Is Buena, WA tap water safe?
The short answer
1 of the 2 utilities serving Buena 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 Zillah.
Yak Co - Buena Water System, which serves the most people here, has 1 result above the health goal. The worst: Arsenic at 1.6 ppb, above the health goal. Health goals are stricter than legal limits and are not enforced.
The water from Yak Co - Buena Water System is very hard, 187 mg/L (10.9 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 Buena’s ZIP codes, from EPA’s estimates.
- Open report
Yak Co - Buena Water System
Washington · serves 952 people · about 540 in Buena
1 result above the health goal. The worst: Arsenic at 1.6 ppb, above the health goal. Hardness: very hard, 187 mg/L (10.9 grains per gallon).
No health-based violations since 2016
- Open report
City of Zillah
Washington · serves 3,518 people · under 100 in Buena
1 result above the health goal. The worst: Arsenic at 3.0 ppb, above the health goal. Hardness: very hard, typically 218 mg/L (12.7 grains per gallon).
1 health-based violation since 2016
What handles it
Each of these is certified, on a certifier’s listing, for a result above a line in Yak Co - Buena Water System’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 Buena
The 3 labs Washington certifies closest to Buena, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
Anatek Labs, Inc. - Yakima
Yakima, WA · about 25 miles
Certified for bacteria, nitrate, minerals and other inorganics
LabTest
Yakima, WA · about 25 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics
Ag Health Laboratories, Inc.
Sunnyside, WA · about 31 miles
Certified for bacteria, nitrate
Which ZIP codes are in Buena: 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 Buena
Other towns in Yakima County with a page of their own.
What to do next
- Read Yak Co - Buena Water System’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