Pyrrhotite The Crumbling Foundation Crisis in Massachusetts

There is a silent threat lurking inside the concrete foundations of many homes in Massachusetts—one that many prefer not to talk about. Often called the “elephant in the room” of the real estate industry, this hidden danger is pyrrhotite. While the issue has been well-documented in some towns in Connecticut, research shows that pyrrhotite is also affecting homes in Massachusetts, compromising foundation integrity and posing serious financial and structural risks.

What Is Pyrrhotite?
Pyrrhotite is a naturally occurring iron sulfide mineral found in certain concrete aggregates. When exposed to moisture and oxygen, it undergoes a chemical reaction that causes the concrete to expand and crack over time. This degradation compromises the structural integrity of foundations, leading to significant damage in affected homes.

Extent of the Problem
As of mid-2025, at least 43 towns in Massachusetts have reported homes with crumbling foundations due to pyrrhotite contamination. The issue primarily affects homes built between the early 1980s and the mid-2010s, especially those constructed with concrete from quarries known to contain pyrrhotite.

Experts estimate that as many as 35,000 homes built between 1983 and 2015 in the northeastern part of the state could be affected. The state believes thousands of homes—perhaps as many as 7,500—across central Massachusetts are at risk.

Financial Impact
Repairing or replacing a pyrrhotite-affected foundation can cost between $150,000 and $250,000, often exceeding the home's market value. Many homeowners face financial hardship as insurance policies typically do not cover these repairs.

State Response
In July 2025, Massachusetts established the Crumbling Concrete Stakeholder Working Group to address the issue. This group, under the Executive Office of Housing and Livable Communities, includes legislators and representatives from housing, transportation, and consumer affairs. Their goal is to develop comprehensive solutions for homeowners affected by crumbling foundations.

What Homeowners Can Do

• Testing: If you suspect your home has a pyrrhotite-affected foundation, consider conducting a core sample test. Massachusetts offers a reimbursement program for testing costs.

• Legal Assistance: Consult with legal professionals to explore potential compensation or remediation options.

• Stay Informed: Join local advocacy groups, such as Massachusetts Residents Against Crumbling Foundations, to stay updated on legislative developments and support efforts for assistance.