Flood Risk for San Antonio Renters: What Your Landlord Must Disclose and What Your Insurance Won't Cover

San Antonio sits on flat limestone cut by a dozen creeks that go from dry to deadly in under an hour. The Memorial Day floods of 2013 and 2015, the October 1998 event, and the October 2018 Olmos Basin inundation weren't freak accidents — they were the predictable behavior of Salado Creek, Leon Creek, Olmos Creek, and the San Antonio River when a slow-moving storm sits over the Edwards Plateau. If you're renting here, three different systems protect you: a landlord disclosure required by state law, a FEMA flood map you can check yourself, and an insurance policy you almost certainly need to buy separately. Most renters only use one of them, and sometimes none.

The flood disclosure your landlord owes you in writing

Texas Property Code § 92.0135, which took effect January 1, 2022, requires a landlord to give any prospective tenant a written notice before signing a lease if either of the following is true:

• The dwelling is located in a 100-year floodplain (FEMA Special Flood Hazard Area, Zone A or V).
• The dwelling has flooded at least once in the five years before the lease is signed.

The disclosure must be a separate written notice — not buried in the lease. If the landlord knowingly fails to disclose and the unit later floods, the tenant can terminate the lease and recover actual damages. This is a real remedy, but only if you kept the paperwork and can show the landlord knew.

Two things trip renters up here. First, "100-year floodplain" means a 1% annual chance of flooding — a property can flood twice in five years and still be in that zone. Second, the law only requires disclosure of the FEMA 1% zone. The 500-year floodplain (Zone X, shaded) is not required to be disclosed, and plenty of San Antonio homes that flooded in 2013 and 2015 were in that zone or just outside any mapped zone at all.

Ask for the § 92.0135 disclosure in writing before you pay an application fee. If the landlord says the property isn't in a floodplain, get that in an email so there's a paper trail.

San Antonio's actual flood corridors

FEMA maps are the legal standard, but a renter benefits from knowing where the water actually goes. The high-risk corridors in Bexar County:

• Salado Creek — runs north-to-south through the east and northeast side, crossing Thousand Oaks, Windcrest, Northeast ISD attendance zones, and dumping into the San Antonio River near Southeast Military. Houses backing to Salado Creek Greenway flood repeatedly.
• Leon Creek — the west-side counterpart, running from Camp Bullis down through Northside ISD neighborhoods, Leon Valley (not Leon Creek, different city), Loop 410 crossings, and out to the south.
• Olmos Creek and Olmos Basin — Olmos Dam protects downtown, but neighborhoods upstream in Castle Hills, Olmos Park, and parts of Alamo Heights (78209) sit in the basin itself.
• Cibolo Creek — the north-east border corridor through Schertz, Cibolo, and Selma. New construction in Cibolo (78108) often sits close to tributaries that aren't on older maps.
• San Pedro Creek and Alazan-Apache Creek — west-side urban creeks that have been partially channelized but still back up into older neighborhoods in 78207.
• Martinez Creek and Rosillo Creek — south-east drainage affecting parts of East Central ISD and Southside ISD zones.

New Braunfels renters (308 active listings in RentInSA's inventory as of October 2026) should add the Guadalupe and Comal rivers to the list. Boerne renters should check Cibolo Creek's upper reach, which runs right through town.

How to check the FEMA map in five minutes

FEMA's Map Service Center at msc.fema.gov lets you type any San Antonio address and pull the current Flood Insurance Rate Map (FIRM). What you want to see:

• Zone X (unshaded) — minimal risk per FEMA.
• Zone X (shaded) — 500-year floodplain, 0.2% annual chance. Not required to be disclosed under § 92.0135, but worth knowing.
• Zone A, AE, AO — Special Flood Hazard Area, 1% annual chance. Triggers landlord disclosure. Lenders require flood insurance on mortgaged properties here, which means your landlord's insurer is already treating this as flood-prone.
• Zone AE with floodway — the active channel. If any part of the structure is in the floodway, assume it will flood.

Bexar County's own Flood Control page and the SARA (San Antonio River Authority) viewer sometimes show more granular local data than FEMA, including the 100-year and 500-year lines plus recent flood events. Cross-check both.

Renters insurance does not cover flood

This is the single most expensive misunderstanding in San Antonio rentals. A standard renters insurance policy — the HO-4 form most landlords require in the lease — covers fire, theft, wind, and most water damage from inside the dwelling (burst pipes, overflowing tubs). It explicitly excludes flood, defined as surface water, rising water, and water that enters from outside the structure.

If Salado Creek jumps its banks and three feet of water comes through your front door, your renters policy pays nothing for your furniture, electronics, or clothing. Your landlord's property insurance covers the building, not your stuff.

To cover contents against flood, you need a separate National Flood Insurance Program (NFIP) policy, sold through regular agents and administered by FEMA. For renters, an NFIP contents-only policy runs a few hundred dollars a year in a low-risk zone and more inside Zone A. Private flood insurance is also available and sometimes cheaper. There is a standard 30-day waiting period from policy purchase to coverage start — you cannot buy it the week a hurricane enters the Gulf.

What to inspect before you sign

Walk the property with flood risk in mind:

• Look for a visible waterline on garage walls, interior drywall seams, or baseboards — a horizontal stain two feet off the floor is what you're looking for.
• Check whether baseboards or lower drywall look newer than the rest of the room. Fresh paint on just the bottom four feet is a tell.
• Ask the landlord directly: "Has this property flooded in the last five years? Can you provide the § 92.0135 disclosure?" Get the answer in writing.
• Note how far the structure sits below street level. In Olmos Basin and parts of Alamo Heights, driveways slope down into the garage — that garage is the first thing to fill.
• Walk the backyard. If it backs to a greenway, drainage ditch, or creek, pull up the FEMA map on your phone before you leave.

What most people get wrong

• Assuming new construction can't flood. Cibolo (median rent $2,080/mo in RentInSA's October 2026 data) and parts of far-north San Antonio have subdivisions built in the last five years on filled lots next to tributaries that aren't on the pre-development FEMA map. New doesn't mean dry.
• Trusting "not in a floodplain" without a map printout. Landlords sometimes mean "not in the floodway" or "not where I think the floodplain is." Pull the FIRM yourself.
• Thinking the landlord's insurance covers tenant belongings. It never does, flood or otherwise. That's what the HO-4 is for, and even the HO-4 excludes flood.
• Buying renters insurance the day you move in and assuming you're covered against flood. You're not covered against flood at all, and even if you add NFIP, the 30-day waiting period applies.
• Ignoring the 500-year zone. Memorial Day 2013 flooded properties well outside Zone A. The 1% standard is a regulatory line, not a physical one.
• Skipping the § 92.0135 disclosure because the landlord "didn't mention it." The absence of a disclosure doesn't mean the property is safe. It might mean the landlord didn't do their homework. Ask.

Flood risk is one of the few rental questions where the answer is specific to the exact street — not the neighborhood, not the ZIP code. Spend the fifteen minutes to check it before you sign. If you're still searching, browse current rentals at /rentals, filter by the areas you've already map-checked, and read the rest of the renter playbook at /resources before you put down a deposit.