Blog · October 14, 2026 · Texas
Cameron County Flood Zone Map, Texas
Look up any Cameron County address on FEMA's flood map, read the zone, and match it to the parcel record for land around La Feria.
Main page: Cameron County, TX GIS & Parcel Viewer (official map link, Cameron County facts and neighboring maps).
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A Cameron County flood zone map check belongs in the due diligence for any Cameron County property, from a house lot in Brownsville to farm ground near Palm Valley. For any tract in Cameron County, Texas, the answer affects insurance, permits and resale.
The sections below go from the FEMA search to the Cameron County parcel record, then cover insurance, permits and map changes near Palm Valley.
How to use the Cameron County flood zone map
FEMA's official flood maps for Cameron County are free at the FEMA Flood Map Service Center. If a tract near Port Isabel has no street number yet, search the nearest road and pan to it. For an irregular lot near Port Isabel, try FEMA's National Flood Hazard Layer viewer; zoom to the tract near Port Isabel and click. Switch to the appraisal district map and locate the same tract near Port Isabel. Laying the county parcel outline beside the FEMA shading lists if a homesite near Port Isabel sits above or inside the zone.
Search Cameron County parcels by owner, address or ID
For land around Brownsville, open the appraisal district map (the ProdigyCAD maps portal); it is the map Cameron County itself publishes. Rural accounts near Brownsville list an abstract in the legal description; copy it with the county property ID. For a backup route to the map covering Brownsville, our Cameron County directory entry keeps the link current.
What the flood zone letters mean
Any Cameron County parcel shaded as Zone A, AE, AH or AO sits in what FEMA calls a Special Flood Hazard Area, land with a 1-percent chance of flooding in any given year (the base or 100-year flood). Zone AE near Port Isabel means FEMA published a base flood elevation; plain Zone A means no detailed elevation was studied. Land near Port Isabel in shaded X (Zone B on older maps) falls between the base flood and the 500-year flood. Unshaded Zone X near Port Isabel is minimal risk.
Low ground and small streams around Palm Valley
Small streams and ditches near Palm Valley may not be studied in detail, which is why it is worth walking the ground after a heavy rain.
Questions to ask before buying in Cameron County
Request any past flood claims history for a Cameron County property before closing; it tells you more than the map alone. An agent working in Cameron County can quote flood coverage once you know the zone for the lot near Port Isabel.
Map dates and floodways in Cameron County
When FEMA restudies streams in the county, preliminary maps are posted before they take effect, and a lot near Cameron Park can move in or out of a zone. Floodways, shown as hatched areas on some panels, are the channel and nearby land that must stay open, and building there near Los Fresnos faces the strictest rules.
Insurance, permits and map changes
Insurance is the practical stake for a Cameron County buyer. If a barn or house outside Palm Valley falls inside an A or V zone and carries a federally backed mortgage, federal rules call for flood insurance, provided the community near Palm Valley takes part in the National Flood Insurance Program. Outside the A zones around Port Isabel, insurance is a choice, not a mandate; pricing a policy for land near Port Isabel is still worth a call. Where a structure near Palm Valley looks higher than the shading suggests, the titleholder can ask FEMA for a Letter of Map Amendment (LOMA), most often backed by an elevation certificate from a surveyor who works in the county. Adding on to a house near Port Isabel inside the zone most often needs a floodplain permit; the county floodplain administrator can say what applies.
Cameron County flood zones questions
Where do I get an elevation certificate in Cameron County?
A professional surveyor or engineer prepares it, and the building office serving Port Isabel may already have one on file for newer construction.
Can a flood zone in Cameron County be changed?
FEMA reviews requests such as a LOMA for Cameron County properties; start with an elevation certificate.
Does a 100-year floodplain near Brownsville flood only once a century?
No; land near Brownsville in the 100-year floodplain faces a 1-percent annual chance, not a once-a-century schedule.
Can I build in a flood zone in Cameron County?
Often, but local floodplain rules apply; ask the county or town building office in Port Isabel well before you buy.
Is flood insurance required for a Zone X lot in Port Isabel?
Not under federal rules; Zone X in Cameron County is outside the Special Flood Hazard Area, although a lender can still require coverage.
What does Zone AE mean on a Cameron County flood map?
Zone AE on a lot in Port Isabel is a mapped 100-year floodplain with a base flood elevation, so mandatory insurance rules apply to federally backed mortgages.
Open the official Cameron County, TX parcel map Cameron County 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.