SECTION 1.  Chapter 175 of the General Laws as appearing in the 2016 Official Edition is hereby amended by striking out Section 4D and inserting in place thereof the following section:–

Section 4D. (a) As used in this section, unless the context clearly requires otherwise, "residential property" shall mean a 1 to 4-unit dwelling used for living or sleeping and “liquid fuel tank” shall mean a tank in which heating oil is stored and from which heating oil is delivered or pumped through a fuel supply line to an oil burner, whether located within a dwelling or other structure, including tanks installed at or below grade level, or located outdoors but excluding underground tanks wherever located.

(b) The joint underwriting association, formed pursuant to chapter 175C, and each insurer licensed to write and engaged in the writing of homeowners' insurance shall offer the following coverage to residential owners to whom a homeowners’ insurance policy is issued or renewed: (1) first party property coverage for response action costs incurred under chapters 21E or 21K, or regulations promulgated pursuant thereto, and for property damage on the insured property caused by or in response to a release of heating oil from a residential liquid fuel tank or any piping, fuel supply lines, equipment or systems connected thereto; and (2) liability coverage for third party claims arising out of a release of heating oil into the environment. Minimum coverage of $75,000 per occurrence for first party property coverage, subject to a reasonable deductible not to exceed $1,000 per claim, and $250,000 per occurrence for third party liability shall be offered. Such minimum coverage shall be included in a homeowners’ insurance policy unless the insurer or joint underwriting association obtains a written rejection of such coverage signed by the policyholder, or the policyholder elects to purchase higher limits for such coverage that the insurer or joint underwriting association, at its option, may offer.  For the purposes of this section, first party property coverage shall include response action costs incurred to assess and remediate a heating oil release impacting soil, indoor air or other environmental media on the insured's property. Third party liability coverage shall include the obligation to defend the insured at the insurer’s expense against third party claims, and such defense obligation shall include coverage for costs incurred to investigate the source and extent of the release of heating oil.  Damages covered under third party liability coverage shall include response action costs incurred to address conditions on and off the insured's property arising from a heating oil release on the insured's property that has impacted or is likely to impact groundwater or has migrated to, or is likely to migrate to, a third party's property. First party and third party liability coverage shall apply simultaneously and, in addition to, one another when both coverages are applicable.

SECTION 2. This act shall take effect upon its passage.