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Tap water quality report

King County Water District #49

EPA monitoring tested this supplier for 41 contaminants and detected 10. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

41
contaminants tested
10
detected
23,492
people served
3
health-based violations
Washington rankingsLead in WashingtonPFAS in Washington
Water source
SWP
Ownership
Local government
Counties served
King

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

3
health-based violations
9
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Archived 1992-02-01 → 1992-02-29
MCL Health-based Archived 1992-02-01 → 1992-02-29
MCL Health-based Archived 1992-02-01 → 1992-02-29
Other Monitoring Resolved 2017-07-01
Other Monitoring Resolved 2015-07-01
Other Monitoring Resolved 2014-07-01
Other Monitoring Resolved 2012-07-01
Other Monitoring Resolved 2011-07-01
MR Monitoring Archived 1991-12-01 → 1991-12-31

Other contaminants detected

Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the 95th percentile of this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
TTHM
46.643 µg/L 58%
of the EPA limit 80 µg/L
worst single sample: 55.3 µg/L
120/120 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
39.0525 µg/L 65%
of the EPA limit 60 µg/L
worst single sample: 49.5 µg/L
120/120 SYR4 2012–2019
Dichloroacetic Acid
16.41 µg/L
No EPA limit set
worst single sample: 21.2 µg/L
119/119 SYR4 2012–2019
Trichloroacetic Acid
24.25 µg/L
No EPA limit set
worst single sample: 32.5 µg/L
119/119 SYR4 2012–2019
Chloroform
43.07 µg/L
No EPA limit set
worst single sample: 53.4 µg/L
118/118 SYR4 2012–2019
Bromodichloromethane
4.531 µg/L
No EPA limit set
worst single sample: 6.46 µg/L
107/107 SYR4 2012–2019
Monochloroacetic Acid
2.834 µg/L
No EPA limit set
worst single sample: 3.15 µg/L
35/119 SYR4 2012–2019
Dibromochloromethane
4.72 µg/L
No EPA limit set
worst single sample: 4.89 µg/L
18/120 SYR4 2012–2019
Bromoform
1.3845 µg/L
No EPA limit set
worst single sample: 1.43 µg/L
8/120 SYR4 2012–2019
Dibromoacetic Acid
1.3285 µg/L
No EPA limit set
worst single sample: 1.36 µg/L
8/120 SYR4 2012–2019
31 contaminants tested, none detected
11Cl-PF3OUdS4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaHfpo-DaMonobromoacetic AcidNetfosaaNfdhaNmefosaaPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaLithium

Utility contact

Contact
Jorgan Peadon

Frequently asked questions about King County Water District #49

Is King County Water District #49 tap water safe to drink?

EPA monitoring detected 10 contaminants in King County Water District #49's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in King County Water District #49's water?

EPA monitoring detected TTHM, Total Haloacetic Acids (HAA5), Dichloroacetic Acid, Trichloroacetic Acid, Chloroform, and others. The full list with the level and data source for each is above.

How many people does King County Water District #49 serve?

King County Water District #49 reports serving 23,492 people in Washington, per its EPA record.

Has King County Water District #49 had any water quality violations?

The EPA has 9 violations on file for King County Water District #49, of which 3 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.