TRAVEL NOTICE: HWY 217 between Hollister Ave and Sandspit Rd will be closed overnight (10 PM–6 AM) from 7/16–7/17 and 7/19–7/24. Please use HWY 101/Fairview Ave exits or an alternate route. Project info. 

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An illustration of how backwater valves work
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Protect Your Home with a Backwater Valve

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A backwater valve is a backflow prevention device that prevents outbound wastewater from re-entering a property. If your property has drainage fixtures located below the elevation of the next upstream manhole, you may be required to install and maintain a backwater valve.