Not a great picture for an identification lol. From the pattern, I would say it is a Diamondback Water Snake (Nerodia rhombifer). They are the most abundant water snake in Texas. They are non-venomous but they stink, and like most water snakes, they have a bad disposition. That means they will bite you every chance they get.
FIFY- there isn't a single poisonous snake in the world that I'm aware of.
Blah ha. Ha ha ha.
Actually you didn’t FIFY (FIX it for me), you just changed the meaning. Since the difference between poisons and venom is the delivery system, you are correct that the snake is non-venomous. However, if I eat it or rub it on my skin, I would not absorb any toxin so it is non-poisonous. I guess I could have said it was a non- proteolytic, hemotoxic,neurotoxicity, cytotoxic injecting species, but some people on this site already think I am too technical lol.
As for your comment: “there isn’t a single poisonous snake in the world that I’m aware of.” That statement may be correct, since I can’t ascertain what you know without more research,. However, I propose that a snake could be poisonous. If you eat an Inland Taipan, often considered the most venomous snake in the world, and you have an ulcer, you could absorb enough toxin to make you ill. Therefore it would be poisonous.
All in good fun.