Water Quality
& Treatment
 To protect public health, the United
States Environmental Protection Agency
(EPA) and the Washington State Department
of Health (DOH) set the standards for
public drinking water quality. These
standards require specific action,
including public notification, if levels
of certain contaminants are exceeded.
To
ensure safe drinking water for the public,
the water supply is chlorinated.
Other treatment includes manganese removal
and the addition of sodium hydroxide for
corrosion control. Covington Water
District's Wellhead Protection Plan
helps protect our groundwater supplies
from contamination, and ensures a safe
drinking water supply for our customers.
Additional protections include a risk
analysis, a spill response plan, and
extensive land use and potential
contaminant source inventory, and an
education program to encourage our
customers to use least-harmful products
and best management practices to protect
groundwater. CWD also has a
Cross
Connection Control Program, which
requires customers with potential backflow
from their private system into the public
water system to install backflow
prevention assemblies (required by state
law), and to have the backflow assembly
checked annually by a certified tester.
Each month, CWD draws over forty water
samples from key locations throughout our
service area, and tests them for the
presence of coliform bacteria.
Regularly scheduled testing is also done
for inorganics, volatile organics,
synthetic organic chemicals, radionuclides,
and thrihalomethanes, along with other
tests as required. Testing is
performed by state certified labs, and
test results are routinely submitted to
DOH, which monitors CWD's compliance with
the many regulatory standards and testing
protocols required to assure safe drinking
water. A
Water Quality Report is sent to
customers annually to inform them about
their drinking water. If you would
like a printed copy please call
253-631-0565.
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