Elevation Certificates in St. Louis City, Missouri (2026)
St. Louis City is an independent city, separate from St. Louis County since 1876. It has its own Flood Insurance Rate Maps under FEMA's National Flood Insurance Program. When searching for flood zone information or pulling maps for a St. Louis City property, you must use the city's FIPS code (29510), not St. Louis County's code (29189). Using the wrong code will pull the wrong maps and produce incorrect flood zone data.
Three flood risk areas in the city drive most elevation certificate demand: the Mississippi River levee corridor along the eastern edge, the River des Peres in the southwest, and the Gravois Creek watershed.
What an Elevation Certificate Documents
An elevation certificate is a FEMA-standardized form completed by a licensed surveyor or engineer. It records the elevation of your building's lowest floor and compares it to the Base Flood Elevation on the current FEMA flood map for your location. If your building is above the BFE, your flood insurance premium is lower. If it is below, your premium is higher. The certificate makes that comparison official so your insurer, lender, or local floodplain administrator can apply it.
Flood Zone Areas in St. Louis City
Mississippi River Levee Corridor
The eastern edge of St. Louis City runs along the Mississippi River. Levees protect the waterfront and portions of the near-riverfront development, but levee-protected areas are still classified within the Special Flood Hazard Area under NFIP rules. Federally backed mortgages require flood insurance for properties in the SFHA, regardless of levee protection. Properties in Downtown St. Louis and the near-south riverfront area may be affected.
FEMA's accreditation standards for levees have changed in recent years. Some levees along the upper Mississippi were decertified or placed under study after updated hydrology data. Checking the current FEMA FIRM for your specific parcel at msc.fema.gov is the reliable way to confirm your flood zone status.
River des Peres
The River des Peres is a channelized waterway that enters the city from St. Louis County in the northwest and flows southeast through the city before discharging into the Mississippi near Carondelet. It has flooded repeatedly throughout its history, and FEMA maps show AE flood zone designations along significant portions of its corridor through southwest St. Louis City.
Neighborhoods most directly affected include Carondelet, Lindenwood Park, Ellendale, and parts of Affton-adjacent areas near the city-county border. Homeowners in these neighborhoods who carry or are acquiring flood insurance should have a current elevation certificate to establish their building's relationship to the BFE.
Gravois Creek
Gravois Creek flows through the southwestern corner of St. Louis City near the city-county line. FEMA maps show flood zone exposure along the creek corridor, affecting a smaller but meaningful number of residential properties in the far southwest of the city.
Why St. Louis City Flood Maps Are Separate from St. Louis County
Because St. Louis City is an independent jurisdiction with its own FIPS code, FEMA maintains separate Flood Insurance Rate Maps for the city and the county. A property on the city side of the boundary uses the 29510 flood maps. A property one block away in St. Louis County uses the 29189 maps. This distinction matters when searching msc.fema.gov, when filing a LOMA, or when a surveyor is completing an elevation certificate. Confirm which jurisdiction your property is in before pulling any flood map data.
Elevation Certificate Costs in St. Louis City
| Property Type | Typical Cost Range |
|---|---|
| Standard single-family residence | $300 to $500 |
| Larger or complex residential property | $450 to $650 |
| Commercial property | $700 to $2,000+ |
When You Need an Elevation Certificate in St. Louis City
- Your property is in a FEMA Special Flood Hazard Area, Zone AE or Zone A
- Your lender requires flood insurance as a mortgage condition
- You are applying for a building permit in a mapped floodplain area
- You want to file a Letter of Map Amendment (LOMA) to challenge your flood zone designation
- You are buying a property in the River des Peres corridor and want to verify insurance costs before closing
How to Find an Elevation Certificate Surveyor in St. Louis City
Elevation certificates in Missouri must be completed by a licensed Professional Land Surveyor. Verify the license at pr.mo.gov/apelsla.asp before hiring. Use the St. Louis City GIS Department resources at stlouis-mo.gov to confirm your parcel data before contacting a surveyor. Our land surveyor directory lists licensed Missouri PLS professionals serving St. Louis City who can complete your elevation certificate for the River des Peres corridor, the Mississippi River floodplain, or any other flood zone in the city.