I had this issue with a vacation rental I purchased in Tennessee on Douglas Lake. The house was not in a flood zone but the mortgage company said it was because the report they received back from Corelogic incorrectly said it was. You could clearly see on the Flood maps that the house wasn't in a flood plain. I couldn't even get flood insurance through an insurance company without a survey showing the flood level(that didn't exist). I was able to purchase a policy on the NREIA( National Real Estate Investors Associations)Arcana Insurance. I am a member so I can just go online and purchase the insurance. I got a 250.00 policy covering a minimal amount. In my case, the mortgage company wouldn't accept this and I had to purchase a 3000.00 plan covering the maximum allowed 250,000. I had to do this to close so I did. After close, I found out that Corelogic had sent a corrected report before closing to the Mortgage company had missed it. I spent the next 6 months getting my refund from escrow and the insurance company.