Backflow Assembly Testers

As a Backflow Assembly Tester (BAT) you are a vital layer of the multi-layered method of keeping the public drinking water system safe from contamination through backflow prevention. The district appreciates your professional work and depends on you to submit accurate information in a timely manner. Several links to help you submit the necessary information may be found below.

New Testers

All new testers must submit an application to be added to the approved Marin Municipal Water District Testers List. The link to the application can be found on the right side of this page. The application must be submitted by email along with all current Certifications and Gauge Verifications. After review of your documents, we will process your application and schedule a hands-on demonstration held bi-annually in April and October.


Online Test Report

You may submit an online test report here.
Security and Freeze Protection
Click here to view ideas for protecting backflow devices from theft and weather.
Fiberglass Enclosure for Backflow Device