Tenant Flood Damage - Who's Responsible?

[Jon Fletcher]

My ground floor tenant had minor water damage after Ida ripped through NY on September 1st. He's asking me to compensate him for the cost of a couple of furniture pieces. My question is; who is responsible to pay for the damage? Me as Landlord? Or Tenant through his renter's insurance? The water came up through a storm drain and infiltrated the apartment.