Greenlight BackflowCertified annual backflow tests for homes and businesses
Got a backflow test notice from your water district? We come to you, test your backflow assembly, and file the compliance paperwork directly with your water district—so you don't have to worry about a thing.
Single Outlet
$55
Double Outlet
$100
Have more outlets?
Have a question?
Pick a date and a morning or afternoon window, and tell us which water district sent your notice. It takes about two minutes, and we’ll email you to confirm your appointment.
A Washington DOH-certified Backflow Assembly Tester comes to you and checks every valve on your backflow assembly.
We file the test report directly with your water district, so there is nothing left for you to do.
A backflow prevention assembly is a valve that stops water from your property, such as water sitting in sprinkler lines or a boiler, from being pulled back into the public drinking water supply when pressure drops. Over time, the springs and seals inside can wear out without any visible sign.
Washington's cross-connection control rule (WAC 246-290-490) requires every backflow assembly to be tested when it is installed and at least once a year after that. Water districts across King and Snohomish County enforce this by mailing an annual test notice. The test must be done by a Backflow Assembly Tester certified by the Washington State Department of Health, and the results have to be reported to your water district.
We test backflow assemblies throughout King County and Snohomish County, Washington.
We file your test report with your water district, including:
A backflow prevention assembly is a valve that keeps water from your property from flowing backward into the public water supply. A backflow test checks that the assembly’s check valves and relief valve still hold under pressure. A typical test takes about 20 to 30 minutes per assembly.
Washington’s cross-connection control rule (WAC 246-290-490) requires water suppliers to make sure backflow assemblies are tested when installed, at least once a year after that, and after any repair or relocation. Your water district enforces this, usually by mailing a notice with a due date.
Backflow assemblies in Washington must be tested by a Backflow Assembly Tester (BAT) certified by the Washington State Department of Health. Every Greenlight test is performed by a DOH-certified BAT.
A single outlet backflow test is $55 and a double outlet backflow test is $100. For three or more outlets, choose Multiple outlets when you request a time, tell us how many, and we’ll send you a quote.
No. We file the test report directly with your water district after the test, so your annual requirement is taken care of.
Not if the assembly is outside and easy to reach. When you request a time, check the box that lets the tester access the property while you are away, and add any gate codes or directions in the notes.
We serve King County and Snohomish County, Washington, including Seattle, Bellevue, Redmond, Kirkland, Bothell, Renton, Kent, Everett, Lynnwood, Edmonds, Mill Creek, Marysville and surrounding cities.
The due date is on the annual notice from your water district. If you can’t find it, check your utility account online or contact your water district.
A failed assembly has to be repaired or replaced and then retested before your water district will consider it compliant. Your district usually sets a deadline for the repair.
You can request a morning window (8 AM to 12 PM), an afternoon window (12 PM to 5 PM), or any time between 8 AM and 5 PM.
Request a time online in about two minutes. We'll handle the test and the paperwork.
Request an Appointment