Mass DEP Title 5 Information
http://www.mass.gov/eea/agencies/massdep/water/wastewater/septic-systems-title-5.html
Mass DEP Buying or Selling a home with a Septic System
http://www.mass.gov/eea/agencies/massdep/water/wastewater/buying-or-selling-property-with-a-septic-system.html
Looking for a State Licensed Septic Inspector
http://www.mass.gov/eea/agencies/massdep/water/wastewater/approved-soil-evaluators-and-system-inspectors.html