In water supply systems, water is normally maintained at a significant pressure to enable water to flow from the tap, shower, or other fixture. Water pressure may fail or be reduced when a water main bursts, pipes freeze, or there is unexpectedly high demand on the water system (for example, when several fire hydrants are opened). Reduced pressure in the pipe may allow contaminated water from the soil, from storage, or from other sources to be drawn up into the public system.
We are required by state water quality regulations to require that certain customers connected to our water system, install and maintain a backflow prevention valve. Customers who have groundwater wells, water storage tanks, alternate water supplies, certain fire sprinkler systems, swimming pools and those that handle chemicals, hazardous materials or have pressurized systems such as carbonation are required to install the backflow valves to ensure that these hazards cannot flow back into the District’s water system,
State law also requires that these valves be tested by a qualified, state certified tester each year. We recently mailed out notices to all customers who have backflow valves requiring annual testing. The letter and certified tester list are linked below, and we have provided a link to upload your backflow test results: