Time for your annual backflow inspection? Call 209-533-1010 for backflow testing and certification services in Sonora.

Imagine drinking or washing in contaminated water—without even knowing it.



To prevent illness around your community, it’s crucial that your backflow prevention device passes annual inspection. Not doing so will not only harm your family, but your greater community as well.

The backflow valve should be tested by checking for high or low pressure using a gauge. If the valve is loose, then there is risk of backflow. Backflow in your water supply can stream into the larger community and pose as a public health risk.

Backflow refers to the reversal of the flow of water into the potable (or safe) water supply. When the non-potable water mixes with potable water, this is referred to as backflow. Backflow can cause illness and unpleasant odors.

A loss of pressure in the water supply can cause backflow of water into your drinking water. Contamination can be caused by pet wastes or fertilizers.

The most common type of backflow is backsiphonage, which is caused by a sudden loss of pressure. This may result from a broken water main; if a nearby fire hydrant has been used, backsiphonage can also occur. This is typically not a problem if your plumbing systems are maintained according to code.