To safeguard public health by protecting your water supply from possible contamination, the State of California and San Lorenzo Valley Water District require installation of backflow prevention devices where plumbing systems are exposed to potential contamination or poor water quality.

The San Lorenzo Valley Water District's Ordinance No. 65 sets forth requirements for the protection of the public water system by preventing backflow or backsiphonage.

Backflow is the flow of water or other liquids, mixtures or substances under pressure into a potable water supply system's distribution pipes from any source or sources other than those of the public water system. Backsiphonage is the flow of water or other liquids, mixtures or substances into a potable water system's distribution pipes from any sudden reduction of pressure in the public water supply system.

Some examples of where protective devices are required are: residences with an additional water supply (such as a well), swimming pools or irrigation systems supplied by a separate water service, buildings with internal booster pump systems, buildings with auxiliary water systems, buildings with a long service line where entry is restricted, and sewage pumping or treatment plants.

The installation of this device is the responsibility of the water customer and shall conform to District specifications. The District requests that you make an appointment for an on-site inspection to determine if adequate protection is presently installed or needed at your property.

To make this appointment and obtain answers to any questions you may have please call the District office at (831) 338-2153. Your cooperation in protecting our water supply is appreciated.