US lawMassachusettsRegulations105 CMR — Department of Public Health105 CMR 164.00 — Licensure of substance use disorder treatment programs164.402105 CMR 164.402Hours of OperationYear: 2026Length: 16 wordsOfficial source Residential rehabilitation services shall operate 24 hours per day, seven days per week, 365 per year.Previous105 CMR 164.401Next105 CMR 164.404