Is Warden, WA tap water safe?
The short answer
1 of the 3 utilities serving Warden 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 Warden.
City of Warden, which serves the most people here, has 1 result above the legal limit and 1 result above the health goal. The worst: Nitrate at 12.5 ppm, above the legal limit.
The water from City of Warden is moderately hard to very hard depending on the source, 80 to 220 mg/L (4.7 to 12.9 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 Warden’s ZIP codes, from EPA’s estimates.
- Open report
City of Warden
Washington · serves 4,674 people · under 100 in Warden
1 result above the legal limit and 1 result above the health goal. The worst: Nitrate at 12.5 ppm, above the legal limit. Hardness: moderately hard to very hard depending on the source, 80 to 220 mg/L (4.7 to 12.9 grains per gallon).
1 health-based violation since 2016
- Open report
Warden Hutterian Brethren 1
Washington · serves 171 people · based in Warden
Nothing in its records is above a health goal. Hardness: soft, 58 mg/L (3.4 grains per gallon).
No health-based violations since 2016
- Open report
Sage Hills Estates 1
Washington · serves 38 people · based in Warden
1 result above the limit’s level with no violation recorded. The worst: Arsenic at 11.2 ppb, above the limit’s level, no violation. Hardness: hard, 149 mg/L (8.7 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 City of Warden’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: Nitrate, 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: Nitrate, Arsenic
Culligan 10-Cup Pitcher with ZeroWater Technology (ZEROP10)
Pitcher
- IAPMO listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 401checked Oct. 9, 2026
Certified for: Nitrate
Water testing near Warden
The 3 labs Washington certifies closest to Warden, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
AV Labs, Inc
Othello, WA · about 13 miles
Certified for bacteria
Soiltest Farm Consultants, Inc. Laboratory
Moses Lake, WA · about 16 miles
Certified for nitrate, minerals and other inorganics
Matrix Sciences International Inc. dba KTL
Pasco, WA · about 42 miles
Certified for nitrate, lead and copper, metals, minerals and other inorganics
ZIP codes in Warden
Which ZIP codes are in Warden: 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 Warden
Towns nearby with a page of their own.
What to do next
- Read City of Warden’s full reportEvery result with its dates, the violations, and the certification claim that handles each finding.Open the report
- Filters for NitrateRanked 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