The department, and its employees designated for the purpose, shall enforce sections 1 to 7, inclusive, and the rules, regulations and orders made thereunder, and may enter into any building, and upon any land for the purpose of ascertaining whether sources of pollution there exist, and whether the sections and the rules, regulations and orders made as aforesaid are complied with.
Mass. Gen. Laws ch. 92A 1/2, § 8