Protecting Our Wetlands
Preserving our futureDedicated to the stewardship, restoration, and expansion of wetlands and associated wildlife habitats by preserving our future through classroom and field education that inspires youngsters to become stewards of our wetlands.
Petaluma Wetlands Alliance
We support Shollenberger Park, Alman Marsh, Ellis Creek Wastewater Treatment property, and future wetland sites in the Petaluma River watershed. We work with local governments, environmental organizations, and other groups to educate the public about the ecology and value of wetlands.
Photography courtesy of Bob Dyer, Tim Fleming, Gerald Moore, Len Nelson, Thomas Reynolds and Ron Storey
About Petaluma Wetlands Alliance

What is PWA?
Petaluma Wetlands Alliance (PWA) was formed by a concerned group of citizens who banded together in the late 1990’s during the planning and construction of a new wastewater treatment plant in Petaluma, California. We work with schools, government agencies and environmental organizations to help preserve wetlands habitat.

What are Wetlands?
Wetlands are among the world’s most productive ecosystems, providing critical habitat for many plant and animal species. In essence, wetlands are the zones between the land and large bodies of water such as rivers, lakes, or oceans, where water tends to stand for prolonged periods of time. Swamps, marshes and bogs are all examples of wetlands.

How Can I Help?
We’re glad you asked! There are a number of ways you can support the PWA. Financial contributions are always welcome. Since we are a 501(c)(3) organization, your donation may be tax-deductible. If you like to meet and talk with people, check out our our docent program. Or, pick up a shovel and come help us remove invasive weeds as a volunteer.
Latest News
From the editors at Petaluma Wetland Alliance
Tribute to Andy LaCasse
In Memory of Beloved PWA Member Andy LaCasse (1942-2022) by Len Nelson, Research Chair Without the inspiration, insights and education I absorbed from Andy Lacasse, I would not be doing the research and bird monitoring work that absorbs and enriches my life (and...
Monitoring Herons & Egrets at Ellis Creek
Photo of Linda Sheppard & Len Nelson By Mary Kadri Among the several pleasures of volunteering with Petaluma Wetland Alliance, and then volunteering to help lead researcher Len Nelson, is that I had a chance to get exclusive access to the gated community of...
Riding with the Researcher
One of the first things Len Nelson, lead bird researcher, will tell you if you ask to go along on one of his birding trips, is “I hope you don’t have a time limit.” Take my word for it, clear your calendar for the day, it will be worth it! I recently had the privilege...
How You Can Help Right Now
