Pyrrhotite foundations
From roughly the early 1980s through the mid-2010s, concrete supplied from a quarry in nearby Willington contained pyrrhotite, an iron sulphide mineral that reacts with water and oxygen and causes foundation walls to crack and deteriorate, typically ten to thirty years after the pour. Vernon is among the most heavily affected towns. The state created the Connecticut Foundation Solutions Indemnity Company to help fund repairs, and sellers must disclose known issues.

