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Independent validation that you are meeting Napa Green Vineyard and /or Napa Green Winery practice and performance-based standards, walking the talk, is critical to marketplace assurance. Our network of third-party auditors have gone through training in the Napa Green programming, and will validate implementation of practices that our team has not been able to review.
If you are interested in becoming a Napa Green Auditor, please reach out to wegotthis@napagreen.org.
Jill Brodt
An experienced sustainability auditor and California native who has called Sonoma County home for over 20 years. Jill’s previous role as Laboratory Director at Brelje and Race Laboratories, Inc. for over 12 years has given her a strong background in quality control, quality assurance and audit preparation. Her experience in the commercial laboratory sector provides her a unique perspective as a former auditee. She served as a member of the Environmental Laboratory Technical Advisory Committee working closely with members of the State Water Resources Control Board. Jill has an eye for interpreting regulation and choosing appropriate and decisive corrective action. She holds a B.A. in Environmental Studies, with an emphasis in Water Quality, from Sonoma State University.
Auditing Services: Napa Green Vineyard, Napa Green Winery, Accredited Sustainability Auditor for California Certified Winegrowers
Matthew Hoymak
Matthew holds an MBA in Sustainable Management from Presidio Graduate School and brings over 14 years of experience in the hospitality industry as the founder and CEO of Stag Dining Group.
As a certified sustainability practitioner with the Global Reporting Initiative (GRI), Matthew has conducted audits for Fortune 500 companies, including developing waste stream and recycling strategies for NASCAR and assessing Intuit’s energy usage in commercial real estate. For the past two years, he has worked with Deep Planet AI to provide precision agronomy analysis for wine businesses, enhancing vineyard productivity and promoting regenerative farming practices. His work has also included remapping New York’s American Viticultural Areas (AVAs) in collaboration with the New York Wine and Grape Foundation and their grower survey.
Auditing Services: Napa Green Vineyard, Napa Green Winery
Sierra Minchaca
Sierra Minchaca is an independent third-party auditor for Napa Green and LODI RULES with a background in sustainable viticulture, climate-smart farming, and soil health. She previously served as Climate & Soil Specialist for Napa Green’s Vineyard Program, where she conducted vineyard irrigation evaluations, on-site Carbon Farm assessments, and supported certification processes and practice verification. Sierra holds a B.S. in Conservation and Resource Studies from UC Berkeley, advanced training in Carbon Farm Planning through the Carbon Cycle Institute, and has been trained as a Regenerative Agriculture Technical Assistance Provider through Chico State’s Center for Regenerative Agriculture.
She has also contributed to industry outreach as a Napa Green brand ambassador and through the RISE Climate & Wine Symposium, helping elevate conversations on resilience and regenerative farming. Her technical strengths include carbon farm planning, irrigation system evaluation, and sustainability metrics tracking. As an auditor, Sierra ensures compliance with program standards through thorough and objective evaluation.
Auditing Services: Napa Green Winery, LODI RULES
Megan Newhall
A Sonoma County native with over 18 years of experience in management including developing and monitoring guidelines and standards for assuring compliance with state licensure, federal regulations (OSHA, HIPAA etc.) and accreditation. Experienced in quality and internal audits of clinical services, which also involved preparing material for legal inquiries, external audit engagements and corrective action plans. Extensive experience in Human Resource Management and employment law including training, policies and procedures, employee retention, compensation and hiring practices.
B.A. in Communications.
Auditing Services: Napa Green Vineyard, Napa Green Winery, Accredited Sustainability Auditor for California Certified Winegrowers
Join us in congratulating Megan Scott (@love.dream.breathe), our Operations Director, on 6 years at @napagreen. Megan’s positive attitude and “can do” approach to problem solving has greatly contributed to the success of Napa Green and our members.
Thanks for your work and dedication to sustainability!
📸 @brianamarieweddings
📍 @trefethenfamily
#womeninwine #womeninstem #climateaction
Thanks to the @naparegister for publishing this Climate Connection contribution from @napagreen’s Vineyard Program Director, Ben Mackie (@soilrainandhope) highlighting the biodiversity @grgichhillsestate.
If you loved this article, you’ll love our Birds, Bees & Butterflies: Biodiversity in the Vineyard workshop happening today!
#climateaction #regenerativeag #regenerativeviticulture
Friday night dinner dilemma?
Order takeout from @southsidenapa using promo code DONATE and 20% of your order will be donated to @napagreen.
It’s a win: win! You get dinner and @napagreen gets funding to contribute our impactful climate action work in Napa Valley.
Order online or preorder your Fried Chicken Friday pickup for February 27, 2026. Don’t forget to pair it with Napa Green certified wine! 🍽️ 🍷
#dineanddonate #nonprofit #napavalley
Join us Thursday, February 26 to learn about biodiversity in the vineyard.
🍇 Ivo Jeramaz, Winemaker & VP of Vineyards and Production at @grgichhillsestate, will welcome us to the beautiful property and illustrate the various implementation of habitat diversity they have undertaken at the American Canyon ranch.
🍇 Jo Ann Baumgartner & Sam Earnshaw from @wildfarmalliance will provide insight on how to maximize bird habitat and establish hedgerows to support the local ecology.
🍇 Erin Arnsteen from the @monarchjointventure will outline how pivotal vineyard acreage can be to support the dwindling Western Monarch populations.
🍇 Cori Carlson, owner of @napapastureprotein, will explain the ecological goals of grazing a vineyard.
🍇 Ruby Stahel from the @naparcd will join us to discuss the various resources that the RCD has to support habitat enhancement on Napa properties.
🍇 @soilrainandhope from @napagreen will talk about bees!
➡️ Ticket link in bio.
#biodiversity #regenerativeag #regenerativeviticulture
Learn about the herd of cattle calmly grazing the vineyards @ruddestate, contributing to soil health and biodiversity, in our latest post from @soilrainandhope.
➡️ Link in bio.
#climateaction #regenerativeag #regnerativeviticulture #soilhealth
Thanks to @naparegister and @kcuz for this great article about the @regenerativeviticulture and @napagreen #OneBlockChallenge field day @celaniwines.
We had a great time engaging with attendees about opportunities to implement regenerative practices in their vineyards!
If you’re regenerative curious or want to learn more head to the link in our bio!
#climateaction #regenerativeviticulture
Congratulations on @napagreen Vineyard Certification to @shadybrookestatewinery!
Nestled in the picturesque heart of Coombsville, Shadybrook Estate, has shown a deep commitment to regenerative viticulture and climate action. Visit to see the natural beauty of this hidden gem.
#climateaction #regenerativeviticulture #napagreen
We love the biodiversity in this @grgichhillsestate American Canyon Vineyard!
Come learn how to integrate biodiversity in your vineyard on February 26 at this workshop with @napagreen, @grgichhillsestate, @wildfarmalliance, @monarchjointventure, @napapastureprotein and @naparcd.
➡️ Ticket link in bio.
#Biodiversity #RegenerativeAg #RegenerativeViticulture
Congratulations to @rutherfordhillwinery on achieving @napagreen Winery Recertification!
At Rutherford Hill Winery, sustainability is apparent in all of their practices. The facility is 100% solar-powered and even contributes clean energy back to the local grid. Additionally, they prioritize natural solutions, like Owl Boxes and organic farming.
Visit to experience for yourself these exceptional wines that invest in our planet’s future.
#climateaction #winetasting #sustainablewine
Biodiversity is essential for any resilient vineyard.
Join us on February 26, 2026 at @grgichhills American Canyon to learn how to integrate biodiversity within vineyard blocks.
Experts from @wildfarmalliance @monarchjointventure @napapastureprotein and @naparcd will be on hand to discuss all the various species that a vineyard can support.
Ticket link in bio.
#biodiversity #regenerativeag #regenerativeviticulture
Learn how @closduval used Verallia lightweight glass to help reduce their environmental impact and meet their sustainability goals.
Read more at napagreen.org
#climateaction #lightenup
What a great #OneBlockChallenge first field day!
Not only was it a gorgeous day with a great community of people we also heard from some awesome speakers:
🍇 @cainethompson about the @regenerativeviticulture foundation and the implementation practices
🍇 Jordan Lonberg @coastalvineyardcare about continuous improvement and shifting the industry mindset
🍇 @soilrainandhope about the practical aspects of the regeneratives practices and how @napagreen and @naparcd can provide support
🍇 Dustin Owen @celaniwines about their their vineyard’s regenerative journey
Thanks to all who attended and to @celaniwines for hosting!
➡️ To learn more about regenerative vineyard practices or to enroll in either the One Block Challenge or Napa Green Vineyard certification, head to the links in our bio.
#regenerativeag #climateaction
Join our first @napagreen and @regenerativeviticulture One Block Challenge Field Day to hear from this great lineup of speakers, meet other participating growers, and learn how to take the first steps in implementing regenerative practices.
We look forward to seeing you on February 12, 2026 at @celaniwines to connect learn more.
Registration link in bio.
#regenerativeag #regenerativeviticulture #soilhealth
It’s hard to believe it’s already been 3 years since @marisataylorwines joined our team, but time flies when you’re having fun (and wine)!
Join us in celebrating Marisa Taylor, who is an accomplished winemaker and sustainability leader with over two decades of experience in the wine industry, and also the Napa Green Winery Program Manager, where she partners with wineries across Napa Valley to advance meaningful environmental stewardship and sustainable winegrowing practices.
Thank you for bringing your passion and positive energy to our team every day!
The team celebrated with our @napagreen certified #NapaNeighbors @rombauervineyards.
#winebusiness #womeninwine #sustainablewine
Join us for the @napagreen and @regenerativeviticulture #OneBlockChallenge first field day on February 12, 2026 from 10-12 @celaniwines.
This event is open to all winegrowers and vintners who are curious about regenerative viticulture but space is limited so register today at the link in our bio.
#soilhealth #regenerativeviticulture
Congratulations to @domainecarneros for receiving the @napachamberofcommerce Sustainable Business of the Year award presented by @mcecleanenergy.
Thank you for your leadership, innovation and dedication to sustainability and the community!
#greenbusiness #winebusiness #napagreencertified #napagreen
