Flood Rules
Smith County has a flood damage prevention rule for unincorporated land
Before you build in a low-lying area of Smith County, check whether your land is in a FEMA flood zone — county rules restrict development in those areas.
Smith County has an official Flood Damage Prevention Regulation. It is part of the county's codified policies. If you want to build in or near a floodplain in an unincorporated area, you must go through a special review first. The rule helps keep flood insurance rates lower and protects property from flood damage.
You can look up any address at the FEMA Flood Map Service Center to see if it is in a high-risk flood zone. In East Texas, the Neches River and its smaller tributary streams can flood. Properties near those waterways deserve a close look before you buy or build.
Source to confirm: Smith County — County Ordinances and Policies