Cross Connection - Certified Testers

The Washington Environmental Training and Resource Center (WETRC) maintains a list of State Certified Backflow Assembly Testers (BATs) who are certified to test in the State of Washington.

Certified testers:

To view a list of certified testers visit WETRC's website. Click on the "Backflow Assembly Tester" button on the top right, then click on the "BAT Public List" to search by county.

Tester certification:

Certified Backflow Testers must have the following:

    • Current Washington State Backflow Assembly Tester (BAT) certification.
    • Current City of Olympia business license.
    • Current verification of gauge accuracy.

Questions about cross connection? Contact Steve Coke, City of Olympia, Public Works Department, at 360.753.8161, or send an scoke@ci.olympia.wa.us.

Need a permit? Contact the City of Olympia Community Planning and Development Department, at 360.753.8314, or send an cpdinfo@ci.olympia.wa.us.

Need related water quality information? Contact the Public Works office.

  • Physical Address: 924 7th Ave. SE, Suite A
  • Mailing Address: PO Box 1967, Olympia, WA 98507
  • Download printer-friendly (PDF) directions to our office
  • Hours: Monday - Friday from 8:00 a.m. to 5:00 p.m.
  • Phone: 360.753.8588
  • Email: publicworks@ci.olympia.wa.us