Flood Zones, Floodplains and Elevation Certificates in Bastrop County, TX

The Colorado River runs straight through the middle of this county, and creeks feed it from every direction. That is a large part of what makes Bastrop beautiful, and it is also why flood zone is one of the first questions a careful buyer should ask here — before the inspection, ideally before the offer.

This page covers what the flood maps actually say, what Bastrop County requires if you want to build or remodel, what an Elevation Certificate is and whether you still need one, and what a seller is legally obliged to tell you. Everything below is sourced to FEMA, Bastrop County Development Services and the Texas Property Code, and the sources are named so you can check them yourself.

I am a REALTOR®, not a floodplain engineer, a surveyor or an insurance agent. I will never tell you a property “is fine” on flood. What I can do is make sure the right questions get asked, of the right people, while you are still inside your option period.

Start here: Bastrop County’s flood maps changed on May 9, 2023

This is the single most useful thing on this page. Bastrop County adopted new FEMA Flood Insurance Rate Maps effective May 9, 2023. The county wrote them into law the day before, in its Flood Damage Prevention Order, which states that the “Flood Insurance Rate Maps (FIRM) dated May 9, 2023 and any revisions thereto are hereby adopted by reference.”

The preliminary versions of those maps were published back on February 11, 2021 and went through a public review and appeal process before becoming effective. That means there was a two-year window in which the map on a county website, the map in an old appraisal, and the map a lender was using could all disagree.

The practical consequence: if you, a previous owner, or a listing agent checked the flood zone before May 2023, that check is out of date. Some parcels moved into a Special Flood Hazard Area in the 2023 remap. Some moved out. Neither the county nor FEMA sends a letter to every affected owner. Re-pull the map on the exact address, today.

How to look up a specific Bastrop County address

FEMA’s Flood Map Service Center at msc.fema.gov. Type the full street address. This is the official, current FIRM — the same map your lender will use.
Bastrop County’s floodplain GIS viewer, linked from the county’s Floodplain Management page. Useful for seeing a parcel in context with the creeks around it.
The Floodplain Administrator. Bastrop County’s is Marlene Flores, CFM, at (512) 581-7159. Development Services is at 211 Jackson Street in Bastrop, (512) 581-7176, open Monday to Friday 8am–4pm. Have the property ID from the appraisal district ready.
A licensed surveyor, if the parcel sits on or near a zone boundary. A map is drawn at a scale; your building pad is not. When it is close, only a survey settles it.

One caution worth repeating: online viewers are screening tools. Bastrop County’s own materials point you to the Floodplain Administrator for a determination, and for good reason. If the answer matters to your decision — and on a river property it usually does — get it from a person, in writing.

What the zone letters actually mean

Zone	What it means	What it means for you
A	High risk (Special Flood Hazard Area). 1% annual chance of flooding. No detailed engineering study, so no published Base Flood Elevation.	Federal mandatory-purchase rules generally apply when a building secures a federally backed or regulated loan. Building is harder because the elevation has to be established rather than simply looked up.
AE	High risk, 1% annual chance, with a published Base Flood Elevation.	Federal mandatory-purchase rules generally apply when a building secures a federally backed or regulated loan. The published elevation helps establish the required building height.
AO / AH	High-risk shallow flooding — sheet flow or ponding, typically one to three feet.	These are Special Flood Hazard Areas, so federal mandatory-purchase rules generally apply to covered loans.
Floodway	The channel and adjacent land reserved to carry the base flood without an unacceptable rise in water-surface elevation.	This is a highly restrictive designation. Development may require detailed engineering and county approval; check with the applicable floodplain authority before planning any work.
X (shaded)	Moderate risk — the 0.2% annual-chance area, often called the “500-year” floodplain.	Federal mandatory-purchase rules generally do not apply based on this zone alone, but a lender may still require coverage. Get a current quote rather than assuming the cost.
X (unshaded)	Minimal mapped risk.	Federal mandatory-purchase rules generally do not apply based on this zone alone, but flooding can still occur and a lender may impose its own requirement.

“100-year flood” is a probability, not a schedule. It means a 1% chance in any given year. Over a 30-year mortgage that compounds to roughly a 26% chance of at least one such flood — about one in four. Two of them can happen in consecutive years without anything being unusual. If a listing or a neighbor tells you an area “already had its hundred-year flood,” that is not how the arithmetic works.

What Bastrop County requires if you build, add on, or remodel

People are often surprised by this one: every development project in unincorporated Bastrop County needs a permit, whether or not the property is in a floodplain. The county runs three permit classes:

Class A — development outside the mapped 100-year floodplain.
Conditional Class A — the work is outside the floodplain, but the property itself contains floodplain.
Class B — development partly or wholly inside the mapped 100-year floodplain.

Three requirements in the county’s Flood Damage Prevention Order are worth knowing before you write an offer:

Two feet of freeboard. The lowest floor of new residential construction must be “elevated at least two feet (2’) above the Base Flood Elevation.” That is stricter than FEMA’s national minimum, and it affects both build cost and, later, your insurance rate.
The 50% rule. If the cost of an improvement — or the cost of repairing damage — “equals or exceeds 50% of the market value of the Structure” beforehand, it is a substantial improvement or substantial damage, and the whole building has to be brought into compliance with current floodplain rules. This is the rule that ambushes people buying an older river cabin to renovate. Price it in before you offer, not after.
Certified elevation documentation. Elevations must be documented on a FEMA Elevation Certificate, “certified by a registered professional engineer, surveyor, or architect,” and final certificates must include at least two photographs of the building.

If the property sits inside the city limits of Bastrop, Elgin or Smithville, the city is the floodplain authority, not the county. Ask which one applies before you call anyone.

Elevation Certificates: what they are, and what changed

An Elevation Certificate is a FEMA form that records how high a building’s lowest floor sits relative to the Base Flood Elevation, prepared and signed by a licensed surveyor, engineer or architect. For decades it was the document that set your flood insurance premium.

That is no longer true for purchasing NFIP coverage. FEMA moved the National Flood Insurance Program to Risk Rating 2.0 for new policies beginning October 1, 2021, and renewals beginning April 1, 2022. The methodology considers building-specific factors rather than applying one blanket rate to everyone in a zone. FEMA’s current Risk Rating 2.0 guidance says an Elevation Certificate is not required to purchase coverage, although submitting one may provide more refined elevation information and could lower the premium. An Elevation Certificate can still be required for local floodplain-development compliance.

So do you still want one? Often, yes — for two reasons that have nothing to do with buying the policy:

It can lower your rate. FEMA is explicit that an owner “may choose to provide an EC and submit it to their NFIP insurer to determine if it will affect their rate.” On a house that sits well above the flood elevation, that is money.
Bastrop County still requires one for construction and elevation compliance, insurance rules notwithstanding. If you intend to build, add on, or substantially improve, you will be getting one regardless.

Practical move: ask the seller whether an Elevation Certificate already exists. Many river-area properties have one from when they were built or last financed, and a copy costs you nothing. If there isn’t one and you want it, budget for a surveyor.

Flood insurance: who actually has to buy it

No Texas law requires a homeowner to carry flood insurance. The requirement comes from the lender. Under the federal mandatory purchase rule, flood insurance is required “upon receipt of federal financial assistance in the form of a loan or disaster assistance for a property located within a high-risk flood area” — that is, an SFHA. Lenders make that call using the current effective FEMA map, and they are free to require more than the federal minimum.

In an SFHA with a normal mortgage: you will be required to carry it. Price it during the option period, not after.
Outside an SFHA: it is optional. Get a quote anyway. Policies outside high-risk zones are usually modest, and roughly a third of NFIP claims historically come from outside mapped high-risk areas.
Premium increases for existing policyholders moving onto the new pricing are subject to an 18% annual cap set by Congress, so a large gap between the old rate and the true risk rate closes gradually rather than all at once.
Timing. An NFIP policy generally does not take effect for 30 days. The main exception is a policy bought in connection with a loan closing, which takes effect at closing. Confirm the effective date with your agent in writing — do not assume it is covered on day one.

If a property is in an SFHA, get the actual quote before your option period ends. A flood premium can move a monthly payment by enough to change which house you can afford, and it is far easier to discover that on day five than on day twenty-one.

What the seller has to tell you — and what they don’t

The Texas Seller’s Disclosure Notice under Property Code §5.008 has a dedicated flood section. It was significantly expanded by Senate Bill 339 in the 86th Legislature, effective September 1, 2019 — the most substantial change to the notice since it was created in 1993. A seller must state whether they are aware that the property is:

located wholly or partly in a 100-year floodplain (Zone A, V, A99, AE, AO, AH, VE or AR);
located wholly or partly in a 500-year floodplain — Zone X (shaded);
located wholly or partly in a floodway, a flood pool, or a reservoir;
subject to previous water penetration into a structure from a natural flood event, or previous flooding from the failure or breach of a reservoir;
covered by present flood insurance, and whether the seller has ever filed a flood claim or received FEMA or SBA assistance for flood damage.

Read the limits of that carefully. Every one of those answers turns on what the seller is aware of. An owner who bought after a flood, or who never looked up the zone, can answer “no” honestly and still be wrong. Several categories of seller — certain estate, trust and foreclosure transfers — are exempt from providing the notice at all. And if a seller genuinely did not know, the burden of proving otherwise falls on the buyer.

There is also a wider point that Texas learned expensively. In reporting on the 2019 law, the Texas Tribune noted that during Hurricane Harvey roughly 65,000 Houston structures outside designated floodplains flooded, against about 46,000 inside them. Being in Zone X is good news. It is not a guarantee.

Your option period flood checklist

Pull the FEMA map for the exact address, not the subdivision, at msc.fema.gov.
Ask the seller in writing for any existing Elevation Certificate, and for the flood section of the disclosure if it was not delivered with the contract.
Call the Floodplain Administrator with the property ID — (512) 581-7159 for unincorporated county, or the city if it is inside city limits.
Get a flood insurance quote even in Zone X, and get the effective date in writing.
If any part of the parcel touches a floodway, ask specifically what can and cannot be built there before you plan a shop, a barn, a pool or an addition.
If you intend to renovate, ask the county how the 50% substantial-improvement rule would apply to your plans at this property’s market value.
If you believe the property has been mapped into a flood zone incorrectly because it sits on naturally high ground, ask a surveyor about a Letter of Map Amendment. It is a real remedy and it is under-used.

Three things other real estate pages get wrong about this

“You need an Elevation Certificate to purchase NFIP flood insurance.” Risk Rating 2.0 does not require one to purchase coverage, although an Elevation Certificate may help refine the premium and may still be required for local floodplain-development compliance.
“Zone X means it can’t flood.” Zone X means it is outside the mapped 1% annual chance area. Harvey put more Houston structures under water outside the floodplain than inside it.
“Just check the flood map.” In Bastrop County the honest version is “check the map that took effect May 9, 2023.” Anything pulled before that is the previous map, and for some parcels the answer changed.

The honest summary

Flood risk in Bastrop County is real, well documented, and entirely knowable before you close. The buyers who get hurt are the ones who relied on an old map, assumed Zone X meant zero, or bought a river cabin to renovate without understanding the 50% rule. None of those are hard to avoid — they just have to be checked early, while you still have the right to walk.

Pull the current map. Ask for the Elevation Certificate. Call the floodplain office. Get the quote. That is the whole checklist.

Book a Consultation

Call or Text (512) 993-8488

Primary sources: FEMA Flood Map Service Center and NFIP Risk Rating 2.0 guidance; Bastrop County Floodplain Management and its Flood Damage Prevention Order; and Texas Property Code §5.008. This page provides general information from a REALTOR®, not legal, engineering, lending, or insurance advice. Flood maps, regulations, and underwriting requirements change; verify anything affecting your decision with the applicable floodplain authority, lender, licensed surveyor, and licensed insurance agent.

Written by Bre Meador, REALTOR® — All City Real Estate, Bastrop County, TX · U.S. Army veteran and former nurse · TREC #0835116
Read client reviews. Last updated August 5, 2026. This page is general information from a licensed REALTOR®, not tax, legal, engineering or insurance advice.