The town building department will have more up to date information and is more reliable then any flood map. Call them...and then call me...I will be happy to help you. Port Jervis is an area where you can find some real good buys and many homes are not in the flood areas.
I have a home for sale ON THE RIVER, on HIGH STREET...off the flood plain, over the 100 year flood mark and with beautiful panoramic views of the pennsylvania ridges and up and down river views ...google 15 HIGH STREET, PORT JERVIS,NY and you can see the pics...
Any agent who is familiar with the Port Jervis area will be able to give you an idea of what areas are prone to flooding and which ones haven't. There are many homes in Port Jervis that are a great buy and not even close to being in a flood zone. Please contact me for more information. I can send you a list of homes in your search criteria that aren't in a flood zone and haven't flooded.
Keller Williams Realty
The one person with most to lose in this situation would be an insurance agent who would be covering the property. The company that insures the closest to water is State Farm. They will go up to 2500'.
Call a State Farm agent with an address and they should be able to tell you what the risk is. If you need a recommendation, contact me off line Gail@GailGladstone.com.