Here in Maine, each system has to be designed by a licensed site evaluator, controlled by the state. This is something that became mandatory in the 70's. Licencing isnt required to install, but most proprietary systems require some sort of certificaiton for their system I believe. A permit needs to be pulled for each system at the town and the name of the contractor and/owner is filed and then it is filed at the state also in the health department. Before that anyone could bury anything in the ground and call it a septic system. I purchased this house a year ago and didnt pay much money for it. Nobody could tell me where the septic system was or when it was last pumped. The entire yard looked like a jungle and it was difficult to tell what was there. The toilet flushed and worked for now but I knew there was no way that this was a decent system. I bought the house as is with no inspections to get the price down. I rolled the dice that the septic would work until I got it replaced, which was at the top of the list. AND, this was another project to justify a new tractor! Once the acreage was bushogged, i realized that there was no "leachfield" There was just a daylight pipe for effluent after the tank over at the corner of the lot. This system works in that there is no leach field to clog up and back up into your house but its not right, even though this had been going on for 50 years and noone has said anything. I'm a residential builder by trade, so I knew exactly what I was getting into. No one is making me (town or state) fix the "system", its just the right thing to do. Personally or professionally, I cant let this go on any longer. Also, my neighbor built a house 3 years ago adjacent to the property line which the "leachfield" is. In the previous years there was nothing in that direction and much harder to contaminate ground water. Now, its amazing no one has gotten sick. Im looking forward to this project for many reasons.