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OPERATIONS
Cross Connection
Cross connection occurs when a contaminated substance or source of pollution is
accidentally drawn into the public water supply. It usually happens when there is
a rapid drop in water pressure (such as a main break) which can cause a reverse
flow or suction in the water lines of your home. If a water line (such as a garden
hose) is submerged in a polluted or contaminated substance when the pressure drops,
that substance can be drawn into the water supply. When the pressure returns to normal,
the substance will flow in the opposite direction. It is possible to have pesticides
and fertilizers pulled into your water lines where it may later flow out of the tap into
your drinking water. The results can be deadly.
To prevent cross connections from occurring, follow these precautions:
- Never submerge a garden hose in a bucket, sink, or anything else.
- Do not use a spray attachment on your garden hose without first installing
a backflow prevention assembly.
- Keep the end of the garden hose clean and free of contaminants.
- Install a backflow prevention assembly on your irrigation system.
To install an irrigation system, you must comply with the following
requirements:
- Irrigation systems connected to a drinking water system must be equipped
with a backflow prevention assembly that has been approved by the Washington
State Department of Health; and
- Assemblies must be tested upon installation and annually thereafter by a
state certified Backflow Assembly Tester.
There are many types of backflow prevention assemblies. They vary in design,
function, and price. If you have questions regarding cross connection or backflow
assemblies, call or e-mail Mick Holte at
425-398-4417.
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