Day One is a nonprofit organization with over three decades of experience dedicated to building healthier, more equitable communities throughout the San Gabriel Valley. By collaborating with residents, youth, elected officials, and community stakeholders, Day One advances public health, promotes evidence-based policies, and drives community-level and behavioral change. The organization is widely recognized for its leadership in youth advocacy, community engagement, coalition building, and public health-focused urban planning.

Over the years, Day One has earned numerous awards, increased grant funding, and achieved significant public health policy victories that address social injustice, inequity, and the root causes of health disparities. Its skilled team specializes in community outreach, policy development, and implementing inclusive, data-driven strategies to prevent chronic disease and create vibrant, active environments for underserved populations.