What is a cross-connection?

Cross Connections

Cross connections that contaminate drinking water distribution lines are a major concern. A cross connection is formed at any point where a drink water line connects to a equipment (boilers), systems containing chemicals (air conditioning systems, fire sprinklers systems, irrigation systems), or water sources of questionable quality. 


Cross connection contamination can occur when the pressure in the equipment or system is greater than the pressure inside the drinking water line (back pressure). Contamination can also occur when the pressure in the drinking water line drops due to fairly routine occurrences (main breaks, heavy water demands) causing contaminants to be sucked out from the equipment and into the drinking water line (backsiphonage).

Water Taps

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 control. Garden hoses that are left lying on the ground may be contaminated by fertilizers, cesspools, or garden chemicals.

Community Water Supplies

Community water supplies are continuously jeopardized by cross connections unless appropriate valves, known as backflow prevention devices, are installed and maintained. We survey all industrial and commercial facilities in our town to make sure that all potential cross-connections have been identified and eliminated or properly protected by a backflow prevention device. We also inspect and test each back flow preventer to make sure that it is providing maximum protection. Please be cognizant of potential cross connections and support the Town in preventing contamination of our distribution system.

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1. How do I check for leaks?
2. Why is my bill estimated?
3. Do we offer a senior discount?
4. I am buying / selling property. What should I do?
5. What is the procedure to tie into Town water?
6. I will temporarily be away. What should I do?
7. How do I read my water meter?
8. Can I obtain a bill history or a duplicate bill for my account?
9. How do I prevent my pipes from freezing?
10. Why do we flush the fire hydrants?
11. What is a cross-connection?