Backflow devices are required by the New Hampshire Department of Environmental Services – Drinking Water & Groundwater Bureau (NHDES DWGB) as part of the Cross-Contamination Control Program.  In the event of a decrease or increase in water pressure, the backflow device protects any contaminated water from being siphoned back into the water system, protecting the water system from potential contamination.

MVD has licensed backflow inspectors who perform annual and semi-annual testing of the backflow devices. Annual tests are required for businesses considered “low” hazard (such as office buildings) and semi-annual tests are required for “high” hazard facilities (such as gas stations and medical facilities).

Questions about this program? Please contact Shelly Thompson by phone at 603-424-9241 x: 104 or email to sthompson@mvdwaternh.gov.