Many homeowners discover problems after moving in, but hidden water issues create some of the most serious financial stress. A basement that floods during rain can damage property, lead to mold growth, weaken a home’s structure, and reduce a property’s market value. When a seller fails to disclose a known flooding problem, it raises questions about legal responsibility. Every state requires sellers to follow certain disclosure rules, and many require sellers to report any known water intrusion. Because laws vary, the best approach involves understanding what counts as “known”, what counts as “concealed”, and what legal options become available when a seller keeps problems quiet.