District Headquarters

50 Elm St, Dedham, MA 02026

During Office Hours:

781-329-7090

After Hours Emergency:

781-326-1250

Cross Connection Control Program

Cross Connection Control Program and Backflow Prevention

What is a Cross Connection and What can I do about it?
A cross connection is a connection between a drinking water pipe and a polluted source. The pollution can come from your own home. For instance, you’re going to spray fertilizer on your lawn. You hook up your hose to the sprayer that contains the fertilizer. If the water pressure drops at the same time you turn on the hose, the fertilizer may be sucked back into the drinking water pipes through the hose. This problem can be prevented by using an attachment on your hose called a backflow-prevention device.

The Dedham-Westwood Water District recommends the installation of backflow prevention devices, such as a low cost hose bib vacuum breaker, for all inside and outside hose connections. You can purchase this at a hardware store or plumbing supply store. This is a great way for you to help protect the water in your home as well as the drinking water system in your town! For additional information on cross connections and on the status of your water systems cross connection program, please contact Stephanie Costa at our office.

Dedham-Westwood Water District’s  Cross Connection Control Program, as mandated by the Department of Environmental Protection, is a key element of the Water System operation.  Dedham-Westwood Water District is committed to protecting your public water system from contamination due to backflow or backsiphonage of connections containing non-potable water.

Backpressure and cross contamination can occur when the pressure in equipment or a system is greater than the pressure in the drinking water system. Contamination can also occur when the pressure in the drinking water line drops due to occurrences such as main breaks and heavy water demand causing contaminants to be drawn out from equipment and into the drinking water system.

Dedham-Westwood Water district’s water system is protected by the control of actual or potential cross connections through two programs:

Every six months, as required by Massachusetts Drinking Water Regulations, the Water Division performs backflow device testing as a fee for service program. Devices are tested and a report is given to the property owner.  Follow up tests are performed if the device failed the initial test. Repairs to backflow preventers are repaired by independent firms at the owner’s expense. Reporting and management of survey and testing reports is the responsibility of Town of Dedham-Westwood Water District. Conditions of the systems are reported to the Mass DEP.

Common Sources of Cross Connections

Outside water taps and garden hoses tend to be the most common sources of cross-connection contamination at home. The garden hose creates a hazard when submerged in a swimming pool or when attached to a chemical sprayer for weed killing or fertilizer application. Water suppliers are required to survey all industrial, commercial and institutional and municipal facilities to ensure all cross connections are identified and eliminated or protected by an appropriate device.

Forms required for approval of Cross Connection and Backflow Preventor devices:

COMING SOON (PDF)

Don't Hesitate to Contact Us If You Have Any Questions!

Our employees strive to meet a high standard of service to our customers. We always welcome your input and suggestions for how to serve you.

There will be a Board of Water Commissioners Special Business Meeting on Thursday June 30, 2022 at 6:30 PM.  This meeting will be virtual only. Please see the agenda page, which is posted when available, for more information including exemptions for executive session and joining instructions.
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