Backflow Tester Public List

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Short list of local certified test companies

Many companies offer backflow assembly testing services and repair—including plumbing, irrigation, mechanical, fire sprinkler contractors as well as specialty backflow testing companies. NUD does not recommend nor endorse any specific company or tester over another. This randomly-ordered list merely shows companies who have submitted tests and certification information to our office. You may wish to call more than one company to compare services and costs. We recommend getting more than one bid.

Most testers will submit the proper paperwork to NUD on your behalf.  But it is a good idea to keep a copy for your records in the event the test report is not submitted properly. It is the customers responsibility to ensure that the test report is received by the District. 

If you have any questions about backflow test requirements, please contact our Cross-Connection Office at (425) 654-6321 or

Company / Tester Name

E-Mail / Website


Soundview Landscape & Irrigation 425-487-2180
B.A.T. Master Backflow Service 425-397-0275
French Landscape Irrigation 425-745-8898
Finishing Touches Landscaping 425-485-7758
Available Backflow Testers 425-652-9970
ABC Water Specialty 425-355-9826
Always Testing, Inc. 425-672-4345
Aquasense 425-881-8600
Irrigation Service and Design 425-867-0409
Budget Backflow Testing 425-458-8272
Austin Irrigation, Inc. 425-481-9270
Advanced Irrigation, Inc. 888-833-6220 ext. 3
Grant Utilities 425-449-2072
Turfco Services Inc. 206-634-2461
BATman Testing 206-228-1618
Backflows Northwest 425-277-2888
AWA Backflow 206-369-5660
Mist'er Rain Inc. 425-454-1190
Northern Waters Inc. 425-672-9242
5 Star Backflow Services 425-516-3580
Stop Backflow 425-923-7585
Pops Backflow Testing 206-551-5174
McLaughlin's Backflow Prevention 206-364-9531
Tim's Backflow Testing 425-770-1869
Redwood Backflow 425-495-1939
Panther Backflow Testing 425-231-6360
1st Choice Testing LLC 425-273-3106
Backflow Testing & Service, Inc. 425-334-3350
All Service Backflow 425-584-7166
Certified Backflow Testing, Inc. 888-484-3569
Aardvark Backflow 425-445-5645
Affordable WA Backflow Testing & Repair 360-333-2057
A-BAT (Ron King) 425-334-6423
AACRA Backflow Testing & Repair, Inc. 360-668-1117
Pacific Landscaping 206-366-0913
Prograss 503-682-6076
American Backflow Services 877-950-2468
A+ Backflow 425-830-3749
Affordable Backflow Testers, LLC 206-369-6178
Alpine Sprinklers 425-391-8701
Good Guy Backflow Testing & Repair 425-516-7739
A.R Brown Backflow Testing 206-818-6549
Backflow Systems, LLC 425-569-9252 
Batgirl Backflow Testing, LLC 206-948-0484