The answer to 'backflow preventer rusty water' is that a rusty backflow preventer is a common issue that can be caused by several factors, including age, corrosion, or mineral buildup. This can lead to discolored, rusty-looking water coming from your faucets or fixtures.
Some common causes of a rusty backflow preventer include hard water, which can deposit minerals and lead to corrosion over time. Additionally, older backflow preventers made of metal are more susceptible to rusting. In some cases, the backflow preventer itself may be faulty or damaged, leading to rust and discoloration.