Is it okay to dump
grease down my house drains?
No, dumping grease down your house
drains will cause grease buildup in your own
drain lines. Some people believe that if you mix
hot water with the grease, it will not clog your
lines. While this may not clog the
lines in your immediate house, by the time the
grease gets to your sewer pipe it will have
cooled enough to build up. Keep in mind, you are
responsible for the maintenance of your side
sewer and calling out a plumber for this type of
maintenance can be very expensive.
Is it okay to dump car oil
down the sanitary drain system in my house?
No, oil causes the filtration system
at the treatment plant to fail and the
filtration system must be cleaned and replaced,
causing thousands of dollars in damage.
Is it okay to flush
plastic items down the toilet?
No, flushing plastic items and other
non-biodegradable material, such as many brands
of baby-wipes, down the toilet causes problems
in sewer lines. The material will hang up in
your line and cause blockages. If the material
reaches the treatment plant it will cause
problems in the treatment process as well.
What is this manhole for
in my back yard?
The manhole is used for access to the
system for maintenance and cleaning.
What should I do if I see
liquid flowing out of a sewer manhole?
Contact the District at 425-355-3355.
How are sewer lines
Sewer lines are systematically
cleaned using high-pressure jet nozzles that
scour the sewer lines of grit and grease debris
that is then vacuumed out and disposed of at the
treatment plant. An inspection camera is also
used to view the inside of the sewer lines for
evaluation purposes to determine line repair or
Did you know?
from your house
is not only from the toilets,
but also from showers, dishwashers, sinks, and your clothes washer.
Big Gulch Wastewater Treatment Facility
9417 62nd Pl W
Phone Number: 425-355-6637
Fax Number: 425-355-4263