Is My Town Affected?

About pyrrhotite in New England

Pyrrhotite is an iron sulfide mineral found in certain aggregate quarries. When used in concrete foundations and exposed to water and oxygen, it slowly expands and causes the concrete to crack and crumble — a process that can take 10 to 30 years to become visible.

The primary source of pyrrhotite-contaminated concrete in Connecticut was the Becker's Quarry in Willington, CT, which supplied aggregate to concrete producers serving much of northeastern Connecticut from roughly 1983 to 2015. Homes within a 20-30 mile radius of the quarry are at highest risk, but pyrrhotite-affected foundations have been reported across the state.

Connecticut — Confirmed Hot Spots

Connecticut has the most well-documented cases, tracked by the Connecticut Coalition Against Crumbling Basements (CRCOG) and the Connecticut Foundation Solutions Indemnity Company (CFSIC). The state now estimates ~35,000 homes, condominiums, and municipal buildings are potentially affected. As of March 2026, CFSIC had deployed roughly $190 million and remediated 1,500+ homes. The CFSIC payment cap is $205,000 (standalone, since January 20, 2026), and the application deadline is 5:00 PM on June 30, 2030.

Heavily affected towns include: Ashford, Bolton, Brooklyn, Columbia, Coventry, Ellington, Mansfield, Somers, South Windsor, Stafford, Tolland, Union, Vernon, Willington, and surrounding communities in Tolland, Windham, and Hartford counties.

Case counts are from CRCOG data. Verify specific town counts via the interactive map above. Last updated: June 2026.

Massachusetts — Confirmed Towns (Its Own Geology)

Massachusetts is not simply Connecticut spillover. Much of central and western Massachusetts sits over native sulfide-bearing (pyrrhotite-bearing) rock formations, and the state has confirmed affected homes across dozens of towns. The specific source or sources of the contaminated aggregate used in Massachusetts are still being identified — research has found at least one affected Massachusetts foundation to be geologically distinct from the Connecticut material. Massachusetts does not yet maintain a centralized public case count.

Massachusetts towns with known affected homes (52, per MASSRACF as of March 15, 2026): Agawam, Ashburnham, Athol, Auburn, Barre, Belchertown, Berlin, Boxford, Brimfield, Brookfield, Charlton, Dracut, East Brookfield, East Longmeadow, Fitchburg, Gardner, Grafton, Hampden, Holden, Holland, Hubbardston, Hudson, Leicester, Leominster, Longmeadow, Ludlow, Marlborough, Mendon, Monson, Oakham, Orange, Oxford, Palmer, Paxton, Princeton, Rutland, Shrewsbury, Southwick, Spencer, Springfield, Sterling, Sturbridge, Templeton, Wales, Ware, Warren, West Boylston, Westborough, Westminster, Wilbraham, Winchendon, and Worcester.

Rhode Island & New Hampshire — Watch Zones

Rhode Island and New Hampshire share the same geological formations that produced pyrrhotite-bearing rock in Connecticut. As of this writing, neither state has confirmed residential hot spots. These are designated watch zones — areas where homeowners should be aware of the issue and include a pyrrhotite check in any foundation inspection, but where confirmed residential cases have not been publicly documented.

What to do if your town is on the map

1. Don't panic. Pyrrhotite damage takes years to develop. Early detection gives you options.
2. Look for signs. Read our 7 warning signs guide and inspect your foundation.
3. Get tested. Learn how to test your foundation for pyrrhotite before you take any action.
4. Stay informed. Sign up for our newsletter below — we track policy changes, funding updates, and deadlines.