Some believe the issue a few homes have experienced are due to chemicals added to the water by the water districts”, said PulteGroup spokesperson Jacque Petroulakis in a statement.

(PulteGroup is the parent company of Pulte Homes and Centex.)
Last year,  Orange County had several judge class-action lawsuits against local water districts, for chemicals that allegedly corrode copper pipes.

One of the best prevention strategies to block these chemicals,  is to install a whole house filtration system, like this one :