If, after May 7, 1986, a customer served by a private line permits another customer, premises or person to be served from the private line, the line shall be subject to the water main provisions of this rule. If the utility determines that this line must be modified or replaced in order to meet its specifications or to provide adequate capacity for reasonably anticipated future growth, the utility shall invest in the line, unless it has chosen to make no investments pursuant to 35 M.R.S.A. §72-A, and the customers served by the line shall provide a contribution as required by section 3 or 4. Any private line which will continue to be used as a main shall be conveyed to the utility without charge. All mains shall be owned and maintained and replaced by the utility as provided in section 2(A) and the utility shall be provided all necessary easements. Refusal or failure to comply with the requirements stated herein or failure of the unauthorized connecting person to voluntarily disconnect shall be grounds for disconnection pursuant to chapter 81, § 2(A)(3), provided that the utility shall give 60 days notice prior to the proposed disconnection and payment of contributions shall be subject to payment arrangements under section 5 of Chapter 81, not to exceed one year in length. A person who disagrees with the utility about the proper size of any main or the need to modify or replace a private line may refer the matter to the Commission staff and Commission pursuant to Section 6(D).
If a utility under this rule, before or after its amendments effective May 7, 1986, has allowed a private line to be constructed when it prudently should have required a main extension, or, if after May 7, 1986, it has authorized connection of a second or subsequent customer to a private line constructed at any time, and if a main extension is built subsequently, customers connecting to the main extension shall be required to make customer contributions only in the amount that would be required if the customers served by the private line were required to connect and contribute to the extension. The utility shall pay the customer contribution of and investment amount for the customers who continue to be served by the private line unless those customers connect to the main extension.
If a utility reasonably believes that the lines and grades of a private street may not be approved by a municipality or other public authority it may refuse to invest in the water main extensions in the private streets until lines and grades have been established by the public authority and the street has met those standards, as determined by the utility or the public authority. Upon compliance with those standards, as well as the utility's construction standards, the utility shall make investments for each customer previously connected for a period of ten years following connection of the first customer.
If the demand for water expected from the customers to be served by the extension requires existing mains leading to the extension to be replaced or supplemented by parallel mains, or requires booster pumps or other appurtenances in order to satisfy the demand or to maintain adequate pressure along the extension or along the main leading to the extension, a reasonable portion of these costs shall be included in the price of the water main extension. In determining a reasonable portion the utility shall consider whether the need for new replacement or parallel facilities is caused entirely by the customers to be served by the main extension; the age of existing facilities and the need for replacement for other reasons; the marginal cost of providing the additional capacity if existing facilities need present replacement or replacement in the near future; any increases in the quality of service to other customers by the addition or replacement facilities; and, in the case of a review pursuant to section 6(D), the prudence of the utility in determining the amount of existing capacity.
65- 407 C.M.R. ch. 65, § 2