Backflow Prevention Assembly Testing in Progress

(Posted April 18, 2023) Backflow prevention assembly testing is being performed between April 1 and September 1 on residential and commercial services in the North Marin Water District. The testing is being performed by third party certified backflow testers contracted by the District. These contractors can show a District ID upon request. For any questions regarding the District backflow prevention program, please contact the backflow department at 415-761-8947 or