Keeping our water supply safe requires a lot of testing. The City of Bend monitors and tests our drinking water at the meters to make sure we don't have any backflow problems that could contaminate the supply. But homeowners with sprinkler systems are responsible for their own backflow testing. “There's protection at the meter and test.  So the city protects the water supply.  But customers with irrigation systems. That’s their responsibility to test.” Bob Phillips of "Bob's Jobs" does backflow testing: “What the backflow assembly does is prevent any contaminated water from flowing back into the domestic supply and contaminating either the residence or the neighborhood.” The City of Bend is sending out letters reminding homeowners to get the irrigation backflow testing done. It is required by federal law.