Environmental Assessment > Laboratory Accreditation

Accreditation of Environmental Laboratories

Accreditation of environmental laboratories ensures a lab is capable of providing accurate and defensible analytical data. The rule governing lab accreditation is Chapter 173-50 Washington Administrative Code and includes accreditation of labs that analyze drinking water.

• How to become accredited and maintain your lab's accreditation
• Procedure Manual - September 2010
• How to obtain a U.S. EPA-assigned Lab Code
• Frequently asked questions
• Search for an accredited lab
• Contacts
• Methods and Analytes Table

Mailing address

Washington State Department of Ecology
Laboratory Accreditation Program
PO Box 488
Manchester, WA
98353-0488

Street address

Washington State Department of Ecology
Laboratory Accreditation Program
2350 Colchester Dr E
Manchester, WA
98353

Main Telephone Number

(360) 895-6145

FAX Number

(360) 895-6180