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Tap water quality report

Alderwood Water District

EPA monitoring tested this supplier for 44 contaminants and detected 8. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

44
contaminants tested
8
detected
245,715
people served
0
health-based violations
Washington rankingsLead in WashingtonPFAS in Washington
Water source
SWP
Ownership
Local government
Counties served
Snohomish

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.

0
health-based violations
5
violations on file
0
still open
ViolationTypeStatusPeriod
MR Monitoring Archived 1992-12-01 → 1992-12-31
MR Monitoring Archived 1992-11-01 → 1992-11-30
MR Monitoring Archived 1992-10-01 → 1992-10-31
MR Monitoring Archived 1992-08-01 → 1992-08-31
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
54.66 µg/L 68%
of the EPA limit 80 µg/L
worst single sample: 78.5 µg/L
245/245 SYR4 2012–2019
Chloroform
52.54 µg/L
No EPA limit set
worst single sample: 75.4 µg/L
243/243 SYR4 2012–2019
Dichloroacetic Acid
16.21 µg/L
No EPA limit set
worst single sample: 19.1 µg/L
240/240 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
40.61 µg/L 68%
of the EPA limit 60 µg/L
worst single sample: 44.7 µg/L
240/240 SYR4 2012–2019
Trichloroacetic Acid
24.76 µg/L
No EPA limit set
worst single sample: 27 µg/L
223/223 SYR4 2012–2019
Bromodichloromethane
2.6 µg/L
No EPA limit set
worst single sample: 3.3 µg/L
150/150 SYR4 2012–2019
Monochloroacetic Acid
3.335 µg/L
No EPA limit set
worst single sample: 3.6 µg/L
34/243 SYR4 2012–2019
Lead
0.0280 mg/L 187%
above the EPA limit of 0.0150 mg/L
 1/1 LCR 1992
36 contaminants tested, none detected
11Cl-PF3OUdS4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaBromoformCopperDibromoacetic AcidDibromochloromethaneHfpo-DaLeadMonobromoacetic AcidNetfosaaNfdhaNmefosaaPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaLithium

Utility contact

Contact
Heather Earnheart

Frequently asked questions about Alderwood Water District

Is Alderwood Water District tap water safe to drink?

EPA monitoring detected 8 contaminants in Alderwood Water District'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 Alderwood Water District's water?

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

How many people does Alderwood Water District serve?

Alderwood Water District reports serving 245,715 people in Washington, per its EPA record.

Has Alderwood Water District had any water quality violations?

The EPA has 5 violations on file for Alderwood Water District, of which 0 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.