Anyone can install a device; however, District approved Riverside County Certified Testers are responsible for performing accurate tests, and repairing or replacing devices that fail. Additionally, testers must report all repairs and test results to Rancho Water. The tester is required to give a copy of the completed test report to the customer and fax it to (951) 296-6865 or send the original to Rancho California Water District: 42135 Winchester Road, Temecula, CA 92590.