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Backflow Prevention

The purpose of the Backflow Prevention Program is to ensure that there is no possible contamination of your drinking water due to improper plumbing interconnections.Backflow Prevention  Examples of potential cross connections are commercial boilers, a chemical storage plant or a residential property with an irrigation system. The backflow device is a mechanical valve that senses a flow reversal and stops possibly harmful water from mixing with the drinking water.

The program is mandated by the U.S. Environmental Protection Agency and the N.H. Department of Environmental Services. There are approximately 6,000 backflow devices in the MWW system and about 90 percent of these are located in commercial or industrial properties. The backflow device is owned and maintained by the property owner and the testing is performed by our certified backflow testers. A fee is included in the customers' water bill for the testing service.

Scheduled appointments for the testing are usually not necessary, since commercial properties are tested during normal business hours and most residential properties have the device located on the outside of the building.

All properties with irrigation systems and all commercial and industrial buildings require backflow devices. The lack of a device at your property could impact the health of your family or neighbors. Please contact the meter department at the phone number shown below if you have any questions about the need for a backflow device at your property or questions about the testing process.

Our uniformed personnel will explain their presence and request your cooperation when they arrive at your property. MWW's Backflow Prevention Program is another example of the effort taken to ensure that your drinking water is of the highest quality and safe for consumption.

Water Works Meter Department Phone (603) 624-6494 ext. 2813

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