform (TCR)	MR	No	Yes	—	5% of samples	—	Archived	Nov 30, 1992	Total Coliform Rule
Oct 1, 1979	Oct 31, 1979	Arsenic	MR	No	No	—	0.010 mg/L	—	Archived	Oct 31, 1979	Arsenic 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	Cadmium	MR	No	No	—	0.005 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	Mercury	MR	No	No	—	0.002 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	Selenium	MR	No	No	—	0.05 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	Chromium	MR	No	No	—	0.1 mg/L	—	Archived	Oct 31, 1979	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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