ILWACO WATER DEPARTMENT CITY OF

Washington — Community Water System — PWSID: WA5335500

System Information

PWSID	WA5335500
System Name	ILWACO WATER DEPARTMENT CITY OF
System Type	Community Water System
Water Source	Surface 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	ILWACO
ZIP Code	98624
Address	PO BOX 548
Organization	ILWACO WATER DEPARTMENT CITY OF
Phone	—

Population & Service

Population Served	2,757
Service Connections	703

Drinking Water Violations (158)

This water system has 158 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, 2016	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Oct 24, 2016	Consumer Confidence Rule
Apr 1, 2015	Jun 30, 2015	TTHM	MR	No	Yes	—	0.080 mg/L	—	Resolved	Jun 30, 2015	Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2015	Jun 30, 2015	Total Haloacetic Acids (HAA5)	MR	No	Yes	—	0.060 mg/L	—	Resolved	Jun 30, 2015	Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2015	Mar 31, 2015	TTHM	MR	No	Yes	—	0.080 mg/L	—	Resolved	Mar 31, 2015	Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2015	Mar 31, 2015	Total Haloacetic Acids (HAA5)	MR	No	Yes	—	0.060 mg/L	—	Resolved	Mar 31, 2015	Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2009	—	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Dec 31, 2009	Lead and Copper Rule
Jan 1, 2009	—	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Dec 31, 2009	Lead and Copper Rule
Jan 1, 2009	—	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Dec 31, 2009	Lead and Copper Rule
Jan 1, 2009	—	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Dec 31, 2009	Lead and Copper Rule
Jan 1, 2009	—	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Dec 31, 2009	Lead and Copper Rule
Jan 1, 2009	—	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Dec 31, 2009	Lead and Copper Rule
Jan 1, 2009	—	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Dec 31, 2009	Lead and Copper Rule
Jan 1, 2009	—	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Dec 31, 2009	Lead and Copper Rule
Jan 1, 2009	—	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Dec 31, 2009	Lead and Copper Rule
Jan 1, 2009	—	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Dec 31, 2009	Lead and Copper Rule
Jan 1, 2009	—	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Dec 31, 2009	Lead and Copper Rule
Jan 1, 2007	Dec 31, 2007	Barium	MR	No	Yes	—	2 mg/L	—	Resolved	Dec 31, 2007	Inorganic Chemicals
Jan 1, 2007	Dec 31, 2007	Chromium	MR	No	Yes	—	0.1 mg/L	—	Resolved	Dec 31, 2007	Inorganic Chemicals
Jan 1, 2007	Dec 31, 2007	CYANIDE	MR	No	Yes	—	0.2 mg/L	—	Resolved	Dec 31, 2007	Inorganic Chemicals
Jan 1, 2007	Dec 31, 2007	trans-1,2-Dichloroethylene	MR	No	Yes	—	0.1 mg/L	—	Resolved	Dec 31, 2007	Volatile Organic Chemicals
Jan 1, 2007	Dec 31, 2007	CYANIDE	MR	No	Yes	—	0.2 mg/L	—	Resolved	Dec 31, 2007	Inorganic Chemicals
Jan 1, 2007	Dec 31, 2007	CYANIDE	MR	No	Yes	—	0.2 mg/L	—	Resolved	Dec 31, 2007	Inorganic Chemicals
Jan 1, 2007	Dec 31, 2007	CYANIDE	MR	No	Yes	—	0.2 mg/L	—	Resolved	Dec 31, 2007	Inorganic Chemicals
Jan 1, 2007	Dec 31, 2007	Chromium	MR	No	Yes	—	0.1 mg/L	—	Resolved	Dec 31, 2007	Inorganic Chemicals
Jan 1, 2007	Dec 31, 2007	Chromium	MR	No	Yes	—	0.1 mg/L	—	Resolved	Dec 31, 2007	Inorganic Chemicals
Jan 1, 2007	Dec 31, 2007	Chromium	MR	No	Yes	—	0.1 mg/L	—	Resolved	Dec 31, 2007	Inorganic Chemicals
Jan 1, 2007	Dec 31, 2007	Chromium	MR	No	Yes	—	0.1 mg/L	—	Resolved	Dec 31, 2007	Inorganic Chemicals
Jan 1, 2007	Dec 31, 2007	CYANIDE	MR	No	Yes	—	0.2 mg/L	—	Resolved	Dec 31, 2007	Inorganic Chemicals
Jan 1, 2007	Dec 31, 2007	Chromium	MR	No	Yes	—	0.1 mg/L	—	Resolved	Dec 31, 2007	Inorganic Chemicals
Jan 1, 2007	Dec 31, 2007	Chromium	MR	No	Yes	—	0.1 mg/L	—	Resolved	Dec 31, 2007	Inorganic Chemicals
Jan 1, 2007	Dec 31, 2007	Arsenic	MR	No	Yes	—	0.010 mg/L	—	Resolved	Dec 31, 2007	Arsenic Rule
Jan 1, 2007	Dec 31, 2007	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2007	Nitrate Rule
Jan 1, 2007	Dec 31, 2007	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2007	Nitrate Rule
Jan 1, 2007	Dec 31, 2007	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2007	Nitrate Rule
Jan 1, 2007	Dec 31, 2007	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2007	Nitrate Rule
Jan 1, 2007	Dec 31, 2007	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2007	Nitrate Rule
Jan 1, 2007	Dec 31, 2007	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2007	Nitrate Rule
Jan 1, 2007	Dec 31, 2007	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2007	Nitrate Rule
Jan 1, 2007	Dec 31, 2007	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2007	Nitrate Rule
Jan 1, 2007	Dec 31, 2007	Arsenic	MR	No	Yes	—	0.010 mg/L	—	Resolved	Dec 31, 2007	Arsenic Rule
Jan 1, 2007	Dec 31, 2007	Arsenic	MR	No	Yes	—	0.010 mg/L	—	Resolved	Dec 31, 2007	Arsenic Rule
Jan 1, 2007	Dec 31, 2007	Cadmium	MR	No	Yes	—	0.005 mg/L	—	Resolved	Dec 31, 2007	Inorganic Chemicals
Jan 1, 2007	Dec 31, 2007	Arsenic	MR	No	Yes	—	0.010 mg/L	—	Resolved	Dec 31, 2007	Arsenic Rule
Jan 1, 2007	Dec 31, 2007	Arsenic	MR	No	Yes	—	0.010 mg/L	—	Resolved	Dec 31, 2007	Arsenic Rule
Jan 1, 2007	Dec 31, 2007	Barium	MR	No	Yes	—	2 mg/L	—	Resolved	Dec 31, 2007	Inorganic Chemicals
Jan 1, 2007	Dec 31, 2007	Barium	MR	No	Yes	—	2 mg/L	—	Resolved	Dec 31, 2007	Inorganic Chemicals
Jan 1, 2007	Dec 31, 2007	Barium	MR	No	Yes	—	2 mg/L	—	Resolved	Dec 31, 2007	Inorganic Chemicals
Jan 1, 2007	Dec 31, 2007	Barium	MR	No	Yes	—	2 mg/L	—	Resolved	Dec 31, 2007	Inorganic Chemicals
Jan 1, 2007	Dec 31, 2007	Barium	MR	No	Yes	—	2 mg/L	—	Resolved	Dec 31, 2007	Inorganic Chemicals
Jan 1, 2007	Dec 31, 2007	Barium	MR	No	Yes	—	2 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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