Many plumbers have at one time had training in Backflow Assembly Testing, as it is included in 3rd year plumbing education. However, since most provinces in Canada require that certified backflow testers must renew their certification each year, many plumbers let their certification lapse and are thus not qualified to submit tests to the municipal water authorities and purveyors that require backflow assembly testing.nnIn the Vancouver Lower Mainland (Abbotsford, Chilliwack, Hope, Mission, New Westminster, North Vancouver, Richmond, Vancouver, Whistler) and throughout BC a “certified backflow assembly tester” is a person who has been certified by the BC Water and Waste Association (BCWWA) as a Certified Backflow Assembly Tester; has received formal training in backflow testing; and has renewed their BCWWA certification each year.