TO: Board of Supervisors
FROM: Brian Bordona, Interim Director, Planning, Building, and Environmental Services
REPORT BY: Jamison Crosby, Natural Resources Conservation Manager
SUBJECT: Status Update on Watershed Monitoring Study of the Lake Hennessey and Milliken Reservoir Watersheds
RECOMMENDATION
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Interim Director of Planning, Building, and Environmental Services requests the Board of Supervisors receive an update regarding the watershed monitoring study of the Lake Hennessey and Milliken Reservoir Watersheds.
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EXECUTIVE SUMMARY
The City and County have a shared interest in gathering additional data to further our understanding of how land use changes in the Lake Hennessey and Milliken Reservoir watersheds might impact the drinking water in these reservoirs. To that end, the City and County have been collaborating since 2017 on a watershed monitoring study which attempts to characterize the water quality of the watersheds contributing to these water bodies. The first water quality samples were collected in fall 2019. The Memorandum of Understanding guiding the work was amended on November 8, 2022, allowing the work to continue for an additional three years, through June 30, 2025.
FISCAL & STRATEGIC PLAN IMPACT
Is there a Fiscal Impact?
No
County Strategic Plan pillar addressed:
Vibrant and Sustainable Environment
ENVIRONMENTAL IMPACT
ENVIRONMENTAL DETERMINATION: The proposed action is not a project as defined by 14 California
Code of Regulations 15378 (State CEQA Guidelines) and therefore CEQA is not applicable.
BACKGROUND AND DISCUSSION
The City of Napa owns the Lake Hennessey Reservoir and the Milliken Reservoir which serve as municipal drinking water supplies for the residents of Napa and over 2,000 customers in unincorporated Napa County. The Hennessey watershed drainage area is composed of approximately 34,000 acres reaching as far north as Angwin. Of this total area, the City owns just 2,822 acres. The Milliken watershed drainage ar...
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