Here are some commonly asked questions from our customers:
What is the Purpose of a Grease Trap?
• A grease trap is designed to
separate Fats, Oils, and Grease
(FOG) and solid food waste
from your kitchen wastewater.
• Buildup of FOG and solid
food waste in your plumbing
may cause blockages in either
your plumbing or the sanitary
sewer lines. This can lead to an
overflow into your building, a
neighbor’s building, streets, or
the environment. It is important
to clean your grease trap regularly.
• Grease traps shall be cleaned at
least once every 30 days. More
frequent cleaning may be
• Your sinks are draining slowly,
possibly due to buildups in the trap.
• Water levels in the trap or floor drains
are high,possibly due to grease-related
blockages in your plumbing.
• The grease trap smells bad because
solids are filling the bottom of the
• Your trap is not sized correctly for
your restaurant operations, menu,
or number of meals served.
Twenty-Five Percent Rule
• Clean the trap when it is twenty five percent (25%) full of FOG
and solid food waste or within
30 days of the last pumping,
whichever comes first.
Common Problems Leading to Grease Trap Repair or Replacement
• Grease trap installed
backwards, without flow
controls, or otherwise in
violation of plumbing codes or
• Missing or damaged parts,
such as the removable
• Leaks due to rust holes or
punctures in the walls or floors.
• Illegal connection to the
dishwasher or garbage grinder
to the grease trap.
Information Provided by The City of San Jose