Depends, I reckon, on the particular location. In certain City Limits, Municipalities, etc, local regulations may apply.
Then you've got the state to contend with. Most states don't want any wastewater seeping into the ground.
Lastly, the wonderful EPA steps in. There you find a host of regulations regarding wastewater getting into the ground water.
In short, while a particular city may not be concerned with it, somebody's always on your a$$.
Avoid any complications, and reclaim your wastewater. Try to get by with whatever you will, but rest assured, they will eventually catch up w/you. First time, a hefty fine. Second time, likely revocation of lisence to practice business. Third time, criminal prosecution.