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Tester List
 Company  Phone  Location
 AACRA Backflow Assembly Testing  360-668-1117 Woodinville
 A-Bat Backflow Assembly Testing  425-334-6423 Everett
 ABC Water Specialty Inc  425-335-9826 Lake Stevens
 Advanced Irrigation Inc  888-833-6220 Pacific
 Affordable Washington Backflow Testing  425-892-4808 Snohomish
 Affordable Backflow Testers  206-369-6178 Renton
 Always Testing Inc  425-672-4345 Mountlake Terrace
 A-Plus  425-830-3749 Kirkland
 Aqua Containment  425-392-1523 Issaquah
 Aquasense  425-881-8600 Redmond
 Auburn Mechanical  253-838-9780 Auburn
 Available Backflow Testers  425-652-9970 Covington
 A Women's Touch  425-333-4934 Carnation
 BATman Testing  206-228-1618 Everett
 Backflows Northwest  425-277-2888 Bellevue
 Backflow Testing & Service  425-334-3350 Lake Stevens
 Bat Master  425-397-0275 Lake Stevens
 Budget Backflow Testing  425-458-8272 Bellevue
 Certified Backflow Testing  425-427-8889 Sammamish
 Combs Backflow Assembly  425-736-4936 Maple Valley
 Dennis McLaughlin's Bacflow  206-364-9531 Seattle
 Fire Chief Equipment  425-641-2127 Redmond
 Froula Alarm Systems  206-575-1962 Tukwila
 Malone's Landscape  253-638-2080 Covington
 McLaughlins Peninsula Backflow  206-890-8337 Seattle
 Mist'er Rain Inc.  425-454-1190 Bellevue
 Mt Si Plumbing/Heating  425-888-0433 North Bend
 Patriot Fire Protection  253-926-2290 Seattle
 Olympic Landscaping And Irrigation Co.  253-922-7075 Puyallup
 R.A. Brown Backflow Testing  425-821-6801 Kirkland
 Redwood Backflow/Aardvark BF  425-495-1939 Redmond
 Rodriguez Irrigation & Backflow Services  425-765-6231 Issaquah
 Veteran Backflow Service  253-792-9400 Seattle
 Winterbourne Landscape  425-836-5193 Redmond