If you have received notice that the backflow assembly in your sprinkler system must be tested, we can do that.The $40 service includes testing the unit, sending a copy of the results to your water district, and sending you a copy of the results with your bill. Parts and labor cost extra if repairs are required. 
Backflow testing is required by the State Department of Health to protect the public drinking water supply. Backflow assemblies prevent contaminants from being siphoned back into the public drinking water supply.