This is a bizarre warning. While yes, West Chester does reside in that greater region, it’s not even close to the Delaware River.
The Brandywine River runs through the area and is quite prone to flooding in some places, but not so much I’d feel the need to forewarn people about it. Maybe if I saw on a map that the paddocks of a potential property butted up to the Brandywine…
Mud gets bad in a lot of that region of the mid-Atlantic, but consistent turnout is generally not a problem. Drive around and you’ll see horses turned out everywhere.
West Chester, PA is horse heaven, OP. You’ll have no problem finding what you’re looking for in a short drive. The price range is tight for West Chester proper, but if you’re willing to drive 30 minutes north, south, or west, you will have no problem finding something. Seriously, there are so many options it’s ridiculous to try to list them all!!!