Any municipality may, upon approval by its legislative body or in any town in which the legislative body is a town meeting, by the board of selectmen, abate for a period of up to ten years all or a portion of the property taxes due on and after July 1, 1997, for property owned by an entity that has acquired a water company pursuant to the provisions of § 16-262o. The acquiring entity shall only be entitled to an abatement for those costs incurred by such entity to make improvements on the infrastructure and related property of the acquired water company, when such improvements were ordered by the Public Utilities Regulatory Authority or the Department of Public Health and necessary in order for the entity to provide continuous, adequate water service.