Fisher Irrigation is now offering annual backflow testing! Townships are now requiring ALL backflows to be tested annually, which is the sole responsibility of the homeowner. Backflow testing is a service that checks your backflow preventer device by assessing its pressure levels to insure proper operation. When backflow is present, contaminated water can be let into your clean water. As a New England Water Works Association Certified Backflow Prevention Device Inspector/Tester, it is our duty to make sure your backflow preventer is working properly. If you receive notice that your inspection is due, call the office at 215-942-0800 to schedule service.