105 CMR, § 400.015
Unless otherwise expressly provided in any other article, the legally designated health authority of any city, town, country, or other legally constituted governmental unit within the Commonwealth having the usual powers and duties of the board of health may, as it considers necessary to promote and protect the health and well being of the particular locality under its jurisdiction, adopt under its own legal power as exists in the General Laws any rules or regulations containing requirements stricter than those contained in the State Sanitary Code. Nor should the existence of the State Sanitary Code limit or otherwise affect the power of any health authority with respect to any matter for which the State Sanitary Code makes no provision.
105 CMR, § 400.015