New domestic supplies

In line with the recommendations of the Water Regulations Advisory Scheme guidance note 9-04-05 Cambridge Water requires all new non-domestic supplies to have whole-site backflow protection to fluid category 3.

This should be installed at the boundary of the premises or at the first available aboveground location. The backflow protection should be a Double Check Valve or other no less effective device.

Cambridge Water will inspect the work prior to any connection being made to the mains network.

For more information visit

WRAS Information on Notification of Proposed Plumbing Work

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