TCEQ permit or license needed?

Well everyone business has been getting a little better and I’m to the point where I have the funds to start pressure washing. I bought a 4gpm 4000psi presssure washer, trailer, tanks and some chemicals. Im also was going to start a mobile wash for trucks/fleets.
Now here’s my question, do I need any permits or licenses from the "Texas Commission On Environmental Quality"to do any of this? Including in the mobile wash area.
I know it may differ from state to state but id like to hear what maybe some of you do know about this. I know there is some knowledgeable people in this forum and I’m hoping to get some good replys.
Thanks Felix