Woodland-Davis Clean Water Agency

The Project

In September 2009, the Cities of Woodland and Davis established the Woodland-Davis Clean Water Agency (WDCWA), a joint powers authority, to implement and oversee a regional surface water supply project. Construction on the Regional Water Treatment Facility began April 2014. A groundbreaking was held on April 10.

Monthly Project Updates

December/January 2014

January/February 2014

February/March 2014

April 2014

May  2014

June 2014

About the Project

The regional project will replace deteriorating groundwater supplies with safe, more reliable surface water supplies from the Sacramento River. Once complete, the project will serve more than two-thirds of the urban population of Yolo County, CA. It may also serve UC Davis, a project partner.

Primary Project Goals:
  • Provide a new water supply to help meet existing and future needs
  • Improve drinking water quality
  • Improve the quality of treated wastewater

Project Detail

Q: How much is an acre foot?
A: 325,851 gallons. That's enough to:
  • cover a football field with one foot of water
  • supply two typical families with enough water for one year

Project plans include a jointly-owned and operated intake on the Sacramento River (WDCWA in partnership with RD 2035), raw water pipelines connecting the intake to a new regional water treatment plant, and separate pipelines delivering treated water to Woodland, Davis and UC Davis. Improvements to existing water supply systems will vary for Woodland and Davis and will include facilities such as distribution pipelines, water storage tanks and booster pump stations.

The project will divert up to 45,000 acre-feet of water per year from the Sacramento River. Water rights were granted in March 2011, and will be subject to conditions imposed by the state. Water diversions will be limited during summer and other dry periods. A more senior water right for 10,000 acre feet was purchased from the Conaway Preservation Group to provide summer water supply. Groundwater will continue to be used by Woodland and Davis during when demand for water cannot be met with surface water supplies alone.

The water treatment facility will be constructed to supply up to 30 million gallons of water per day, with an option for future expansion to 34 million gallons per day. Of that amount, Woodland's share of treated surface water will be 18 million gallons per day, with Davis' share at 12 million gallons per day. Approximately 5.1 miles of pipeline will transport "raw" water from the surface water intake on the Sacramento River to the water treatment plant located south of Woodland (see map). From there, the treated water will travel 7.8 miles via pipeline to Davis, and up to 1.4 miles to Woodland.

Project Cost

Based upon the most recent engineering estimates, the development and construction of the Project is expected to cost roughly $228 million (in April 2013 dollars, which is a reduction from the original cost estimate of $325 million in mid-2009 dollars). This estimate, which includes expenditures since 2009 and local facility costs, changed as a result of aggressive cost-savings activities and refinements to project plans. Click here to view the history of project cost estimates.

The bulk of the project will be funded through customer water rates. The Agency is looking for ways to reduce Project cost impacts to customers, to include:

  • Aggressively seeking state and federal funding to reduced projected rate increases.
  • Partnering with Reclamation District 2035 to jointly finance, construct, own, and operate the water intake facility.
  • Awarding a Design-Build-Operate (DBO) service contract for the construction of project facilities. The Agency selected CH2M HIll, a highly-qualified contractor, to design, build, operate and maintain the water treatment facility. This will result in lower construction costs and fixed costs for operations for up to 15 years.
  • Appropriately sizing the water treatment facility based on detailed studies of current and future anticipated demand for water.

View the project map and video.

Project Timeline

Construction on the regional water treatment facility began April 2014. The facility is expected to be operational by the end of 2016.

NEWS & EVENTS


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