Frequently Asked Questions

The Woodinville Water District strictly prohibits interconnection of other water supplies with the District’s distribution system. Auxiliary water supplies (private wells, piped irrigation sources, etc.) are a major cross-connection hazard and must be effectively isolated from the domestic water supply. 

The Woodinville Water District’s cross-connection policies and requirements for customers with private wells are: 

1. No backflow protection is required if the source is verified to be permanently inactivated. In such cases, formal abandonment, in accordance with the requirements of the Department of Health, should be pursued be the owner.
2. If the well remains active and the piping system is verified to be physically separated and permanently disconnected from the District’s distribution main, an approved double-check valve assembly is required at the service connection in order to provide a measure of protection against inadvertent interconnection of the water supply. New services will be LOCKED OFF until the Woodinville Water District verifies compliance. 

Visual inspection of the piping is required for premises retaining active well systems. All backflow prevention devices are subject to annual inspection and testing. The cost of an annual performance test and any required maintenance is the responsibility of the device owner.

ESA stands for Extended Service Agreement. Years ago, the District’s permanent water main system was not nearly as widespread through the District as it is today. As a convenience to certain property owners, the District allowed them to enter into Extended Service Agreements with the District, whereby they would be allowed to connect to a permanent water main some distance from their property—sometimes hundreds and in some cases, thousands of feet. The Extended Service Agreement is recorded against the title of the property, and runs with the property. Extended Service Agreements provide temporary water service until permanent service is available. When permanent service becomes available, the District terminates ESAs.