A new TPWD policy (or guideline -- it's unclear yet which it is) for apparently all Texas state-run parks is that geocache owners must register with the park's office before placing geocaches on park premises. The most notable example of this are the caches at
Enchanted Rock SNA which have apparently been confiscated and will be held until the owners register at the park office.
On a related note, in mid-2004 I specifically wrote to TPWD (via their website) inquiring about any policies they might have in regards to geocaching, similar to the policies the National Park Service has established. I received no response. I guess my inquiry was a year too soon.
There are presently no geocaching related policies publicly listed on TPWD's website. In the event those are published, I'll share that information here.
For more information on geocaching in general, visit
http://www.geocaching.com/faq. For information on geocaching in Texas, specifically, visit the
Texas Geocaching Association.