Public water system · WA5341997

Active

Lakehaven Water and Sewer District

At a glance

Lakehaven Water and Sewer District (PWSID WA5341997) is an active community water system in King County, Washington. It reports serving 148,809 people through 46,077 service connections. Its primary water source is purchased surface water, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in July 2022.

This page covers its drinking water system only; sewer and wastewater service are not part of EPA's drinking water records.

Dataset updated October 2026 . Source: EPA SDWIS/ECHO public records.

Population served

148,809

Service connections

46,077

Primary source

SWP

Purchased surface water

System type

CWS

Community water system

System record

PWSIDWA5341997

System typeCommunity water system

Activity statusActive

Population served148,809

Service connections46,077

Primary water sourcePurchased surface water

Owner typeLocal government

Primacy agencyWA state drinking water program

City served—

StateWashington

ZIP—

CountyKing County

How does Lakehaven Water and Sewer District compare with other water systems in King County?

By EPA's size categories, Lakehaven Water and Sewer District is a very large system (more than 100,000 people). King County has 214 active public water systems, and Lakehaven Water and Sewer District is the 5th-largest of them by population served. Its population served is about 9.6 times the county average of 15,523 people per system, and accounts for 4.5% of the 3,321,960 people reported by systems filed under the county. Across Washington, the 4,705 active systems average 2,172 people each. Nationally, the average active community water system reports serving 6,703 people, so Lakehaven Water and Sewer District is about 22 times that figure.

What does “community water system” mean?

A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. Washington has 2,392 active community water systems, 51% of the state's 4,705 active systems. Purchased surface water means the system buys surface water from another public water system rather than drawing its own. 130 Washington systems (2.8%) list purchased surface water as their primary source.

Who owns and regulates Lakehaven Water and Sewer District?

EPA lists Lakehaven Water and Sewer District as owned by a local government. The WA state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 58 of the 214 active systems in King County (27%) are also owned by a local government.

Does Lakehaven Water and Sewer District have drinking water violations?

Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in July 2022. The violations listed here began between January 2007 and July 2022. By type: 11 monitoring and reporting and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Diquat (4 of them). EPA lists 12 as resolved. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed.

Began	Violation	Contaminant or rule	Health-based	Status
2022-07-01	Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71	Consumer Confidence Rulecode 7000	No	Resolved
2010-10-01	Monitoring and reportingMonitoring, Regular · code 03	Arseniccode 1005	No	Resolved
2007-10-01	Monitoring and reportingMonitoring, Regular · code 03	Diquatcode 2032	No	Resolved
2007-07-01	Monitoring and reportingMonitoring, Regular · code 03	Ethylene dibromide (EDB)code 2946	No	Resolved
2007-07-01	Monitoring and reportingMonitoring, Regular · code 03	Diquatcode 2032	No	Resolved
2007-07-01	Monitoring and reportingMonitoring, Regular · code 03	1,2-Dibromo-3-chloropropane (DBCP)code 2931	No	Resolved
2007-04-01	Monitoring and reportingMonitoring, Regular · code 03	1,2-Dibromo-3-chloropropane (DBCP)code 2931	No	Resolved
2007-04-01	Monitoring and reportingMonitoring, Regular · code 03	Ethylene dibromide (EDB)code 2946	No	Resolved
2007-04-01	Monitoring and reportingMonitoring, Regular · code 03	Diquatcode 2032	No	Resolved
2007-01-01	Monitoring and reportingMonitoring, Regular · code 03	Ethylene dibromide (EDB)code 2946	No	Resolved
2007-01-01	Monitoring and reportingMonitoring, Regular · code 03	1,2-Dibromo-3-chloropropane (DBCP)code 2931	No	Resolved
2007-01-01	Monitoring and reportingMonitoring, Regular · code 03	Diquatcode 2032	No	Resolved

The 12 most recent violations in EPA's records, newest first.Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.

Lakehaven Water and Sewer District: frequently asked questions

Who runs Lakehaven Water and Sewer District?

Lakehaven Water and Sewer District (PWSID WA5341997) is a community water system owned by a local government. It is regulated by the WA state drinking water program.

How many people does Lakehaven Water and Sewer District serve?

Lakehaven Water and Sewer District reports serving 148,809 people through 46,077 service connections in King County, Washington.

Where does Lakehaven Water and Sewer District get its water?

EPA SDWIS lists this system's primary water source as purchased surface water. Purchased surface water means the system buys surface water from another public water system rather than drawing its own.

Does Lakehaven Water and Sewer District have any drinking water violations?

Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in July 2022. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.

Is Lakehaven Water and Sewer District's water safe to drink?

AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in July 2022. For current results, consult the system's annual water quality report, EPA ECHO, or the WA state drinking water program.

Where can I find Lakehaven Water and Sewer District's water quality report?

As a community water system, Lakehaven Water and Sewer District must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.

Other water systems in King County

Water system	County	Population served	Type	Source
Seattle Public Utilities	King	1,161,961	Community	Surface water
Bellevue City of	King	321,349	Community	Purchased surface water
Kent Water Department	King	166,421	Community	Purchased surface water
Redmond Water System City of	King	163,335	Community	Purchased surface water
Renton City of	King	108,091	Community	Groundwater
Auburn City of	King	107,655	Community	Groundwater

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About this data

Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.

Cite as: AquaCensus, “Lakehaven Water and Sewer District, PWSID WA5341997, Washington”, https://aquacensus.com/water-systems/washington/lakehaven-water-and-sewer-district-wa5341997 (data as of October 1, 2026).