WAC 173-50: Accreditation of Environmental Laboratories

Ecology proposes to amend WAC 173-50 Accreditation of Environmental Laboratories for clarity and consistency. We also propose to update our fee structure to adjust for inflation and for the increase in complexity and workload since the last rulemaking in 2010.

Our goal is for the Laboratory Accreditation Unit (LAU) to become cost-neutral while still providing excellent service to environmental laboratories and protection to the public. The current fees do not cover the work needed to process complicated, prolonged, nor unsuccessful applications.

Rule revisions will allow adaptation to new and emerging compounds and analytical processes. In the past 12 years, novel compounds have been added to the regulatory environment. Other analytes now have lower detection requirements. 

Without updates to LAU funding, it will continue to be a challenge to provide the level of service our clients expect.

Rulemaking timeline


Announcement phase (CR-101)

Filing date:
Oct. 10, 2022

Announcement documents

Rule development phase

Oct. 10, 2022 – Jan. 2023

Public input & involvement

Rule Development Documents:

Informal public comment period — Nov. 2, 2022, to Jan. 4, 2023

Comment online.



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To request ADA accommodation for disabilities, or printed materials in a format for the visually impaired, contact Ecology's ADA Coordinator by email at ecyadacoordinator@ecy.wa.gov, or call 360-407-6831. People with impaired hearing may call Washington Relay Service at 711. People with speech disability may call TTY at 877-833-6341.