A properly installed Backflow
Prevention Device (BPD) is designed to prevent sewage from entering
your residence.
If a blockage occurs in the sanitary sewer
system, sewage will rise through a manhole and overflow to the
surrounding area. However, if your house plumbing is below the level of
the overflowing manhole, the sewage can backup through your house side
sewer lateral and enter your home through your plumbing drains.
By simply installing a BPD outside the home
below the lowest level of plumbing, the overflow will occur outside and
avoid damaging the floors and furnishings in your home.
BPD's operate automatically and can be
reasonably simple to install. Installation may be done by the home
owner or by a licensed
contractor registered with the
District.
If you are unsure whether you
already have a BPD or feel your home may be vulnerable to a sewage
backup, call the District office at 510-524-4668 and schedule a free
BPD inspection for your home.