Federal and state laws require all customers and public water suppliers to take adequate measures to protect our drinking water system from the contamination that can occur through unintentional backflow, or the reversal of flow in water from the treatment plant to the customer. Backflow can create health hazards through "cross-connections," when contaminated water makes a connection to your water supply system.
Backflow may occur if the drinking water system suddenly loses pressure when, for example:
The City is conducting field inspections for backflow hazards. If inspectors identify an issue on your property, you will be notified.
Though not tested by governmental agencies, private wells can still pose a hazard to the drinking water system and must be equipped with proper backflow prevention devices.
Through its Sunnyvale Water Distribution Cross-Connection Program, the City works with consumers, architects, contractors and engineers to ensure that backflow prevention devices are incorporated into project plans, installed correctly and maintained and tested annually.
The City also conducts free inspections to help residents and business owners determine whether they are in compliance. To arrange a City inspection:
If you need a backflow device, the City will notify you within 30 days with a letter included with your utility bill.
Your water service may be disconnected if you fail to comply with our requirements after repeated requests from the Sunnyvale Water Program.