The City of Canandaigua maintains and interprets the Flood Insurance Rate Map (FIRM) (PDF) prepared by FEMA. A property that is located within the 100-year Flood Plain (or Special Flood Hazard Area (SFHA)) may be required by the mortgage holder to carry additional flood insurance.
The attached map is for illustrative purposes only. An official written interpretation can be issued upon request of the Zoning Officer 585-337-2180 or through email.
It may be that potions of your property are within the Special Flood Hazard Area, while your home itself is not. Further, the FIRM maps were developed at a large scale and may not accurately describe the details of your specific property. If you believe the FIRM map is inaccurate in how it identifies your property, you may seek a "Letter of Map Amendment" (LOMA). You would be responsible for hiring a land surveyor to establish the actual elevation at the foundation wall of your dwelling (i.e., Elevation Certificate). This information is then sent to FEMA with the request that the structure be removed from the Special Flood Hazard Area.
More information can be found at the FEMA Letter of Map Amendment page.