Backflow Testing in Riverside, CA

The rule behind the test

RPU Water Operations runs a Cross Connection Control program under RPU Water Rule 13. A cross connection is any point where drinking water piping can touch something that should never reach it, such as irrigation water, a boiler loop, a process line or a fire sprinkler system. A backflow assembly sits between the property and the public supply and blocks water from reversing direction when pressure in the street drops or pressure inside the building rises.

The assembly belongs to the customer. RPU's service rule puts the meter and the service connection on the utility side, while the piping beyond the meter, including any required backflow assembly, is the owner's to furnish and maintain.

Testing at a glance

What happens during a test

1. The tester records the assembly type, size and serial number.
2. Gauges are attached to the test cocks and the shutoff valves are closed in order.
3. Each check valve, and the relief valve on reduced pressure assemblies, is checked against its required pressure differential.
4. Water is restored and the report is filled out and submitted.

Water is off for a short stretch, so businesses usually schedule around open hours.

If the assembly fails

Failures usually trace to debris on a check seat, a worn disc or spring, a torn diaphragm or a relief valve that weeps. A rebuild kit often brings the unit back into spec, and the rule calls for a retest after any repair. Badly corroded or obsolete units may need replacement, which can involve a permit from City of Riverside Building & Safety.

Summer heat and exposed assemblies

Assemblies above ground take strong sun most of the year. Cracked rubber parts and faded enclosures are common, and an insulated cover helps on the rare frosty nights.

Cost factors

Cost depends on the assembly type and size, the number of assemblies on site, access, whether parts or a rebuild are needed, and whether replacement is required.