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Cross Connection Terms & Brochures

Authority having jurisdiction – The official, board, department, or agency authorized to administer and enforce the provisions of the Uniform Plumbing Code. In Tacoma, the Public Works Department’s Building and Land Use Services Office is the Authority Having Jurisdiction but Tacoma Water is responsible for cross connections.

Authorized tester
- The BAT designated by the customer to perform the annual backflow assembly testing. Tacoma Water automatically sends the test due notices to the chosen tester on behalf of the customer.

Backflow
– The undesirable reversal of flow of water or other substances through a cross-connection into the public water system or the consumer’s water system.

Backflow assembly tester (BAT)
– A person certified by the State of Washington to test backflow assemblies.

Cross connection
- Any actual or potential physical connection between a public water system or the consumer's water system and any source of nonpotable liquid, solid or gas that could contaminate the potable water supply by backflow.

Double check valve assembly
– A testable assembly approved for installation by the State of Washington Department of Health that consists of two independently loaded check valves and two resilient seated shut off valves.

Double check detector assembly
– A testable assembly approved for installation by the State of Washington Department of Health that consists of two approved double check valve assemblies arranged in parallel. The bypass assembly is equipped with a meter to detect leakage or water use.

High health hazard
– A cross connection that could impair the quality of water and create a public health hazard through poisoning or spread of disease.

Low health hazard
– A cross connection that could cause an impairment of the quality of water to a degree that does not create a hazard to public health but does adversely and unreasonably affect the aesthetic quality of the water.

Pressure vacuum breaker assembly
– A testable assembly consisting of an internally loaded check valve, an independently operating air inlet valve and two resilient seated shut-off valves.

Reduced pressure backflow assembly
– A testable assembly approved for installation by the State of Washington Department of Health that consists of two independently loaded check valves, a spring-loaded differential pressure relief valve and two resilient seated shut-off valves.

Brochures

The brochures below contain some general information regarding cross connection control issues.  For specific requirements please contact us at (253) 502-8207 or by email at backflow@cityoftacoma.org.

Irrigation System Requirements


Health Hazards


Household Hazards


Residential Fire Systems


Thermal Expansion


More Resources

PNWS-AWWA Cross Connection Control Committee

Western Washington Cross Connection Control Professionals "The Group"

American Backflow Prevention Association


Spokane Regional Cross Connection Control Committee


USC Foundation for Hydraulic Research and Cross Connection Control


Washington Administrative Code for Cross Connection Control

Tacoma Municipal Code for Cross Connection Control