Your membership helps support our conservation efforts. We rely on the support and donations of people like you who understand the necessity of protecting our cave and karst resources. Additionally, we are a 501(c)(3) nonprofit, so your membership and donations are tax-deductible.

Be sure to check our calendar and social media for upcoming events and opportunities. Many of our preserves even have a specific group for that cave, like Friends of Deep & Punkin and Friends of Robber Baron, which are great to join if you’re interested in helping out at a specific cave.

If you prefer to register offline, you can print our membership form, fill it out, and mail it to:



2186 Jackson Keller Road, #533
San Antonio, TX 78213

You can support the TCMA while you shop on Amazon. It’s easy and free!

Just click any of our Amazon Affiliate links on our site, then select and buy your products on Amazon, and Amazon will contribute 6% or more of your purchase to the TCMA. It doesn’t cost you anything extra and is a huge benefit to the TCMA.