Mass. Gen. Laws ch. 40, § 4K
(a) As used in this section, the following words shall, unless the context clearly requires otherwise, have the following meanings:—
''Advisory committee'', the statewide public works municipal mutual aid advisory committee established in subsection (d).
''Agreement'', the statewide public works municipal mutual aid agreement established in subsection (b).
''Employee'', a person employed full-time or part-time by a governmental unit, a volunteer officially operating under a governmental unit, or a person contractually providing services to a governmental unit.
''Governmental unit'', a city, town, county or district, however constituted, or water or sewer commission established under the provisions of chapter 40N or any other general or special law.
''Mutual aid assistance'', cross-jurisdictional provision of services, materials or facilities from 1 party to another when existing resources are, or may be, inadequate.
''Party'', a governmental unit that has joined the agreement.
''Public works incident'', a foreseeable or unforeseeable event, emergency or natural or manmade disaster that affects or threatens to affect the public works operations of a governmental unit.
''Requesting party'', a party that requests aid or assistance from another party pursuant to the agreement.
''Sending party'', a party that renders aid or assistance to another party under the agreement.
(c)
(1) If a city or town wishes to join the agreement, the mayor in the case of a city, the city manager in the case of a Plan D or Plan E city, or the town manager, town administrator or chair of the board of selectmen upon approval by a majority vote of the board of selectmen, may act on behalf of the city or town to join the agreement by notifying the advisory committee in writing. The municipality shall be a party to the agreement 30 days after receipt by the advisory committee of the written notification.
If a city or town has joined the agreement but wishes to opt out of the agreement, the mayor in the case of a city, the city manager in the case of a Plan D or Plan E city, or the town manager, town administrator or chair of the board of selectmen upon approval by a majority vote of the board of selectmen in the case of a town, may act on behalf of the city or town to opt out of the agreement by notifying the advisory committee in writing. The removal of the municipality from the agreement shall take effect 10 days after receipt by the advisory committee of the written notification.
(2) If a governmental unit that is not a city or town wishes to join the agreement, the chief executive officer of the governmental unit may act on its behalf to join the agreement by notifying the advisory committee in writing. The governmental unit shall be a party to the agreement 30 days after receipt by the advisory committee of the written notification.
If a governmental unit that is not a city or town has joined the agreement but wishes to opt out of the agreement, the chief executive officer of the governmental unit may act on its behalf to opt out of the agreement by notifying the advisory committee in writing. The removal of the governmental unit that is not a city or town from the agreement shall take effect 10 days after receipt by the advisory committee of the written notification.
(3) If a governmental unit in a state contiguous to the commonwealth wishes to join the agreement, the governmental unit may join the agreement by notifying the advisory committee in writing. The governmental unit shall be a party to the agreement 30 days after receipt by the advisory committee of the written notification.
If a governmental unit in a state contiguous to the commonwealth has joined the agreement but wishes to opt out of the agreement, the governmental unit may opt out of the agreement by notifying the advisory committee in writing. The removal of the governmental unit from the agreement shall take effect 10 days after receipt by the advisory committee of the written notification.
(d) There shall be a statewide public works municipal mutual aid advisory committee to consist of the secretary of public safety and security or his designee, who shall serve as chair of the committee; and 1 member appointed by the secretary of public safety and security from each of the following: the Massachusetts Highway Association; the New England Chapter of the American Public Works Association, who shall be a resident of the commonwealth; the New England Water Environment Association, who shall be a resident of the commonwealth; the Massachusetts Tree Wardens' and Foresters' Association; the Massachusetts Water Works Association; and the Massachusetts Municipal Association.
The advisory committee shall develop procedural plans, protocols and programs for intrastate and interstate cooperation to be used by public works agencies in response to a public works incident. The advisory committee shall be responsible for the administration and coordination of the statewide mutual aid agreement. The advisory committee shall develop and make available to parties forms to facilitate requests for aid, including a form to track the movement of public works equipment and personnel.
(f)
(h)
(ii) be considered similarly licensed, certified or permitted in the requesting party's jurisdiction if the employee holds a valid license, certificate or permit issued by the employee's governmental unit; and (iii) receive the same salary, including overtime, that they would be entitled to receive if they were operating in their own governmental unit. In the absence of an agreement to the contrary, the sending party shall be responsible for all such salary expenses, including overtime.
[There is no subsection (i).]