The following are Massachusetts State laws and regulations that may be cited in hoarding situations. 

MGL Chapter 111 are general laws related to Public Health

MGL Chapter 148 are related to Fire Prevention

MGL Chapter 272, Section 77 is related to cruelty to animals

The State Sanitary Code

Safety Codes Related to Hoarding:

Other legal information:

MA General Council Opinion-FD request for sanitary code inspection
Massachusetts Legal Services