Is Stanwood, WA tap water safe?
The short answer
None of the 6 utilities serving Stanwood 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 Stanwood Water Dept, which serves the most people here, has 2 results above the health goal. The worst: Arsenic at 8.5 ppb, above the health goal. Health goals are stricter than legal limits and are not enforced.
The water from City of Stanwood Water Dept is moderately hard to very hard depending on the source, 106 to 222 mg/L (6.2 to 13 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 Stanwood’s ZIP codes, from EPA’s estimates.
- Open report
City of Stanwood Water Dept
Washington · serves 17,586 people · about 390 in Stanwood
2 results above the health goal. The worst: Arsenic at 8.5 ppb, above the health goal. Hardness: moderately hard to very hard depending on the source, 106 to 222 mg/L (6.2 to 13 grains per gallon).
No health-based violations since 2016
- Open report
Seven Lakes Water Association
Washington · serves 5,823 people · about 180 in Stanwood
2 results above the health goal. The worst: Arsenic at 7.7 ppb, above the health goal. Hardness: moderately hard, typically 81 mg/L (4.7 grains per gallon).
No health-based violations since 2016
- Open report
Sno PUD 1 - Warm Beach
Washington · serves 2,977 people · under 100 in Stanwood
2 results above the health goal. The worst: Arsenic at 1.5 ppb, above the health goal. Hardness: soft to moderately hard depending on the source, 53 to 115 mg/L (3.1 to 6.7 grains per gallon).
No health-based violations since 2016
- Open report
Sno PUD 1 - Sunday Lake
Washington · serves 561 people · under 100 in Stanwood
2 results above the health goal. The worst: Arsenic at 6.9 ppb, above the health goal. Hardness: moderately hard, 81 mg/L (4.7 grains per gallon).
No health-based violations since 2016
- Open report
Wilderness Ridge Community Club
Washington · serves 664 people · under 100 in Stanwood
1 result above the health goal. The worst: Arsenic at 7.6 ppb, above the health goal.
No health-based violations since 2016
- Open report
Tatoosh Water Company
Washington · serves 387 people · under 100 in Stanwood
2 results above the health goal. The worst: Arsenic at 1.0 ppb, above the health goal. Hardness: moderately hard, 74 mg/L (4.3 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 City of Stanwood Water Dept’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 Stanwood
The 3 labs Washington certifies closest to Stanwood, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
Precision Analytical Laboratories, LLC
Everett, WA · about 15 miles
Certified for lead and copper, metals, minerals and other inorganics
Freshwater Analytical Labs, LLC
Arlington, WA · about 17 miles
Certified for bacteria
Everett Environmental Laboratory
Everett, WA · about 17 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics
ZIP codes in Stanwood
Which ZIP codes are in Stanwood: 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 Stanwood
Other towns in Snohomish County with a page of their own.
What to do next
- Read City of Stanwood Water Dept’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