Главная About Engineering Standard Specifications STANDARD SPECIFICATIONS Standard Specifications and Standard Drawings for the Construction of Water Facilities View Download: Standard Water Construction Notes Download: Plan Submittal and Approval Requirements Mesa Water District does not endorse any commercial entities, including backflow device testers. Any person possessing a valid certificate issued by the County of Orange Health Officer may perform testing. Click on the Orange County Cross Connection link to find backflow testers and for other Cross Connection inquiries. Engineering Engineering Development Services Rules and Regulations for Water Service Standard Specifications