After we process and deliver clean drinking water to your home, your household may pose water quality risks as a result of what is called backflow.
Cross-connections, a temporary or permanent location between public drinking water and a consumer's water system, could potentially introduce contamination or pollution into the public or private drinking water system.
Irrigation systems, hose bibs, boilers, radiant heat systems, wells, docks, ponds, fountains, pressure boosting systems, pools, spas, graywater systems, rain water collection systems, reclaimed water, and solar heating systems are just a few examples of hazards that need to have backflow protection.
Backflow Preventers Protect Water Quality
The installation of a backflow preventer will protect drinking water systems from possible contamination.
There are four different types of assemblies. If the district has done a survey of your residence or business you will receive a letter letting you know which type of assembly is best suited for you and the location of where it must be installed. There are many brands to choose from, but your assembly must be on Marin Water's list of approved backflow assemblies found here.
Having a backflow preventer installed at your meter only protects the public water system. There may be unprotected cross-connection issues within your property. You may email us at Backflow@MarinWater.org if you have any questions or call 415.945.1488. Or you may refer to our List of Certified Testers to find a cross-connection specialist that can meet with you and conduct an in-depth survey of your home or business.
Scheduling annual inspections is required in order to ensure the public drinking water system is protected from possible contaminants. A visual inspection of an air gap is sufficient, but backflow assemblies must be tested by a Certified Backflow Prevention Assembly Tester using a properly calibrated gauge.
Backflow Assembly Testers
Backflow Assembly Testers (BATs) play a vital role of keeping the public drinking water system safe and clean by preventing backflow. As a backflow assembly tester, the water district relies on you to submit accurate information in a timely manner.
All new testers must submit an online application in order to be added to the approved Marin Water Testers List. After submitting the application, please scan and email copies of current Certifications and Gauge Verification to Backflow@MarinWater.org. After we have received all the documents, we will process the application and schedule a hands-on demonstration, held in April and October.
Online Test Report
Submit an online test report here.
For more information, please email us at Backflow@MarinWater.org or call 415.945.1488.