So I found a small commercial building in a small town that has a well and septic system that I thought about purchasing and putting a petwash in. I had a brief discussion with the EPA and got the feeling that their typical answer for these type of situations if you have to install a new septic system if it is very old just for the hell of it. Problem is the lot I am looking at has no room to start replacing the septic system due to the very large leach field they now require. I thought about just getting a holding tank and just pump it out periodically. Problem is I assume the water would be hazardous waste at that point and would require special licensed haulers and have to dump at some licensed facility. Does anyone have any experience with anything like this that can offer some insight?