Mass. Gen. Laws ch. 272, § 86D: Pails of water and sand in buildings used for stables

Section 86D. On every floor of a building not equipped with an automatic sprinkler system, where horses or mules are stabled, there shall be kept in accessible locations and filled at all times, four pails of water and one pail of sand, for each one thousand square feet of floor space, to be used for no other purpose than extinguishing fires and to be so marked.