Mols Issue Not Previously Disclosed

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I recently bought a rental property. The city inspector showed up to put power on the property and stated the house was shut down in 2016 for a mold issue. I talked to the realtor that sold the property and he stated he did not know anything about it, and it was not on any disclaimers for the house at purchase. I have not seen any mold and I know why there potentially could have been mold. Rain water is flowing under the house into the crawl space. Is this something worth looking into on a legal side, or not worth my trouble and just fix it and move on? I have not contacted the city to verify if the previous owner signed any paperwork knowing that there was a mold issue. I wanted to ask a question first before I start digging into the weeds to much.