Agents and employees of the Department may make such inspections of property, facilities or operations owned or controlled by persons subject to M.G.L. 21G and 310 CMR 36.00 as the Department may determine are necessary to carry out its responsibilities under M.G.L. c. 21G. Any person subject to 310 CMR 36.00 shall allow such agent(s) or employee(s) free and unrestricted access at reasonable times to examine any property, facility, operation, equipment or activity involving the withdrawal of water. Such agent(s) or employee(s) may also inspect, conduct tests, and review books, papers and records pertinent to any matter determined by the Department to be relevant to the administration or enforcement of 310 CMR 36.00.
310 CMR, § 36.39