Public Health Laboratories

The Washington State Public Health Laboratories (PHL) provides diagnostic and analytical services for the assessment and surveillance of infectious, communicable, genetic, and chronic diseases and environmental health concerns.

Directory of Services

Learn about the entire laboratories and services in the Directory of Services (PDF, 78 pages, 3.5 MB).

Directory of Services brochure

Or, take a quick view of services in our brochure (PDF).

Lab services brochure

Address and Phone Number

Telephone: 206-418-5400
Fax: 206-367-1790 *DO NOT send patient information to this number - it is not a secure line.
1610 NE 150th Street
Shoreline, WA 98155

PHL Accreditations and Licenses

California Department of Public Health Clinical and Public Health Laboratory License

California Department of Public Health grants the State of Washington Public Health Laboratories with a Clinical Laboratory License (May 2025)(PDF).

American National Standards Institute (ANSI)

ANAB accreditation logo

The PHL Office of Environmental Laboratory Sciences Environmental and Radiation Chemistry Group is accredited in accordance with the recognized International Standard ISO/IEC 17025:2017.
This accreditation demonstrates technical competence for a defined scope and the operation of a laboratory
quality management system. ANSI Accreditation (PDF)

College of American Pathologists (CAP)

CAP- College of American Pathologists logo

The PHL achieved CAP accreditation. This is a peer-based inspection process that combines regulatory and educational coaching from the world's most respected pathology organization. This process uses the highest standards in pathology and laboratory medicine and applies those standards through the accreditation program.

Letter of CAP Accreditation (PDF)

Department of Ecology

Department of Ecology accreditation award

Full accreditation has been granted to Office of Environmental Laboratory Sciences by Department of Ecology for the analytical parameters listed on the Scope of Accreditation.

Medical Test License

Medical Test Site Accredited License (PDF)

National Shellfish Sanitation Program Accredited Laboratory

The WA PHL accreditation evaluation for the NSSP shellfish testing is performed by the FDA under the National Shellfish Sanitation Program (NSSP) requirements. FDA does not send certificates but places our laboratory on an accredited laboratory list titled “Domestic NSSP Laboratory List. The List can also be found posted online by the ISSC at this site

Next NSSP Accreditation Review – ~September 2025.

NSSP Scope: Evaluated NSSP Methods (Labs in conforming or provisionally conforming status)



  1. Multiple Tube Fermentation Technique for Seawater using MA-1

  1. Mouse Bioassay for Paralytic Shellfish Poisoning (PSP)
  1. Multiple Tube Fermentation Technique for Shellfish Meats (APHA)

  1. Domoic Acid (Amnesic Shellfish Poisoning; ASP) HPLC-UV
  1. Multiple Tube Fermentation Technique for UV treated process water (10 tube, 10 mL portions, single dilution MPN)