Any municipality may appropriate funds to extend or cause to have extended water mains (1) into areas to be used for industrial or commercial purposes or partly for industrial or commercial purposes and partly for residential purposes, or (2) into residential areas or into areas zoned for residential use. Notwithstanding the provisions of any special act, the municipality may pay the cost of such extension or may require each owner of property which abuts any such main to reimburse the municipality such owner’s proportionate share of the cost of such extension at such time and by such rule as the municipality by ordinance determines. Whenever the municipality and the Commissioner of Energy and Environmental Protection may concur in determining the need for such extension in response to a community pollution problem, as defined in section 22a-423, or in response to a bacterial contamination problem, the municipality may waive any such reimbursement to the municipality. In the case of land zoned for other than commercial or industrial purposes or classified, pursuant to sections 12-107a to 12-107e, inclusive, as farm land, forest land or open space land, on the last-completed grand list of the municipality in which such land is located, which exceeds by more than one hundred per cent the size of the smallest lot permitted in the lowest density residential zone allowed under zoning regulations, or in the case of a town having no zoning regulations, a lot size of one acre in area and one hundred fifty feet in frontage, assessment of such excess land shall be deferred until such time as such excess land shall be built upon or a building permit issued therefor or until approval of a subdivision plan of such excess property by the planning commission having jurisdiction, whichever event occurs first, at which time assessment may be made as provided in this section. The municipality shall place a caveat on the land records in each instance where an assessment is deferred. Such share shall represent a reasonable proportion of the total cost of such water mains, including materials, installation, pumping stations, service connections, curb, sidewalk and highway repairs and the cost of installation of gate-valves or shutoffs, if any; except that, if residential or agricultural property or property zoned for residential or agricultural use abuts lines of construction of water mains to be used for industrial or commercial purposes or partly for industrial or commercial purposes, and such property is not being used for such purposes, the proportionate share of the owners of such property shall be computed on a front-foot or other equitable basis for a standard or minimum size main. Such shares shall be proportioned in such a way as to ultimately leave the municipality free of any of the cost of the extension of the water main and expenses incidental thereto, except where any portion of such water service is to be used for a municipal purpose in which instance the municipality shall contribute a fair proportion of the expense representing such proportionate municipal share. Within sixty days of an assessment under this section, the owner of any property so assessed may appeal to the superior court for the judicial district within which such land is situated from the valuation of his assessment, by service of process made in accordance with the provisions of section 52-57. Such appeal shall be a privileged case and shall not stay any proceeding under this section. The court shall have the power to grant such relief as to justice and equity appertains, upon such terms and in such manner and form as appears equitable.