This is something that is not required to be disclosed UNLESS someone asks. If asked, the seller is required to answer to the best of their knowledge.
There are several other issues which aren't required to be disclosed unless specifically asked about, and your real estate agent should be able to assist you in those matters.
Given that this house is not for sale, it may be difficult to discover an accurate answer. The advice to check online data is good.
Lots of luck in your search!
Principal Broker, REALTORÂ®
MacDuff Realty Group, LLC