About Us   /   Management

Grant Davis, General Manager

As General Manager of Sonoma Water, Grant Davis is responsible for Sonoma Water’s core functions of providing drinking water to 600,000 residents in portions of Sonoma and Marin counties and wastewater management for eight zones and districts throughout Sonoma County.  Mr. Davis and his team also maintain nearly 100 miles of streams and detention basins for flood protection and manage a nationally recognized Russian River Watershed Restoration Program for the benefit of three federally listed fish species.

Since 2015, Sonoma Water has implemented a renewable energy portfolio that resulted in a carbon free water supply and distribution system. Sonoma Water has also been a leader in the development of several successful federal and state initiatives, such as the North Coast Resource Partnership, San Francisco Bay Area Integrated Regional Water Management Program, North Bay Water Reuse Authority and Pacific Coastal Salmon Restoration Fund.

Prior to joining Sonoma Water in 2007, Mr. Davis was Executive Director of The Bay Institute, a science-based nonprofit, dedicated to protecting the San Francisco Bay-Delta Watershed and improving water management in California. His experience also includes working for three members of Congress, a State Senator and an Assemblywoman.  

Mr. Davis has served as Director of the California Department of Water Resources under Governor Brown. He is past President of WateReuse, California and is currently a member of the University of California’s President’s Advisory Commission, for the Division of Agriculture and Natural Resources.  Mr. Davis also serves as a member of the Integrated Climate Adaptation and Resiliency Program Technical Advisory Committee for the Governor’s Office of Planning and Research. Mr. Davis received his Bachelor’s Degree in political science from the University of California at Berkeley.

Grant Davis

 Management Team (in alphabetical order by last name):

Carlos Diaz, Deputy Director of Engineering

Carlos Diaz is a Deputy Director of Engineering, overseeing the Design Engineering, Electrical Engineering, Construction Management, Survey/Right-of-Way, CAD/GIS, and Technical Writing workgroups. He has a significant breadth of experience in wastewater, water and flood related engineering. Mr. Diaz joined Sonoma Water in October 2017 as an engineer in the Design Engineering section following 13 years in private consulting. He spearheaded and managed the planning, design, and implementation of Sonoma Water’s OneRain network – a first of its kind, real-time rainfall and stream gage network in response to the 2017 fires. Mr. Diaz also served as Engineer of Record for several dam inundation studies pertaining to Sonoma Water’s four principal flood management reservoirs located within the Central Sonoma Watershed Project, and he has been pivotal in securing $1.2 million for comprehensive vulnerability assessment and planning of the Central Sonoma Watershed Project. He holds a master’s degree in civil and environmental engineering from Stanford University. 

Kent Gylfe, Director of Engineering 

Kent Gylfe is Director of Engineering responsible to manage Sonoma Water’s Engineering and Resource Planning Division. Mr. Gylfe joined Sonoma Water in the year 2000 as a design engineer, and since 2004 has progressively served in engineering management roles with a focus on capital project implementation for Sonoma Water’s water supply, wastewater management, and flood control infrastructure systems. Prior to joining Sonoma Water, Mr. Gylfe worked for 10 years as an engineering consultant. He received a Bachelor of Science degree in civil engineering from the University of California, Davis.  

Pamela Jeane, Assistant General Manager - Water and Wastewater Operations

Ms. Jeane is responsible for the continuous operation and permitting of Sonoma Water's potable water and sanitation facilities. She completed her Bachelor's degree in civil engineering at California State University at Chico. Upon graduation, Ms. Jeane worked overseas for two years. She has been with Sonoma Water since 1991 and is a registered civil engineer in the State of California.

Pam Jeane

David Manning, Environmental Resources Manager

Mr. Manning received a Bachelor of Science degree in Resource Management from the University of California, Berkeley and Master of Science degree in Natural Resources from Humboldt State University. He has worked for Sonoma Water for the past 20 years. As an Environmental Resources Manager, he manages teams of scientists and planners dedicated to minimizing the effects of water supply, flood control, and sanitation activities on threatened and endangered steelhead, Chinook salmon, and coho salmon. Before joining the Water Agency in 1999, he was a fishery biologist for the National Park Service at Point Reyes National Seashore and Golden Gate National Recreation Area. He is Past-President of the California-Nevada Chapter of the American Fisheries Society and served as Associate Editor for the North American Journal of Fisheries Management. 

David Manning

Jessica Martini-Lamb, Environmental Resources Manager

Jessica Martini-Lamb is an Environmental Resources Manager and wildlife biologist for Sonoma Water. She manages environmental regulatory permitting and compliance, and biological and water quality monitoring for Sonoma Water’s projects in the Russian River and San Francisco Bay watersheds, Russian River estuary management, and water supply, flood control, and sanitation operations and maintenance projects. Ms. Martini-Lamb has been with Sonoma Water since 1998. Prior to joining Sonoma Water, she worked as an environmental consultant, primarily on energy and water projects in the western United States. Ms. Martini-Lamb received a Bachelor of Science in Environmental Biology Management from the University of California, Davis.

Jessica Martini-Lamb

Donald Seymour, Deputy Director of Engineering

Mr. Seymour is a Deputy Director Engineer managing Sonoma Water’s Resource & Planning, Groundwater, Water Use Efficiency and Technical Writing  Sections.  He has more than 25 years of experience in water supply planning in Sonoma County and the Russian River Watershed, including California water rights issues, hydrologic and hydrogeologic planning studies, hydraulic modeling and Urban Water Management Plan development.  Mr. Seymour received a Bachelor of Science degree in microbiology and a Master’s of Science degree in civil engineering from the University of California at Berkeley.  Mr. Seymour has been with Sonoma Water since 2000 and is a registered civil engineer in the State of California.

Brad Sherwood, Assistant General Manager - Business Services & External Affairs

Mr. Sherwood is an assistant general manager overseeing the functions of business services and external affairs, including administration, finance, government relations, community affairs, emergency management, security and project management.  Since joining Sonoma Water in 2006, he has worked with his colleagues to develop and implement strategic legislative, funding and community affairs programs that support the reliable delivery of drinking water to 600,000 residents in portions of Sonoma and Marin counties, wastewater collection and treatment services to 8 sanitation districts/zones, and support for flood protection projects.  Mr. Sherwood is a member of the Leadership Santa Rosa and Sonoma County Higher leadership institutes. He graduated with his masters in political management from the George Washington University in Washington, D.C. and received his undergraduate degree in government and journalism from California State University, Sacramento. He is an active member of the Association of California Water Agencies, serving nearly a decade on the Region 1 Board of Directors, and participates on a variety of leadership committees for the North Bay Watershed Association and California Special Districts Association. Mr. Sherwood is an active member of his community and enjoys volunteering for a variety of neighborhood improvement projects since the Tubbs 2017 fire destroyed his and thousands of homes in Sonoma County.