Capitol Region Council of Governments (CRCOG) provided the Troubleshooters with aggregated data from various sources on crumbling foundations in Connecticut.
CRCOG compiled information from municipal officials, the Department of Consumer Protection, the Connecticut Insurance Department and in one case, an engineer who does home inspections.
The group notes a home could be reported to more than one source. As a result, it takes an average number of homes reporting crumbling foundations from all of its sources.
If the average is larger than the number of homes municipal officials (town assessors, first selectmen, etc) provide, CRCOG uses its own estimate. However, if the average is equal to or smaller, the group chooses the municipal officials' numbers.
NBC Connecticut's map is plotted using CRCOG's estimated numbers of affected homes.