Selling in a San Antonio Flood Zone: FEMA Maps, Elevation Certificates, and the NFIP Policy Handoff

If your home is in a FEMA Special Flood Hazard Area (SFHA) — Zone A, AE, or AO on the current Flood Insurance Rate Map — you have to disclose it, the buyer's lender is going to require flood insurance, and the premium is now the single biggest variable in whether your deal closes. Get ahead of it. Pull the flood determination, order the elevation certificate if you don't have one, and price the NFIP policy assumption into your marketing before a buyer's insurance quote blows up the contract on day 12 of the option period.

This is a Bexar County-specific problem more often than sellers realize. Salado Creek, Leon Creek, Olmos Creek, the Medina River, Cibolo Creek, and dozens of tributaries push SFHA boundaries into established neighborhoods on the North East, West, and far South sides. A home two blocks off the creek can be in Zone X. A home on the same street, downhill, can be in AE with a base flood elevation eight feet above the finished floor. The map decides. Not the address.

How to find out what zone you are actually in

Do not trust a broker's marketing card or a Zillow-style overlay. Pull it from the source.

• FEMA Map Service Center (msc.fema.gov) — enter the address, generate the FIRMette. This is the document a lender's flood determination vendor will pull.
• Bexar County Flood Control / SARA viewer — the San Antonio River Authority publishes a public floodplain viewer that overlays effective FEMA maps with local drainage studies. Useful for creeks SARA has re-studied more recently than FEMA has adopted.
• City of San Antonio Development Services — for properties inside city limits, DSD staff will confirm the zone and tell you whether the parcel is in a regulatory floodway (worse than SFHA — building is restricted).

Zones you will actually see in Bexar County:

• Zone X (unshaded) — outside the 500-year floodplain. No federal insurance requirement.
• Zone X (shaded) — inside the 500-year, outside the 100-year. No mandatory insurance, but lenders occasionally ask.
• Zone AE — 100-year floodplain with a published Base Flood Elevation (BFE). Federally backed mortgages require flood insurance.
• Zone A — 100-year floodplain, no BFE published. Insurance required, and pricing is worse because the elevation is unknown.
• Floodway — the channel itself. If any structure sits in the floodway, expect major lender and buyer resistance.

What Texas Property Code § 5.008 makes you disclose

The 2019 legislature (SB 30) rewrote the flood section of the Seller's Disclosure Notice. The current TREC OP-H and the TAR equivalent both include a full flood block. You must answer, in writing:

• Whether the property is located wholly or partly in a 100-year or 500-year floodplain.
• Whether the property is in a floodway.
• Whether you have ever filed a flood insurance claim.
• Whether you have received FEMA or SBA disaster assistance for flood damage.
• Whether you currently carry flood insurance.
• Whether there is a prior flood event affecting the property, including flooding from a reservoir release, hurricane, or from water flowing onto the property from off-site.

"I don't know" is a legitimate answer for map questions when you truly do not know — but if the buyer's lender orders a flood determination and it comes back AE, and you checked "no" on the disclosure, you have a problem. Pull the FIRMette yourself before you sign OP-H. Sellers who misrepresent flood status get sued under DTPA and § 5.008(d), and the statute expressly allows the buyer to terminate if the notice is not delivered on or before the contract's effective date.

The elevation certificate: when you need one, when you skip it

An Elevation Certificate (EC) is a FEMA form (086-0-33) prepared by a licensed Texas surveyor or engineer. It states the finished floor elevation, the lowest adjacent grade, and the BFE, and it is the single document that decides whether the buyer's NFIP premium is $700 a year or $4,500 a year under Risk Rating 2.0.

When to order one before you list:

• The home is in Zone AE and you already suspect the finished floor is above BFE (common for homes built after the 1980s under the city's floodplain ordinance).
• The home was elevated, retrofit, or built on pier-and-beam and you believe it will price out favorably.
• You had one done previously and it is more than a few years old — reissue is cheaper than a new survey.

When to skip it:

• The home is in Zone X. No EC needed.
• The home is clearly below BFE and the certificate will just document bad news. In that case, disclose the flood history, expect the buyer to insure, and price accordingly.

A new EC in San Antonio runs roughly $500–$900 depending on the surveyor and site complexity. If it saves the buyer $3,000 a year in premium, it saves your deal.

The NFIP policy assumption — the move most sellers miss

NFIP policies are assumable. If you bought the house before FEMA re-mapped or before Risk Rating 2.0 fully phased in, your premium may be significantly below what a new policy would cost the buyer today. That grandfathered rate transfers with the property if you assign the policy at closing.

How it works:

1. Call your flood insurance carrier (Wright Flood, Neptune, or whoever writes the NFIP-backed policy) and request the policy assumption paperwork.
2. At closing, the title company includes an assignment. The buyer pays the pro-rated remaining premium.
3. The buyer keeps your effective date, your rating, and any glidepath discount.

This is a real dollar difference. On homes near Salado Creek in 78217 or 78218, or older stock in Olmos Park and the Olmos Basin, I have seen assumed policies come in under $1,200 while a new-issue policy on the same house prices at $3,800–$5,200. Marketing the assumable policy in MLS remarks and in the buyer's agent conversation is worth doing.

Pricing and marketing a flood-zone home

Buyers will find out. Every lender-ordered flood determination catches SFHA properties. Your job is to control the narrative:

• Put the FEMA zone, the effective map date, and the finished floor elevation in your listing file (not necessarily the public remarks, but ready for the buyer's agent).
• If you have never had water in the house, say so — and back it up with the § 5.008 disclosure and any elevation data.
• If flooding has occurred, disclose the event, the remediation, and any drainage improvements (regraded lot, French drain, sump, elevated HVAC pad). SARA has completed channel improvements on portions of Salado and Leon Creek — if your property benefits, name the project.
• Do not price at neighborhood average and hope. Comparable sales in the same flood zone are the only honest comps. A Zone AE house on Nacogdoches Road does not comp to a Zone X house three blocks north on the same road.

What most sellers get wrong

• Assuming the zone hasn't changed. FEMA re-issued Bexar County maps in the last decade and SARA re-studies specific creek reaches regularly. The zone your title policy showed in 2011 is not necessarily today's zone. Pull a current FIRMette.
• Checking "no" on the § 5.008 flood questions because water never came inside. The statute asks about the property, not just the structure. A yard that floods, a driveway that becomes impassable, water flowing from off-site — all of that is reportable.
• Letting the buyer's insurance quote come in cold on day 10. If you know the home is in AE, get an elevation certificate and a policy assumption quote before you list. Handing the buyer's agent a $1,100 assumable NFIP policy on day one prevents the panicked termination on day 9.
• Confusing the floodway with the floodplain. A property in the regulatory floodway has building and rebuilding restrictions that survive the sale. That is a material fact and it affects lender appetite. Confirm with City DSD if your FIRMette is ambiguous.
• Ignoring a prior FEMA claim. The NFIP tracks claims by property. A Repetitive Loss or Severe Repetitive Loss designation follows the address, not the owner. The buyer's insurer will see it. Disclose it first.
• Treating Zone X shaded like it's the same as unshaded. It is not. It sits in the 0.2% annual chance floodplain, and some lenders — particularly on portfolio and jumbo products — will require flood insurance anyway. Set the expectation upfront.

Before you list

Order the FIRMette, order the elevation certificate if the zone warrants it, call your flood carrier about assumption paperwork, and write § 5.008 answers that would survive a deposition. Do that in the week before the sign goes up, not on day 12 of the option period.

When you are ready to move, list your home on HomeFinder at /list-your-home, or if you would rather work with an agent who has closed flood-zone deals in Bexar County, find one at /agents. More seller guides on disclosure, pricing, and closing are collected at /resources.