Tenant wants me to waterproof a basement in PA that doesn't flood

[Kasay Mardis]

Good Afternoon,

    I have a quick question about the law requirements or type of responsibility we have as a landlord.  A tenant of ours wanted their stairs replaced, because the riser had fallen off.  Even though it didn't affect the integrity of the stairs we agreed, but finding a contractor in the winter was tough.  This made her angry and now she wants us to water proof her basement because a very small amount of water passes to the drain during heavy rains and snow melt (no standing water at all).  Are we obligated to water proof a basement when everyone gets water in their basement to prevent a small amount of inconsistent water?

Thank you,

Kasay