Records currently available
Washington record snapshot
These counts describe reviewed records available on Water Quality Lookup. They are not a count of every provider, city, or county in Washington.
Reviewed profiles or limited identity records.
Local entry points, not service-area boundaries.
Guide sources reviewed September 13, 2026.
Cities
Washington city entry points currently available
These Washington city pages are local starting points. City boundaries and water service areas may not match, and more than one provider may serve a city.
Seattle
Start with SEATTLE PUBLIC UTILITIES, then confirm the provider for your address.
Open SeattleSpokane
Start with SPOKANE CITY OF, then confirm the provider for your address.
Open SpokaneTacoma
Start with TACOMA WATER DIVISION CITY OF, then confirm the provider for your address.
Open TacomaWater systems
Washington public water systems currently available
These previews link to reviewed system profiles with identifiers, report-year context, sources, and limitations.
SEATTLE PUBLIC UTILITIES
PWSID WA5377050 · Seattle · Latest reviewed report 2025
View system profileSPOKANE CITY OF
PWSID WA5383100 · Spokane · Latest reviewed report 2025
View system profileTACOMA WATER DIVISION CITY OF
PWSID WA5386800 · Tacoma · Latest reviewed report 2025
View system profileReport context
Start with Washington's available report overviews
The existing Seattle, Spokane and Tacoma profiles include 2025 report context reviewed July 31, 2026. Use the reporting period and sample dates beside each result; this guide's review date does not make those measurements newer.
Seattle · WA5377050
Two watersheds need their own context
Seattle's 2025 report describes supplies from the Cedar River and South Fork Tolt River watersheds. Its water-quality tables separate results for the two sources, so keep the source label with the result.
The report also distinguishes potential watershed contamination from detected contaminants. A source-water assessment is not a measurement at your tap.
Spokane · WA5383100
Use the reviewed report and current utility updates
Spokane's existing profile keeps its reviewed 2025 report overview and source links together. Preserve each result's units, monitoring period and limitations when reading the report.
The official water-quality page also carries PFAS information and service-line guidance. Check that page and contact the provider for updates beyond the historical report.
Tacoma · WA5386800
River water and groundwater play different roles
Tacoma's 2025 report describes the Green River as its main supply, with groundwater used to supplement demand and during periods of river turbidity. The report explains treatment separately for those supplies.
That supply description is specific to Tacoma Water. It does not establish which source reached an individual property or describe all Washington systems.
Continue your Washington lookup
Use the system directory, a plain-language guide, or the methodology page for the next step.
System directory
Washington public water systems
Browse the reviewed system profiles currently available for this state.
Browse systemsLookup guide
How to look up your drinking water system
Start with a utility bill, PWSID, state lookup tool, or official report so you can find the public water system behind a city or provider name.
Read the lookup guideReport guide
How to read a water quality report
A plain-English walkthrough of Consumer Confidence Reports, including report years, detected contaminants, legal limits, violations, and source notes.
Read the report guideData and trust
Sources, methodology, and limitations
See how records are sourced, reviewed, dated, and limited before using a summary.
Review methodologyStatewide context
Choose the right Washington information path
Public-system oversight
Start with the Office of Drinking Water
Washington's Department of Health Office of Drinking Water provides public-system records, regional contacts, source-water information and regulatory guidance. Its contacts page also links to local health departments.
The state drinking-water alerts page specifically covers Group A public water systems. Do not assume that its coverage includes every small supply or household private well.
Record freshness
A posted record can lag the event
Sentry Internet provides public-system summaries, water-quality data, operating permits and compliance information. Its introduction says water-quality results generally take about a week to appear after DOH receives them for quality review.
Check the displayed update date and each result's sample date. A record's absence or a recent website visit cannot establish current water conditions.
Provider confirmation
A city name is a starting point
Use the provider named on your water bill, or ask your landlord or property manager which system supplies the property. Confirm the provider's PWSID before matching a report or notice.
The cities and systems listed here are selected site coverage. Their counts are not Washington's statewide inventory, and a nearby system record does not establish service to an address.
Official lookup
Find a Washington system and keep its identifier
State records
Use Sentry for the record you need
From DOH's Drinking Water System Data page, open Sentry Internet Database. Its navigation separates Find Water Systems, Find Water Quality and Downloads/Reports.
Sentry presents terms and a privacy notice before the system search. We reviewed its public introduction and guidance, but did not complete a search beyond that screen. EPA's drinking-water search provides an alternative identity starting point.
- Confirm the provider name from your bill or provider.
- In EPA's drinking-water search, use System Name or PWSID to narrow the records.
- Match the identifier and name, then confirm address-level service with the provider before choosing a report or notice.
Verified example
Seattle Public Utilities is WA5377050
A September 13 query of EPA's official water-system data returned SEATTLE PUBLIC UTILITIES for WA5377050, matching the existing Seattle profile.
Keep the complete PWSID when comparing records. A matching identity does not prove that a particular property is served, that no notice is active or that every result is current.
Official tools
Use Washington's official tools for the next question
Current notices
Check the state alert list and your provider
DOH's Drinking Water Alerts page lets readers narrow Group A alerts by county or search text. Entries identify the water system, issue date, recommended action and contact information.
Match the named system to your provider and follow the current official instructions. The list is not an address lookup, and an absent result does not establish that no advisory applies. Ask the provider which alert subscriptions cover your location.
Annual reports
Find a report or request another format
Washington's CCR guidance explains annual Consumer Confidence Reports for community water systems. It does not apply the same report requirement to every system category.
Start with your provider's report archive. If the report is missing, the file will not open or you need another format or language, contact the provider and ask what is available.
Lead and service lines
Ask for the material record and testing guidance
Washington's service-line inventory page explains inventory work for water-system operators. Ask your provider how to obtain or clarify the recorded material for both portions of your service line.
Pipe-material records and tap-water tests answer different questions. A non-lead service-line classification does not measure lead in building plumbing or an individual tap sample. DOH's lead page links to water-testing and accredited-laboratory information.
PFAS testing
Match the result to the system and sample date
DOH's household PFAS guidance points public-system customers to the PFAS Testing Results Dashboard and their provider. Use it to investigate whether your system has reported testing and which compounds were measured.
Keep the sampling date, units and reporting limits with any result. A missing dashboard entry is not a zero result, and another system's test does not describe a household private well.
Private wells
Arrange testing before collecting a sample
DOH's Testing Your Water guidance recommends that private-well owners test annually for coliform bacteria and nitrate, with other tests chosen for local conditions and concerns. The well owner is responsible for arranging testing.
Contact a certified laboratory for sampling instructions, available analyses and current fees. Ask your county health or planning department about local requirements, including property-sale testing; a public-system report does not test your well.
Common questions
Read Washington records without losing their limits
Does Sentry show a sample as soon as it is collected?
No. Sentry describes a posting delay after DOH receives results, and the sample itself may be older. Read the collection date and the site's update date separately.
Does the state alert page cover my private well?
The listed scope is Group A public water systems. For a private well, use DOH's well-testing guidance and your local health department; do not treat the absence of a state alert as a test result.
Does a watershed assessment show contamination at my tap?
No. Seattle's report distinguishes potential sources of watershed contamination from detected results. Read the system's measured results and sampling details separately from source-water assessments.
Official sources
Official sources for Washington
Use Washington State Department of Health Office of Drinking Water and the official sources below to verify system identity, record dates, and current notices before relying on a summary.
Statewide sources
Washington records and guidance
PWSID WA5377050 · Sources for this system
Seattle Public Utilities 2025 Drinking Water Quality Report
PWSID WA5383100 · Sources for this system
City of Spokane Water Department 2025 Water Quality Report
PWSID WA5386800 · Sources for this system
Tacoma Water 2025 Water Quality Report
Utility report
Tacoma Water 2025 Water Quality Report (opens official source)
Utility website