Hi...If you bought your home in 2006 & have a mortgage, you would have to either have had a survey completed or a survey approved by your mortgage company that may have been the previous sellers within 10 yrs. & no new improvements were made. You should have received a copy when you closed. If you didn't or can't locate it, try your closing attorney, they may have it or your mortgage company. Possibly even the title company. If you find the survey, it should show the location of the septic & the well. If not, then you certainly can check with the town, although many don't have records prior to the past 10 yrs. or so. You can also hire a septic company to locate the septic & a well company to locate the well. They have various ways of doing that including some electronic devices. This will cost several hundred dollars. I bet though that survey may be tucked away with all the documents you sign at closing, so check there first. Good Luck!