Backflow devices protect drinking water from your sprinkler system. Here is how the main types differ and why they need testing.
Irrigation water can pick up fertilizer, pesticides, soil and bacteria. If pressure in the public water line drops, that water could be sucked backward into the drinking supply. A backflow preventer is the device that stops it. Different devices suit different risk levels: a pressure vacuum breaker, mounted above ground and higher than the highest head; a double check assembly; and a reduced pressure zone device for higher-hazard situations.
Which device you need is set by your water provider. Most require testing on a schedule, with a certified tester and a report, because springs, seals and check parts wear out. Above-ground devices must be protected from freezing, since a cracked device can spray water and fails to protect. We install the type that is required, test and repair devices and prepare reports, and we advise on insulation and winter care.
Stops backflow.
PVB, DCA, RPZ.
Height and access.
Often yearly.
Insulate and drain.
For your provider.
Take the quiz, check a problem or ballpark a budget.
Most providers require one on irrigation systems. Check yours, and we explain what applies.
Many providers require an annual test.
Water inside can crack the device. Draining and insulating it prevents damage.
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