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King County Wastewater Treatment Division's (WTD's) mission is to protect public health and enhance the environment by collecting and treating wastewater while recycling valuable resources for the Puget Sound region.

The purpose of the WaterWorks Grant Program is to support sound investments in clean water and the community. WaterWorks provides funding to organizations for projects that create a benefit to or improvement of water quality within WTD’s service area and benefit its ratepayers.

Non-profits, schools and educational institutions, cities, counties, tribes, and special purpose districts are eligible to apply, and partnerships are encouraged. Community involvement and support are key evaluation criteria, in addition to water quality benefits. The Wastewater Treatment Division welcomes proposals that meet the King County Executive’s Equity and Social Justice Initiative.

Available funds

In 2016, approximately $850,000 of funding will be available for projects. Applicants can request funding from $25,000—$250,000.


In April 2015, the King County Council passed Ordinance 18031  establishing the grant award criteria and process for the WaterWorks Grant Program. The ordinance authorized the release of $2 million over the 2015-2016 biennium. In March 2016, the King County Council passed Ordinance 18261  amending the grant award process.

This amount represents 0.75 percent of the annual King County Wastewater Treatment Division operating budget, which may be allocated for projects benefiting water quality in the regional WTD service area.

Application materials for the next grant cycle will be posted here April 20, 2017, with first deadline (for LOI) June 7, 2017. View our grant program schedule for details.

WaterWorks news

July 25, 2016 -- King County Council approves WaterWorks Round 1 project grants

In addition to WaterWorks grants, water quality project funding is available through King County Council allocated funding. For more information, contact your councilmember.

For 2015-2016, 27 council-allocated water quality improvement projects were funded.

View more news and updates.

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Elizabeth Loudon

Julia Yen