District Headquarters

50 Elm St., Dedham, MA 02026

During Office Hours:

781-329-7090

After Hours Emergency:

781-326-1250

Hydrant Sensors for System Leak Detection

Overview

In 2024, approximately 100 AFLX hydrant sensors were installed as a pilot study to evaluate their effectiveness in detecting system leaks. Over the course of that year,  leaks were detected, and the value of these sensors became clear.

In March 2025, the District received a $42,075 Drought Resiliency and Water Efficiency Grant from the Healey-Driscoll Administration’s Executive Office of Energy and Environmental Affairs to expand on leak detection monitoring across the District’s distribution pipes in Dedham and Westwood.

With the grant funds, an additional 550 sensors were purchased and installed, allowing for the monitoring of the district’s distribution system.

It is anticipated that the sensors will reduce the percentage of produced water that is lost or unaccounted for and decrease the time it takes to discover a leak from months to weeks. The technology can potentially reduce the number of emergency breaks and inform planned excavations during daylight and regular business hours. This has implications of potentially increasing safety for workers and reducing the length of service disruptions.

 

IMAGE OF A YELLOW DWWD FIRE HYDRANT WITH A HYDRANT SENSOR.

How Do the Sensors Work?

Sensors are permanently affixed to hydrants. They work by sensing vibrations in the underground pipe network at night, when water consumption is at its lowest. The District uploads data from the devices monthly to an AI platform that automatically compares vibrations at multiple locations to pinpoint the location of suspected leaks.