Blog · October 14, 2026 · Texas
San Antonio Flood Zone Map, Texas: a practical guide
The zone on FEMA's map affects insurance, building and resale near Castroville.
Main page: Medina County, TX GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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Weighing a property around Devine? A quick look at the San Antonio flood zone map shows whether it sits in a FEMA flood zone, and no account is needed. This San Antonio guide covers: the free FEMA tools, what each zone label means, lender insurance rules and what a LOMA is.
The San Antonio flood zone map: start here
Flood zones come from FEMA's Flood Map Service Center: type an address near Castroville, then open the map view for that panel. Rural land near Natalia with no street number can still be found: pan from the closest town and click inside the land.
Where the parcel data lives
Your first stop is the appraisal district interactive map; it covers every assessed parcel around Lytle and Castroville. If you're looking near Natalia, put in a street address, an owner's name or a parcel number, and the viewer zooms to the match. For a home near Natalia, a pop-up or side panel normally shows the owner of record, assessed acreage, a parcel ID and sometimes recent sales.
Medina County in a few facts
Hondo serves as the county seat, where most land records are kept. Smaller places on the map include Castroville, Devine, and LaCoste. About 54,797 people live in Medina County (Census Bureau estimate, 2023) on roughly 1,325 square miles. Medina County was formed in 1848, and some chains of title near Castroville are long.
San Antonio, TX: the basics
San Antonio is part of Medina County, Texas, which means parcel data comes from the county. Out toward Natalia, city or town hall handles things like zoning, permits and utilities within town limits, while the county keeps the tax map. Acreage past the town limits toward Castroville generally answers to county rules instead.
What the zone letters mean
An AE label includes a base flood elevation (BFE), while plain Zone A does not; that elevation drives building rules near Devine. Closer to Castroville, a low-risk label isn't a guarantee: FEMA notes that floods happen outside mapped zones too.
Matching the zone to the lot lines
FEMA's map shows zones but not ownership, so open the appraisal district interactive map next to see exactly which lot near Lytle you're looking at.
Neighboring parcel maps
Medina County touches Atascosa County, Bandera County, Bexar County, Frio County, and Uvalde County; every one of them runs a separate parcel map. Acreage along the edge near Natalia can be split in two county records, so check the adjacent map as well. For property near Devine, our state page lists each bordering county map for Texas.
Money questions tied to the zone
For property near Castroville, an Elevation Certificate from a surveyor helps: it compares the building to the BFE. New construction in a floodplain near Natalia can trigger elevation rules; check with the county or town building office before you plan.
Which office to call
For assessment questions about property around LaCoste are handled by the appraisal district, which maintains the tax roll. Questions about what you can build around Lytle go to planning, building or health offices, and the answer depends on jurisdiction.
A short flood checklist
Ask the seller about past flood claims for the house near Natalia; getting a quote early keeps the budget honest.
Legal descriptions in Texas
Rural deeds near Natalia are often described by metes and bounds, a series of courses and distances from a starting point. Town lots near LaCoste refer to a recorded plat, making them easier to find. Write down the legal description for the tract near LaCoste when you talk to a surveyor.
Water near Devine
Small streams around Natalia may not have detailed mapping, so ask neighbors about past flooding. Marshy spots near Hondo can limit building too; check the National Wetlands Inventory mapper for a first look.
Deeds, plats and who keeps them
For anything that matters, request the recorded deed through the County Clerk; the parcel map near Hondo only summarizes it. For a tract near Castroville, have ready the book and page from the tax record so staff can find the deed fast.
On site with the map
Most viewers work in a phone browser, useful out on a road near Lytle, but coverage can be spotty out of town. A saved image of the lot near Hondo and its lines helps when you meet an owner or agent.
Quick answers
When is flood insurance required near Devine?
In most cases, lenders generally require it for buildings near Lytle in a Special Flood Hazard Area when the loan is federally regulated or insured; outside those zones it's your call.
Do I need to worry about flooding in Zone X around Hondo?
Good question; shaded X is moderate risk and unshaded X is minimal risk; many owners near LaCoste buy coverage anyway.
What is a base flood elevation for land near LaCoste?
It depends, but a BFE near Natalia tells builders how high the lowest floor should be; surveyors near Lytle use it often.
Is AE a high-risk flood zone for land near Hondo?
An AE zone has a 1% annual chance of flooding and a base flood elevation, which shapes building rules near Lytle.
How is land described in Texas deeds near Hondo?
On ground around Lytle, deeds use lot and block, metes and bounds or survey descriptions; copy it for any survey or title request.
Open the official Medina County, TX 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.