- Friends of the Foothills - Group dedicated to conservation of remaining open space in south Orange County.
- Naturalist for You - Non-profit, public benefit corporation conducting programs on publicly-owned land, such as the national forests, state parks, and county parks. Programs, places and calendar.
- OC Watersheds Program - Presented to raise awareness of water-quality issues. Offers information on rainfall, weather, watersheds, stormwater projects, and pollution.
- Sea and Sage Audubon Society - Meetings, events, field trips, conservation issues, birding information. On the grounds of the San Joaquin Wildlife Sanctuary.
