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Together our voices are stronger, our financial contribution is greater, and our impact is deeper.

Our community needs your skills, commitment, and caring!

Membership in Impact100 Sonoma offers these opportunities and more:

  • Invitations to a variety of members-only events throughout the year, including educational forums, social events, and annual meetings
  • Voting to choose the recipients of the years grants
  • Participation in the grant review process to select grant finalists
  • Serving on standing committees such as events, communications, and membership
  • Greater knowledge of the needs in our community and the nonprofits rising to the challenge
  • Meeting and connecting with friends old and new
  • Sponsoring membership for women who might not otherwise be able to join

To become a member, you must be 18 or older. 

The annual membership donation is $1,200. Of that amount, $1,000 goes to fund grants that benefit the Sonoma Valley community.

Your membership also includes $200 to help cover the operating expenses of our volunteer-led organization. This fee represents your stake in our success by ensuring that every member’s $1,000 remains dedicated to grants. 

The $1,200 total is fully tax-deductible.

Please consider making an additional tax-deductible contribution to support our organization. We are grateful that so many of our members go above and beyond the annual membership and contribute additional funds to help us become more inclusive and forward-looking, sustain our operations, and build a stronger nonprofit community. These donations dramatically increase the possibilities of what we can achieve together. 

Individual Memberships

$1,200 Annual Membership ($1,000 for grants + $200 operations fee)

Optional, additional donations can be designated for:

Shared Memberships

Heres how it works: two women = one full membership = one vote. Find a partner to split the annual membership donation of $1,200. Or let us help you find one. As full members, both of you can attend meetings, participate in activities, and join committees, but youll share one vote to select nonprofit grant recipients. For more information about shared memberships, contact

Payment Options

By Credit Card

Pay through your member profile.

By Check

Renewing members may send a check alone, with no form required. If you are new member, download and fill out the Impact100 Membership Form and mail it along with your check payable to:

Impact100 Sonoma

P.O. Box 1958

Sonoma, CA 95476

NOTE: Please allow enough lead time for your funds to be received by the renewal deadline.

In Installments

If you prefer to pay over time, you can mail a monthly check or set up an automatic monthly payment through your bank. Payments must total $1,200 during the calendar year. To set up this option, contact

NOTE: You must renew your membership by December 31 to qualify for the upcoming voting year. Payments received after that date will go toward the following voting year.

Want to support Sonoma Valley in other ways?

  • Individuals can support our community through direct donations, by sponsoring a member, or through Tribute or Legacy gifts.   
  • Businesses can show their support by sponsoring an employee, sponsoring an event through direct or in-kind donations, or by underwriting our work.         




A just and thriving Sonoma Valley


Empowering women of Sonoma Valley to invest in a more sustainable nonprofit community through collective giving and responsible stewardship

Impact100 Sonoma is a member of Philanos

Impact100 Sonoma ©2024. All rights reserved

Impact100 Sonoma
P.O. Box 1958
Sonoma, CA 95476
(707) 939-5007

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