Is Hobart, WA tap water safe?
The short answer
None of the 6 utilities serving Hobart has a result above a legal limit or action level, or a health-based violation since 2016, in EPA’s and Washington’s records.
Covington Water District, which serves the most people here, has 1 result above EPA’s new limit, which takes effect in 2029 and 1 result above the health goal. The worst: PFOS at 8.6 ppt, above EPA’s new limit, which takes effect in 2029.
The water from Covington Water District is soft, 25 mg/L (1.5 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 Hobart’s ZIP codes, from EPA’s estimates.
- Open report
Covington Water District
Washington · serves 56,172 people · about 5,700 in Hobart
1 result above EPA’s new limit, which takes effect in 2029 and 1 result above the health goal. The worst: PFOS at 8.6 ppt, above EPA’s new limit, which takes effect in 2029. Hardness: soft, 25 mg/L (1.5 grains per gallon).
No health-based violations since 2016
- Open report
Cedar River Water & Sewer District
Washington · serves 28,671 people · about 4,100 in Hobart
1 result above the health goal. The worst: Arsenic at 3.4 ppb, above the health goal.
No health-based violations since 2016
- Open report
Issaquah Water System
Washington · serves 43,584 people · about 350 in Hobart
2 results above the health goal. The worst: Arsenic at 2.7 ppb, above the health goal. Hardness: soft to moderately hard depending on the source, 58 to 93 mg/L (3.4 to 5.4 grains per gallon).
No health-based violations since 2016
- Open report
City of Bellevue
Washington · serves 321,349 people · under 100 in Hobart
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
Mirrormont
Washington · serves 2,083 people · under 100 in Hobart
2 results above the health goal. The worst: Lead at 1.5 ppb, above the health goal. Hardness: soft to moderately hard depending on the source, 52 to 87 mg/L (3 to 5.1 grains per gallon).
No health-based violations since 2016
- Open report
King County Water District No 90
Washington · serves 20,100 people · under 100 in Hobart
2 results above the health goal. The worst: Arsenic at 4.3 ppb, above the health goal. Hardness: moderately hard, 75 mg/L (4.4 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 Covington Water District’s water, which serves the most people here. Another utility’s report names what handles its own results.
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ZeroWater 10 Cup Pitcher (ZP-010)
Pitcher
- IAPMO listing:NSF/ANSI 42NSF/ANSI 53checked Oct. 4, 2026
Certified for: PFOS, Lead
Aquasana Claryum Direct Connect (AQ-MF-1)
Under-sink carbon
- IAPMO listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 401checked Oct. 16, 2026
Certified for: PFOS, Lead
Express Water StreamLine Direct Connect System (USC001)
Under-sink carbon
- IAPMO listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 401checked Oct. 16, 2026
Certified for: PFOS, Lead
Water testing near Hobart
The 3 labs Washington certifies closest to Hobart, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
Aqua Test, Incorporated
Maple Valley, WA · about 3 miles
Certified for bacteria, nitrate
AmTest Laboratories
Renton, WA · about 11 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics, disinfection byproducts
Analytical Resources, LLC
Tukwila, WA · about 15 miles
Certified for nitrate, lead and copper, metals, minerals and other inorganics
Which ZIP codes are in Hobart: 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 Hobart
Other towns in King County with a page of their own.
What to do next
- Read Covington Water District’s full reportEvery result with its dates, the violations, and the certification claim that handles each finding.Open the report
- Filters for PFOSRanked by certification and what they cost over five years.The best water filters for PFAS, ranked
- On a private well?No utility tests a well. A certified lab test is the first step.How to test well water