From Quaker farmland to a tripled population, basements followed
Westfield's 1834 Quaker settlers built on farmland that stayed largely undeveloped for well over a century, so when the town's population roughly tripled between the 2000 and 2010 census counts, most of its basements were dug during that same recent boom — into the same Hamilton County glacial till and Crosby-Brookston clay-loam soils that hold water and expand seasonally across the whole Carmel area.
Grand Park-area growth means consistent grading, inconsistent drainage
The rapid subdivision growth around Grand Park Sports Campus means many Westfield basements are similar in age and construction, but grading and exterior drainage quality still varies lot to lot — a sump pump or interior drain system that works for one house on a block doesn't guarantee the neighboring foundation was graded the same way.