I know for sure there aren’t any in Sotuh Texas. The university, club, and high school pools are only 25 mts, to get to the closest olympic size pool that’s actually 50 mts people have to cross to Mexico. A lot of of the swimming events from South Texas here are held in Mexico because there just isn’t an olympic size pool in the Rio Grande Valley area.
http://www.swimmersguide.com/
Here you can find any pool that could be in your area.
The sizes of the pool is in the results in parentheses.
I donno where in south texas you live
but SMU in dallas has a olympic size pool and so does Lowes Complex in addison
im sure theres some down there
i use to live in arlington and we would swim there all the time