Since you're in the Houston area I'd definitely say Nerodia fasciata confluens, the Broad Banded Water Snake. These are frequently mistaken for Copperheads and/or Cottonmouths (both poisonous). Like almost all Nerodia species, the Broad Banded is generally quick to bite and often liberally spreads the contents of its cloaca over anybody who is trying to handle it.
Most individuals are obnoxious but definitely non-poisonous. The one you found is a particularly pretty one.
Aquarist since 1964