What is the difference between Title 5 and Duxbury Rules & Regulations?

The State Environmental Code Title 5: Minimum Requirements for the Subsurface Disposal of Sanitary Sewage, or just Title 5, is a state code.  Massachusetts General Law, Chapter 111, Section 31, allows the local board of health to adopt regulations that are more stringent than the state code.  In Duxbury these are called Duxbury Rules & Regulations.  A copy of Duxbury Rules & Regulations can be obtained from the Duxbury Board of Health.