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About SPU
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Rainwater Permit
Rainwater Permit
The Seattle Public Utilities seeks a water permit to capture and use rainwater collected from rooftops that would otherwise enter Seattle’s sewer system, be conveyed to a treatment plant and discharged via a deep marine outfall. The rainwater that will be captured under this permit would not otherwise end up in Lake Washington or other freshwater bodies, except during combined sewer overflow events.
Rainwater harvesting systems established under this permit will not be connected to and will be separate from the public water supply system operated and maintained by the Seattle Public Utilities. It is anticipated, however, that the implementation of this permit will benefit SPU’s public water supply system by reducing the demand for potable water that is currently used for non-potable purposes. It may also benefit Seattle’s sewage collection system by lowering storm flows into the sewer system.
With this water permit, Seattle will be granted the right to collect and use rainwater in the areas of the City served by the combined and partially combined sewer system. Under the authority of this permit, Seattle will authorize, with conditions, individuals, businesses and other entities within this place of use to collect and use rainwater. In effect, it will enable a system of non-potable, municipal uses of rainwater, distributed on a parcel by parcel basis. This application includes a geographic designation for areas covered. View map >
Upon approval of this water right permit, Seattle will develop an application and permit system to serve property owners and maintain records of activity authorized and requested by the WA State Department of Ecology.
Contact Information
For more information, contact Paul Fleming, paul.fleming@seattle.gov. or (206) 684-7626.
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