Backflow Prevention Program

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. Examples of potential cross connections are commercial and residential boilers, clothing washing machines, and automatic dishwashing machines. 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 presently 1052 commercial and residential backflow devices in the Gorham water system.

All commercial and industrial buildings require testable backflow devices. These devices are owned and maintained by the property owner and testing is performed by our certified backflow testers. Reduced Pressure Zone backflow devices are tested bi-annually and all dual check devices are tested annually. A fee of $75.00 is charged for each testing service. There are a total of 83 commercial backflows in the Gorham water system.

Scheduled appointments for the testing are usually not necessary, since commercial properties are tested during normal business hours.

The Gorham Water & Sewer Departments 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. If you have any questions or concerns about your backflow device, please call our office.