King County Water District #49

Published drinking-water records and contacts for King County Water District #49. System WA5339800. Review sources and dates; not a real-time water assessment.

System ID: WA5339800
State or territory: WA
Published population served: 23492
System type (source code): CWS

Published records and dates

PFAS / lithium (EPA UCMR 5): 120 — 2023-02-15 – 2023-11-06
Washington DOH PFAS test results: 108 — 2023-02-15 – 2023-11-06

Missing records here do not mean the provider did not test. Published records are not a real-time assessment of your tap water.

Published testing results

Selected recent records are shown below. Different sampling locations and dates are not interchangeable. These excerpts are not a complete testing history.

“<” means below the stated reporting limit, not zero. A reported measurement alone is not a safety verdict. Read an example

EPA UCMR 5 — most recent imported sample per substance
Substance	Published result	Reporting limit	Sample date	Sampling location
11Cl-PF3OUdS	< 0.005 µg/L	0.005 µg/L	2023-11-06	Station 142 / EP001
4:2 FTS	< 0.003 µg/L	0.003 µg/L	2023-11-06	Station 142 / EP001
6:2 FTS	< 0.005 µg/L	0.005 µg/L	2023-11-06	Station 142 / EP001
8:2 FTS	< 0.005 µg/L	0.005 µg/L	2023-11-06	Station 142 / EP001
9Cl-PF3ONS	< 0.002 µg/L	0.002 µg/L	2023-11-06	Station 142 / EP001
ADONA	< 0.003 µg/L	0.003 µg/L	2023-11-06	Station 142 / EP001
HFPO-DA	< 0.005 µg/L	0.005 µg/L	2023-11-06	Station 142 / EP001
NEtFOSAA	< 0.005 µg/L	0.005 µg/L	2023-11-06	Station 142 / EP001
NFDHA	< 0.02 µg/L	0.02 µg/L	2023-11-06	Station 142 / EP001
NMeFOSAA	< 0.006 µg/L	0.006 µg/L	2023-11-06	Station 142 / EP001
PFBA	< 0.005 µg/L	0.005 µg/L	2023-11-06	Station 142 / EP001
PFBS	< 0.003 µg/L	0.003 µg/L	2023-11-06	Station 142 / EP001
PFDA	< 0.003 µg/L	0.003 µg/L	2023-11-06	Station 142 / EP001
PFDoA	< 0.003 µg/L	0.003 µg/L	2023-11-06	Station 142 / EP001
PFEESA	< 0.003 µg/L	0.003 µg/L	2023-11-06	Station 142 / EP001
PFHpA	< 0.003 µg/L	0.003 µg/L	2023-11-06	Station 142 / EP001
PFHpS	< 0.003 µg/L	0.003 µg/L	2023-11-06	Station 142 / EP001
PFHxA	< 0.003 µg/L	0.003 µg/L	2023-11-06	Station 142 / EP001
PFHxS	< 0.003 µg/L	0.003 µg/L	2023-11-06	Station 142 / EP001
PFMBA	< 0.003 µg/L	0.003 µg/L	2023-11-06	Station 142 / EP001
PFMPA	< 0.004 µg/L	0.004 µg/L	2023-11-06	Station 142 / EP001
PFNA	< 0.004 µg/L	0.004 µg/L	2023-11-06	Station 142 / EP001
PFOA	< 0.004 µg/L	0.004 µg/L	2023-11-06	Station 142 / EP001
PFOS	< 0.004 µg/L	0.004 µg/L	2023-11-06	Station 142 / EP001
PFPeA	< 0.003 µg/L	0.003 µg/L	2023-11-06	Station 142 / EP001
PFPeS	< 0.004 µg/L	0.004 µg/L	2023-11-06	Station 142 / EP001
PFTA	< 0.008 µg/L	0.008 µg/L	2023-11-06	Station 142 / EP001
PFTrDA	< 0.007 µg/L	0.007 µg/L	2023-11-06	Station 142 / EP001
PFUnA	< 0.002 µg/L	0.002 µg/L	2023-11-06	Station 142 / EP001
lithium	< 9 µg/L	9 µg/L	2023-11-06	Station 142 / EP001

Download all EPA UCMR 5 records (CSV)

Twelve most recent imported state laboratory records
Substance	Published result	Sample date	Location / source
PFEESA	Below a limit; numeric threshold unavailable ng/L	2023-11-06	01 / Washington DOH PFAS test results
PFTrDA	Below a limit; numeric threshold unavailable ng/L	2023-11-06	01 / Washington DOH PFAS test results
NMeFOSAA	Below a limit; numeric threshold unavailable ng/L	2023-11-06	01 / Washington DOH PFAS test results
PFOS	Below a limit; numeric threshold unavailable ng/L	2023-11-06	01 / Washington DOH PFAS test results
PFBA	Below a limit; numeric threshold unavailable ng/L	2023-11-06	01 / Washington DOH PFAS test results
NEtFOSAA	Below a limit; numeric threshold unavailable ng/L	2023-11-06	01 / Washington DOH PFAS test results
PFDoA	Below a limit; numeric threshold unavailable ng/L	2023-11-06	01 / Washington DOH PFAS test results
PFDA	Below a limit; numeric threshold unavailable ng/L	2023-11-06	01 / Washington DOH PFAS test results
PFOA	Below a limit; numeric threshold unavailable ng/L	2023-11-06	01 / Washington DOH PFAS test results
PFHxA	Below a limit; numeric threshold unavailable ng/L	2023-11-06	01 / Washington DOH PFAS test results
PFHpS	Below a limit; numeric threshold unavailable ng/L	2023-11-06	01 / Washington DOH PFAS test results
9Cl-PF3ONS	Below a limit; numeric threshold unavailable ng/L	2023-11-06	01 / Washington DOH PFAS test results

State sampling points can include untreated water. Publisher qualifiers and units are retained; consult the full source notes before interpreting a record.

Download state records with source notes (CSV)

Published compliance history

3 imported records. Status is as recorded in the source; historical records are not current advisories. Missing records do not establish that no violations occurred.

Twenty most recent imported compliance records
Rule / record	Period	Recorded status	Health-based (EPA classification)	Source quarter
Consumer Confidence Rule / Consumer Confidence Report Complete Failure to Report	2017-07-01 – —	Resolved	No	2026Q3
Total Coliform Rule / Maximum Contaminant Level Violation, Monthly (TCR)	1992-02-01 – 1992-02-29	Archived	Yes	2026Q3
Total Coliform Rule / Monitoring, Repeat Major (TCR)	1991-12-01 – 1991-12-31	Archived	No	2026Q3

Source dates and refresh checks

A refresh check is not a sample date. Publication periods, sample dates and checks are shown separately.

EPA SDWIS lead/copper summaries and service areas — source period: — – —; last checked: 2026-10-17
EPA SDWIS contacts and compliance records — source period: — – —; last checked: 2026-10-17
EPA UCMR 5 sample results — source period: 2023-01-03 – 2026-06-17; last checked: 2026-10-17
Washington DOH PFAS test results — last successful check: 2026-10-13

An administrative filing contact may not be a customer-service line. Confirm current contact details with the provider.

Official state resources · How to read these records