Floodplain Management


Public WorksSurveying Services

Napa Mustard

Floodplain Management

The Floodplain Management section of the Engineering Services Division reviews all types of construction and land development applications for compliance with the requirements of the National Flood Insurance Program, implemented locally in Chapter 16.04 of the Napa County Code.


Elevation Certificate

Floodplain Management Permit



Floodplain Management Permits Brochure


National Flood Insurance Program: Main Page
National Flood Insurance Program: Information
National Flood Insurance Program: Flood Insurance
National Flood Insurance Program: Map Service Center
National Flood Insurance Program: Flood Hazard Mapping

The National Flood Insurance Program, administered by the Federal Emergency Management Agency, establishes requirements nationwide for the prevention and/or minimization of damage due to flooding. Standard requirements apply for elevating new structures above the level of the Base Flood (also known as the “100-Year Flood”), which is the storm event that has a 1% chance of occurring at any time. Other requirements affect the design of non-residential structures, which do not need to be elevated in the same manner under certain circumstances, provided that construction techniques are incorporated which will allow the passage of flood flows unimpeded, so as not to increase damage to neighboring properties.