Cross-Connection Control Surveys are now Required by the Washington State Department of Health
The Washington State Department of Health now requires that all water purveyors protect the public
water supply from contamination by eliminating actual cross-connections and reducing the hazard of potential
cross-connections. It also requires all purveyors to report annually the potential for these hazards.
Survey forms will be sent to all district customers and completion and return of the forms to the district
is required by the Washington State Department of Health. Your completion of this survey will assist the
District in satisfying these requirements.
Water District 119
A cross-connection is an unprotected or improper connection to the system that may cause contamination or
pollution to enter the public system. It can be a direct or indirect connection with any other water source,
sewer, drain, conduit, pool, storage tank, plumbing fixture or other device which contains, or may contain,
contaminated water, sewage or other liquid or waste of unknown or unsafe quality. The system water
pressure can suddenly drop because of heavy usage, a firefighting in the area or a broken main. Should any
of these condition occur, contamination may be siphoned back into your plumbing system from unprotected
cross-connections with your home. Even though the District has a very reliable water distribution system,
pressure drops can still occur. All homes have potential cross-connections. The water pipes and
plumbing fixtures may be the link for contamination to get back into the drinking water supply. They can
be a serious health hazard. The reversing of the flow direction in the pipes is called backflow. Backflow
from cross-connections can result in chemicals, poisons and bacteria entering the water you drink.
Examples of cross-connections include:
Improperly installed irrigation systems which may allow back-siphoning.
Improperly plumbed water-using devices such as hot-tubs, boilers or dishwashers.
Irrigation systems served by an auxiliary source, such as a private well or creek, with inter-ties
to the domestic piping system.
Interconnections between potable and non-potable water systems.
Most modern plumbing systems have backflow devices built in (toilets, sinks, modern hose connections).
For more information and detailed descriptions of cross-connections, please view the document
at this EPA link:
EPA Cross-connection info
Every customer served by Water District 119 is required to complete and return a Cross-connection
Control Survey form. The survey includes identifying plumbing fixtures present in your home or business.
After the District receives the completed surveys, we will review that data and determine homes
and businesses that need plumbing inspections, and will notify them by phone or mail.
Help to protect your yourself, your neighbors and your community to eliminated unprotected cross-connections
by completing and returning your survey form.
Forms can be returned with your regular water bill payment, or mailed to:
32730 NE Big Rock Rd.
If you have any questions, please call the District at (425) 788-2885 between 9 AM and 4 PM, Monday - Thursday.
Download Survey Form
(Adobe pdf format)