What Can You Do to Protect Local Waterways?
Wastewater Treatment 101
4 Many communities have a wastewater treatment
plant that incorporates a series of processes to
remove pollutants from water used in homes,
small businesses, industries, and other facilities.
All wastewater first goes through the primary
treatment process, which involves screening
and settling out large particles.
4 The wastewater then moves on to the
secondary treatment process, during which
organic matter is removed by allowing bacteria
to break down the pollutants. The treated
wastewater is then usually disinfected with
chlorine to remove the remaining bacteria.
4 Some communities go one step further and put
the wastewater through an advanced
treatment process to reduce the level of
pollutants of special concern to the local
waterbody, such as nitrogen or phosphorus.
After this step, the treated water finally flows
through pipes back to a local water body.
Primary
Flush Responsibly!
Don't pour household products such as
cleansers, beauty products, medicine, auto
fluids, paint, and lawn care products
down the drain. Properly dispose of them
at your local household hazardous waste
facility.
Wastewater treatment facilities are designed
to treat organic materials, not hazardous
chemicals. If you pour hazardous chemicals
down the drain, they might end up in your
local rivers, lakes, and coastal waters.
Dispose of excess household grease (meat
fats, lard, cooking oil, shortening, butter
and margarine, etc.) diapers, condoms,
and personal hygiene products in the
garbage can.
These materials can clog pipes, and could
cause raw sewage to overflow in your
home or yard, or in public areas. Overflows
often occur during periods of high rainfall or
snowmelt and can result in basement
backups, overflows at manholes, or
discharges directly to rivers, lakes, and
coastal waters.
Don't pour used motor oil down the drain.
Used motor oil can diminish the
effectiveness of the treatment process, and
might allow contaminants to be discharged.
The contaminants could pollute local
waterways or harm aquatic life.
If you're a dark room hobbyist, dispose of
spent fixer, developer, and other
photographic chemicals in separate
containers and transport them to a
hazardous waste facility.
Like household hazardous wastes and used
motor oil, photographic chemicals can
interfere with the wastewater treatment
process and could result in pollutants being
discharged into local waterways.
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Not Down
Drain!
X cleaners
X beauty
products
X medicine
X auto fluids
X paint
X lawn care
products
X grease
X diapers
X condoms
X feminine hygiene
products
X motor oil
X photographic
chemicals
Where
Does All the
Dirty Water
Go?
For more information on
the wastewater treatment
process, please contact
your local health or public
works department. Please
visit www.epa.gov/owm
for more information on
wastewater treatment.
United States
Environmental Protection
Agency
December 2002
•ocect me
environment
What You Flush or Pour Down Your
Drain Affects the Rivers, Lakes,
and Coastal Waters in
Our Community
Where does the water go after
you flush the toilet or drain the sinks
in your home?
When the wastewater flushed from your toilet
or drained from your household sinks, washing
machine, or dishwasher leaves your home, it flows
through your community's sanitary sewer system to
a wastewater treatment facility. The wastewater from
homes, along with wastewater from businesses,
industries, and other facilities, is treated by a variety of
processes (see inside for more information) to reduce or
remove pollutants.
What happens to the treated water when
it leaves the wastewater treatment plant?
The treated wastewater is released into local waterways
where its used again for any number of purposes, such
as supplying drinking water, irrigating crops, and
sustaining aquatic life.
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