Drilling a new residential well is fairly simple and straight forward. 

There are a few state requirements for a new residential well:

1) 50 Feet from property line, unless grouted/cemented from the top of the water production screen to ground level.

2) 100 Feet from any Septic, including drain fields or sprinkler systems.

Public wells require quite a bit of paperwork and planning from the state of texas.

They also require a 3rd party engineer to monitor drilling activity to ensure it is done to state rules.

Irrigation wells also require quite a bit of paperwork, and depending on county and even times of year limit the amount of water you can produce.