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SD 179

An Act relative to liability for release of hazardous materials

194th Legislature (2025-2026) Introduced by Bruce Tarr

The bill tightens who bears liability after DEP audits by shielding eligible persons once a permanent remedy is set, while expanding what counts as a substantial release migration,

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Bill Summary · SD 179

Summary: An Act relative to liability for release of hazardous materials (Senate Docket No. 179 / Senate No. 664)

Purpose and intent

  • The bill modifies liability under Massachusetts’ hazardous materials cleanup regime (Mass. General Laws, Chapter 21E) by redefining risk scenarios and establishing liability protections for certain parties after DEP audits and remedy actions.
  • The core aim is to delineate when a party (an “eligible person”) would not be liable for “substantial release migration” and to codify penalties/defenses related to prior audits and remedy status.

Key provisions and changes

1) Redefinition: “Condition of substantial release migration” (Section 1)

  • The definition is expanded/clarified to cover a release of oil or hazardous materials that is likely to be transported through environmental media and that could cause:
    • health damage, safety hazards, or environmental harm, or
    • a substantial increase in the extent or cost of future response actions.
  • Provides concrete examples of what constitutes a “condition of substantial release migration,” including:
    • Separate-phase oil/hazardous material discharges to surface waters, buildings, or utilities.
    • Ground surface or vadose zone releases that threaten groundwater.
    • Groundwater releases migrating more than 200 feet per year.
    • Groundwater releases likely to be detected within 1 year in wells, surface waters, wetlands, or reservoirs.
    • Vapor intrusion concern: vapors discharging into schools, daycares, or occupied residences at concentrations above indoor air thresholds, with specific criteria (soil gas VOCs near structures; groundwater VOCs near structures; presence of LNAPLs; vapor migration pathways).
    • Any release for which a department-required notification has been issued.
  • Affected activities include required DEP notifications and mandated response actions.

2) Addition: “Critical exposure pathways” (Section 2)

  • Creates a new term defining the main routes by which released materials reach human receptors, specifically:
    • Vapor-phase emissions into living/working spaces (pre-schools, daycares, schools, occupied homes) exceeding indoor-air thresholds.
    • Ingestion, dermal absorption, or inhalation of contaminants from drinking-water wells serving those sensitive facilities or residences.

3) Conclusive evidence of no liability for eligible persons (Section 3)

  • Adds a subsection (l) to Section 5C:
    • If a DEP audit of response actions at a site (or portion) results in a permanent remedy status and maintenance in line with a cleanup opinion, the eligible person is conclusively deemed to have no liability for releases at properties not previously identified as part of the site, and the DEP may not take action against them for those properties.
    • DEP cannot promulgate regulations to override this provision.

4) Liability protections for eligible persons and pre-audit status (Section 4)

  • Creates a liability shield for substantial release migration at properties not previously linked to a disposal site if:
    • DEP, before the act’s effective date, audited response actions at the site.
    • DEP determined that a permanent solution/remedy operations status was achieved and maintained, or notified of a violation that was promptly corrected.
  • Specifies that the DEP cannot use this section to defend or contest liability; the department has no defense in actions showing a permanent remedy status.

Who is affected

  • Eligible persons (as defined by waste-site cleanup frameworks) who have conducted DEP-required audits or remediation.
  • Property owners and operators of disposal sites, developers, and entities involved in releases who might rely on remedy status.
  • Massachusetts Department of Environmental Protection (DEP), which would administer the new definitions, audit expectations, and liability determinations.
  • Public and private water users and occupants of schools/daycares/residences potentially affected by vapor intrusion or groundwater transport.

Procedural and timeline notes

  • The bill amends Chapter 21E, the Waste Site Cleanup Act, and would apply prospectively to new and ongoing cases, with a notable provision allowing pre-enactment DEP audits to inform liability shields.
  • Status: Introduced November 29, 2025 (Bill version indicates filing in January 2025 as Senate Docket No. 179/Senate No. 664); status on the current Legislature is not provided here.

Summary takeaway

This bill strengthens protection for certain “eligible persons” after DEP audits and established remedy status, while expanding the criteria for what constitutes a substantial release migration (including detailed vapor intrusion and groundwater thresholds). It creates explicit liability shields for properties not previously identified in a disposal site, contingent on DEP audit outcomes and cure of violations, and it codifies key exposure pathways to ensure regulators consider vapor intrusion and drinking-water pathways in evaluating risks.

Compiled from official sources — confirm details with the bill’s official record.

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