Blog · October 14, 2026 · Texas
Donna Flood Zone Map: checking a property's flood zone
Flood zones are set by FEMA, and checking one near Weslaco takes a few minutes.
Main page: Hidalgo County, TX GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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Weighing a property around Alamo? The Donna flood zone map tells you whether the lot falls inside a mapped floodplain, and no account is needed. What this Donna guide covers: the free FEMA tools, what each zone label means, lender insurance rules and how to challenge a map that looks wrong.
Checking the Donna flood zone map step by step
Flood zones come from FEMA's Flood Map Service Center: search an address around Mercedes, and pick the FIRMette or map view. A tract near Weslaco without an address can still be found: zoom in from US Route 281 and click inside the land.
Pulling up a parcel
Begin with the appraisal district map; it includes each assessed parcel around Mercedes and Progreso Lakes. On ground around Weslaco, enter a street address, an owner's name or a parcel number, then pick the result to center the map on it. For land near Progreso, the record panel typically gives the owner of record, acreage on the tax roll, a parcel ID and often a sale date.
Donna, TX: the basics
Donna sits in Hidalgo County, Texas, and the county assessor maps its lots. For property near Weslaco, the municipality handles things like zoning, permits and utilities within town limits, and the county still keeps the parcel and deed records. Acreage past the city limits out by Progreso often follows county rules, not municipal ones.
Before you lean on the lines
The acreage figure is an estimate; only a licensed surveyor sets the real corners for a parcel near Mercedes. On ground around Mercedes, owner names and values update on a schedule, so a deed recorded last month might lag behind.
When a parcel crosses a boundary
Hidalgo County meets Brooks County, Cameron County, Kenedy County, Starr County, and Willacy County, all with their own assessor records. Acreage along the edge near Mercedes can show up across two assessors' files, so look at the neighboring map as well. For acreage around Mercedes, our state page lists each neighboring county map across Texas.
Hidalgo County in a few facts
Edinburg is the county seat, home to the main records offices. You'll also find Weslaco, Alamo, Progreso, and San Juan, each with its own cluster of lots. Roughly 898,471 people call Hidalgo County home (Census estimate, 2023) across about 1,571 square miles. Hidalgo County dates to 1852, and some chains of title near Progreso are long. Features like Lower Rio Grande Valley National Wildlife Refuge help you orient on the aerial around Progreso Lakes.
Water near Progreso Lakes
Low-lying fields near Progreso Lakes aren't always studied in detail, so walk the land after rain. Marshy spots near Mercedes can limit building too; check the National Wetlands Inventory mapper for a first look.
What the zone letters mean
Zone AE comes with a base flood elevation, while plain Zone A does not; surveyors near Mercedes use that number. If the land is near Alamo, a shaded X area marks moderate flood hazard, roughly the 100- to 500-year range; plain X, or C on older maps, is minimal risk.
Parcel lines plus flood zones
FEMA doesn't draw property lines, so check the appraisal district map too to confirm you have the right parcel near Alamo.
Recorded documents worth pulling
The map is an index, not the title: deeds, subdivision plats and easements covering ground around Mercedes are filed with the County Clerk. Long-held tracts around Alamo can go back through many deeds, and a title company can sort it out before a purchase.
Getting answers from the right desk
If the acreage or value on a parcel near Progreso looks off belong with the appraisal district, the office behind the parcel record. Building or septic questions for a lot near Mercedes are for the local planning and health departments, and the answer depends on jurisdiction.
What to request from a seller
Ask the listing agent for any Elevation Certificate on the property near Weslaco; an insurance quote early avoids surprises.
Lenders and permits
In and around Mercedes, ask for an Elevation Certificate: it compares the building to the BFE. Remodeling a house in a zone near Mercedes often needs a floodplain permit; ask the local floodplain administrator before you plan.
Quick answers
Do I need to worry about flooding in Zone X in Donna?
It depends, but X zones around Weslaco are lower risk, not no risk; FEMA notes that a large share of claims come from these areas.
What is a base flood elevation near San Juan?
Good question; a BFE near Weslaco tells builders how high the lowest floor should be; surveyors use it often.
When is flood insurance required around Progreso?
In most cases, lenders generally require it for buildings near Mercedes in a Special Flood Hazard Area when the loan is federally regulated or insured; elsewhere it's optional.
Is my property near Progreso in a flood zone?
Generally, look up the spot near Weslaco in FEMA's National Flood Hazard Layer viewer; then confirm the parcel on the county viewer.
Which office handles records for land near Mercedes?
For land near Progreso Lakes, assessment goes to the appraisal district and deeds to the County Clerk, while zoning questions go to planning
Open the official Hidalgo 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.