Is Cathcart, WA tap water safe?
The short answer
None of the 3 utilities serving Cathcart has a result above a legal limit or action level, or a health-based violation since 2016, in EPA’s and Washington’s records.
Cross Valley Water District, which serves the most people here, has 2 results above the health goal. The worst: Arsenic at 4.7 ppb, above the health goal. Health goals are stricter than legal limits and are not enforced.
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 Cathcart’s ZIP codes, from EPA’s estimates.
- Open report
Cross Valley Water District
Washington · serves 24,695 people · about 1,800 in Cathcart
2 results above the health goal. The worst: Arsenic at 4.7 ppb, above the health goal.
No health-based violations since 2016
- Open report
Silver Lake Water & Sewer District
Washington · serves 65,033 people · about 1,200 in Cathcart
Nothing in its records is above a health goal.
No health-based violations since 2016
- Open report
Aqua Copia/Horse Country Estates
Washington · serves 250 people · under 100 in Cathcart
1 result above the health goal. The worst: Arsenic at 8.1 ppb, above the health goal. Hardness: moderately hard, 119 mg/L (7 grains per gallon).
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 Cross Valley Water District’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, Lead
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, Lead
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, Lead
Water testing near Cathcart
The 3 labs Washington certifies closest to Cathcart, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
Everett Environmental Laboratory
Everett, WA · about 10 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics
OnSite Environmental, Inc.
Redmond, WA · about 11 miles
Certified for lead and copper, metals, minerals and other inorganics
Precision Analytical Laboratories, LLC
Everett, WA · about 12 miles
Certified for lead and copper, metals, minerals and other inorganics
ZIP codes in Cathcart
Which ZIP codes are in Cathcart: 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 Cathcart
Other towns in Snohomish County with a page of their own.
What to do next
- Read Cross Valley Water District’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