Blog · October 14, 2026 · Missouri
Brentwood Flood Zone Map: checking a property's flood zone
The zone on FEMA's map affects insurance, building and resale near Webster Groves.
Main page: St. Louis County, MO GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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Weighing a property around Maplewood? A quick look at the Brentwood flood zone map shows whether it sits in a FEMA flood zone, and no account is needed. Covered here for Brentwood: locating a parcel on FEMA's map, decoding A, AE and X, and matching it with the county parcel viewer.
Checking the Brentwood flood zone map step by step
Flood zones come from FEMA's Flood Map Service Center: type an address near Rock Hill, then open the map view for that panel. Vacant ground around Maplewood can still be found: pan from the closest town then click the parcel area.
Opening the official parcel viewer
Your first stop is the St. Louis County ArcGIS parcel map; it covers every assessed parcel from Webster Groves to Ladue. Closer to Maplewood, enter a street address, an owner's name or a parcel number, and the matching parcel lights up. In and around Ladue, the parcel card normally shows the owner of record, assessed acreage, a parcel ID and often a sale date.
Where Brentwood fits in
Brentwood sits in St. Louis County, Missouri, which means parcel data comes from the county. In and around Clayton, the municipality handles matters such as zoning, permits and utilities inside its limits, and the county still keeps the parcel and deed records. Acreage past the city limits near Ladue usually answers to county rules instead.
Next door to St. Louis County
For a parcel near Richmond Heights, st. Louis County meets Madison County, IL, Monroe County, IL, St. Clair County, IL, Franklin County, and Jefferson County, and each of those keeps its own parcel map. A tract near the line by Webster Groves can be split across two assessors' files, so check the adjacent map as well. In and around Maplewood, the Platbookmapper state page lists each bordering county map for Missouri.
What the zone letters mean
For a home near Webster Groves, zones beginning with A or V mark the Special Flood Hazard Area, meaning a 1% or greater chance of flooding each year. For a parcel near Clayton, a shaded X area is moderate risk, between the 1% and 0.2% annual chance floods; plain X, or C on older maps, means minimal mapped risk.
Matching the zone to the lot lines
FEMA's map shows zones but not ownership, so pair it with the St. Louis County ArcGIS parcel map for the outline of the tract near Rock Hill.
Reading the legal description
Missouri uses the Public Land Survey System, so deeds around Ladue reference sections and townships. A standard section is about one square mile, roughly 640 acres, with 36 sections to a township, though sections near Ladue can be irregular. Copy the legal description from the record for the parcel near Webster Groves before you request a deed or survey.
Money questions tied to the zone
On ground around Maplewood, get the Elevation Certificate if one exists: it compares the building to the BFE. New construction in a floodplain near Maplewood usually means extra permit review; call the permitting office early.
Before you lean on the lines
Acreage on the record is an estimate; only a licensed surveyor establishes the real corners for a parcel near Maplewood. On ground around Richmond Heights, records update in batches, so a deed recorded last month can take weeks to appear.
Water near Webster Groves
Small streams around Ladue may not have detailed mapping, so look for water marks and debris lines. Wet ground around Rock Hill is a separate issue from flood zones; check the National Wetlands Inventory mapper for a first look.
Getting answers from the right desk
If the acreage or value on a parcel near Clayton looks off go to the County Assessor, which maintains the tax roll. Zoning, permits and septic questions near Webster Groves go to planning, building or health offices, and the answer depends on jurisdiction.
On site with the map
The parcel map usually runs in a mobile browser, which helps when you're standing on land near Webster Groves, but coverage can be spotty out of town. A screenshot of the parcel near Rock Hill with its ID keeps working without signal.
A short flood checklist
Ask the listing agent for any Elevation Certificate for the house near Rock Hill; getting a quote early keeps the budget honest.
Frequently asked
Do I need to worry about flooding in Zone X near Webster Groves?
For most people, X zones around Richmond Heights are lower risk, not no risk, and floods still happen outside high-risk zones.
Where do I find the BFE for a lot near Webster Groves?
Short answer: a BFE near Maplewood tells builders how high the lowest floor should be, and an Elevation Certificate compares the building to it.
What is a LOMA for land near Richmond Heights?
Usually, FEMA's LOMA process is the usual route when a building near Ladue sits above the base flood elevation; it starts with an elevation survey.
Is AE a high-risk flood zone in Brentwood?
Short answer: both are high-risk zones, but only AE has a base flood elevation, so builders near Ladue design to that elevation.
Why do offices ask for the parcel ID for land near Richmond Heights?
Every office uses it to pull the same file for land near Richmond Heights; copy it before you call anyone.
Open the official St. Louis County, MO parcel map See it in the Platbookmapper directory
Not a survey. County GIS and tax parcel maps are assessment and planning layers. They are not a substitute for a recorded plat, deed, or licensed survey, especially for fences, setbacks, or boundary disputes.