Is Clyde Hill, WA tap water safe?
The short answer
None of the 3 utilities serving Clyde Hill has a result above a legal limit or action level, or a health-based violation since 2016, in EPA’s and Washington’s records.
City of Bellevue, which serves the most people here, has 1 result above the health goal. The worst: Arsenic at 2.9 ppb, above the health goal. Health goals are stricter than legal limits and are not enforced.
The water from City of Bellevue is soft to moderately hard depending on the source, 47 to 79 mg/L (2.7 to 4.6 grains per gallon). How Washington’s water compares.
A town can be served by more than one utility, and some homes are on private wells. The name on your water bill tells you which is yours, and your ZIP code narrows it down. They are listed by how many people each serves in Clyde Hill’s ZIP codes, from EPA’s estimates.
- Open report
City of Bellevue
Washington · serves 321,349 people · about 5,600 in Clyde Hill
1 result above the health goal. The worst: Arsenic at 2.9 ppb, above the health goal. Hardness: soft to moderately hard depending on the source, 47 to 79 mg/L (2.7 to 4.6 grains per gallon).
No health-based violations since 2016
- Open report
Grandview Condominiums
Washington · serves 679 people · under 100 in Clyde Hill
1 result above the health goal. The worst: Lead at 1.5 ppb, above the health goal.
No health-based violations since 2016
- Open report
Beaux Arts Water Department
Washington · serves 345 people · under 100 in Clyde Hill
2 results above the health goal. The worst: Arsenic at 3.6 ppb, above the health goal.
No health-based violations since 2016
What handles it
Each of these is certified, on a certifier’s listing, for a result above a line in City of Bellevue’s water, which serves the most people here. Another utility’s report names what handles its own results.
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Countertop reverse osmosis
- IAPMO listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 58NSF/ANSI 401checked Oct. 4, 2026
Certified for: Arsenic
Aquasana SmartFlow Reverse Osmosis (AQ-SFRO2)
Under-sink reverse osmosis
- WQA listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 58NSF/ANSI 401checked Oct. 9, 2026
Certified for: Arsenic
Brondell Capella RC250 Reverse Osmosis System
Under-sink reverse osmosis
- WQA listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 58NSF/ANSI 401checked Oct. 9, 2026
Certified for: Arsenic
Water testing near Clyde Hill
The 3 labs Washington certifies closest to Clyde Hill, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
Seattle-King Co Dept of Public Health Lab
Seattle, WA · about 6 miles
Certified for bacteria
OnSite Environmental, Inc.
Redmond, WA · about 6 miles
Certified for lead and copper, metals, minerals and other inorganics
MCL Food Testing
Seattle, WA · about 7 miles
Certified for bacteria
ZIP codes in Clyde Hill
Which ZIP codes are in Clyde Hill: Census 2020 relationship files. Which utilities serve them, and how many people: EPA SDWIS and EPA’s service area map. Each utility’s results: EPA UCMR 5, EPA SDWIS, and EPA’s and the state’s compliance monitoring, as its report lists them. How they are measured: methodology. Certified labs: Washington State Department of Ecology, Lab Accreditation Program, environmental laboratories accredited for drinking water analyses; distances from the Census 2020 ZIP code tabulation area gazetteer.
Near Clyde Hill
Other towns in King County with a page of their own.
What to do next
- Read City of Bellevue’s full reportEvery result with its dates, the violations, and the certification claim that handles each finding.Open the report
- Filters for ArsenicRanked by certification and what they cost over five years.The best reverse osmosis systems, ranked
- On a private well?No utility tests a well. A certified lab test is the first step.How to test well water