Theo's right. In TX your ground water should be at least in the upper 60's depending on what part of the state you are in. If you're not sure, typically your ground water is about the same as your average annual temperature. Mine is 53 and my ground water is 51.6.

If you got a heater with a thermostat it may not take much to warm your water up a few degrees.

If pigs could fly bacon would be harder to come by and there would be a lot of damaged trees.