Sonoma Valley Groundwater Basin

View Sonoma Valley Groundwater Basin Map

Sonoma Valley Groundwater Sustainability Agency (GSA)

The Sonoma Valley Groundwater Sustainability Agency (GSA) is a newly-formed public agency and its purpose is to secure groundwater sustainability for the Sonoma Valley groundwater basin. The agency has a governing board, an administrator and an advisory committee.


Susan Gorin, Chair County
David Cook, Vice-Chair Sonoma
Mark Heneveld VOMWD
Vickie Mulas Sonoma RCD
David Rabbitt Water Agency
Mike Sangiacomo NBWD
Gary Edwards Alternate Sonoma
Bruce Adams Alternate VOMWD
Bruce Abelli-Amen


Sonoma RCD
James Gore Alternate County & Water Agency
Carolyn Wasem



The Board meets at 4 p.m. on the fourth Monday of every other month. Meeting dates through August 2018 are:  August 28, 2017; October 23, 2017; January 22, 2018 (moved to January to avoid the Christmas holiday); March 26, 2018; June 25, 2018; August 27, 2018.

The regular meeting location is the Valley of the Moon Water District board room, 19039 Bay Street, Sonoma.

Advisory Committee

The purpose of the advisory committee is to provide input and recommendations to the Agency Board on groundwater sustainability plan development, implementation and policies. The intent of the committee is to provide community perspective and participation in the Agency. The composition of the Advisory Committee is intended to represent the beneficial uses and users of groundwater identified in the Sustainable Groundwater Management Act.

Advisory Committee terms will be two-years.

Governing board

The Sonoma Valley GSA is governed by a six-member board comprised of representatives from the following entities: County of Sonoma, Sonoma County Water Agency, City of Sonoma, Valley of the Moon Water District, Sonoma Resource Conservation District and the North Bay Water District. The names of board members is below.

Sonoma Valley GSA Board Members:
David Cook City of Sonoma
Mark Heneveld Valley of the Moon Water District
Vickie Mulas Sonoma Resource Conservation District
David Rabbitt Sonoma County Water Agency
Mike Sangiacomo North Bay Water District
Susan Gorin County of Sonoma
Gary Edwards – Alternate City of Sonoma
Bruce Adams – Alternate Valley of the Moon Water District
Bruce Abelli-Amen – Alternate Sonoma Resource Conservation District
James Gore – Alternate Sonoma County Water Agency and County of Sonoma
Carolyn Wasem – Alternate North Bay Water District

Contracted Staff

Valley of the Moon Water District general manager Dan Muelrath serves as the administrator, through a contract with the Sonoma Valley GSA. The administrator oversees scheduling and staffing board and advisory committee meetings, the budget, contracts and day-to-day functioning of the GSA. To contact Dan Muelrath, email

Jay Jasperse, chief engineer and groundwater manager for the Sonoma County Water Agency, serves as plan manager. Through a contract with the GSA, the Water Agency provides technical services to develop the Groundwater Sustainability Plan. The Water Agency also provides grant writing and outreach and communication services for the GSA. To contact the plan manager, email For questions on outreach and communications, contact or 524-8378.

2017 Public Meetings

Sonoma Valley Groundwater Sustainability Agency Board Meeting
October 23, 2017, 4:00 p.m.
Location: Valley of the Moon Water District, Board Room, 19039 Bay Street, Sonoma CA 95476

Sonoma Valley Groundwater Sustainability Agency Board Meeting
August 28, 2017, 4:00 p.m.
Location: Valley of the Moon Water District, Board Room, 19039 Bay Street, Sonoma CA 95476

June 8, 2017, 5:30pm
Location: Vintage House – 264 First Street East, Sonoma
Public hearings are scheduled to consider designating three local agencies to be responsible for ensuring groundwater is available now and into the future. The meetings will also include the election of the GSA officers, administration of the GSAs, and the advisory committee process. The hearings will be held on June 1 for the Santa Rosa Plain basin; June 8 for the Sonoma Valley basin; and June 22 for the Petaluma Valley basin.

March 27, 2017
A final round of community meetings on GSA formation were held in March and April of 2017. The meetings included a brief overview of SGMA requirements, followed by a description of the recommended governance structure of the proposed new Groundwater Sustainability Agencies (GSAs) in that basin.


2016 Public Meetings

June 30, 2016
Public Workshops were held in the summer of 2016 for each basin. The focus of the workshops was on receiving input from the public on the formation of Groundwater Sustainability Agencies (GSA).  GSA-eligible agencies have agreed conceptually on one GSA and one Groundwater Sustainability Plan (GSP) per basin.

2015 Meetings

November 12, 2015
In November and December of 2015, public workshops were held in Petaluma Valley, Santa Rosa Plain and Sonoma Valley to review the new law, why it’s needed, how it affects Sonoma County, and to discuss the formation of local Groundwater Sustainability Agencies. Below is the workshop agenda, plus meeting summaries and presentations.

To learn about future workshops, please sign up to receive regular updates.