Environmental laboratory accreditation

Environmental laboratories that analyze environmental samples and monitoring data in Washington must receive accreditation through Ecology to ensure they are conducting analyses according to prescribed methods. They must be capable of providing accurate and defensible analytical data. Many grant-based or legislatively-mandated scientific studies require the use of an accredited laboratory.

Our laboratory accreditation staff offers guidance on how to apply to become an accredited lab. We also assist labs with quality control. We maintain the Lab Search database for finding environmental labs, including those that test drinking water and wastewater.

Four erlenmyer flasks of liquid sit on stirring apparatuses. A scientist's hands and the front of her lab coat are seen. She is adding something to the mixture in the first flask.

Find a lab

  • Lab Search database — Find an accredited lab. Search by area, environmental parameter (analytes), and more. A printable list (PDF, below) of accredited labs is available, however, the most up-to-date information is in the Lab Search database, above.
  • How to choose an analytical laboratory offers considerations to keep in mind when deciding which lab to hire for your analyses.

All Accredited Labs by Name | Drinking Water by County | Drinking Water Labs with All Analyses

Become an accredited lab

News and resources for labs

The latest news on manuals, procedures, methods, and other accreditation topics and procedures for accredited laboratories is available on this page.

Renew accreditation

Environmental labs are notified six weeks before accreditation expires, with a renewal application and a report of the lab's currently requested parameters. To assure accreditation renewals are promptly managed, please keep us updated with your current email address, and contact Ella Rae when you are ready to submit your completed renewal application or if you do not receive a renewal application.

To ensure you receive renewal notices, please add "donotreply@ecy.wa.gov" to your contact list.