Post-Storm Rodent Inspection in Houston, TX

Rats and mice live low in Houston, in burrows along bayou banks, in storm drains, under slabs and in ground-level debris, and when the water rises they leave all of it at once and climb. The nearest dry, dark, enclosed place is a garage, a crawl space, a wall void or an attic, and an animal that arrives that way stays if it finds food and a route in and out.

Hurricane Harvey in August 2017 put water into homes across the metro, from the bayou neighborhoods inside the loop to the reservoir communities on the west side, and Houston pest firms reported to local news afterward that rodent populations were the worst they had seen and that rodents had moved into attics. Every smaller flood since has done the same thing on a smaller scale: a hard rain on Brays Bayou sends the rats of Meyerland uphill, a storm drain backing up in the Heights sends them into the nearest crawl space.

The animals that move in after a flood are often Norway rats, the burrowing species that rarely enters an attic in normal conditions. They arrive at ground level, through the garage door seal, the gap under a pier-and-beam skirt, or a weep hole in brick veneer, and a house that has never had a rodent gets one. On slab homes in Katy, Sugar Land and Pearland the entry is the garage corner and the brick weep gap; on older inner-loop homes it is the open crawl space.

The Centers for Disease Control and Prevention ties increases in leptospirosis, a bacterial disease spread through water and soil contaminated with animal urine, to hurricanes and floods, names rodents among the animals that carry it, and lists trapping rodents and keeping food, water and trash in closed containers among its post-flood prevention steps. That is the public-health reason for a rodent check after floodwater has been in or around the house, alongside the practical one.

Wind opens a roofline in four places that matter to a roof rat: the vent hoods, the soffit, the fascia under a dropped limb, and the pipe boots and flashing that were already cracked by the sun. Hurricane Beryl came ashore near Matagorda as a Category 1 hurricane on July 8, 2024, and its winds brought down trees and power lines across the Houston area and left much of the region without power for days. The tree damage is what mattered for rodents.

The limbs are the second half of the problem. Roof rats travel along branches, wires and trunks, according to UF/IFAS, and a storm that leaves a broken limb leaning on the roof has built them a ramp. The inspection lists the limbs that need to come off the roof, and it lists the debris on the ground, which is the next section.

The pile of limbs, fence boards, wet drywall and ruined furniture at the curb after a storm is rodent housing, and in Houston it can sit for weeks before it is collected. A debris pile gives cover, nesting material and, if it includes flooded pantry goods or a spoiled refrigerator's contents, food. Rats displaced from a flooded burrow move into the pile first and into the nearest house second.

After Beryl, tree debris lined streets across the metro while crews worked through it. After Harvey, the piles were the contents of whole houses. In both cases the pile at the curb was a few yards from a garage door with a worn seal and a soffit with a new hole in it.

What the inspection recommends about debris is practical. Keep the pile as far from the house as the lot allows. Keep food waste out of it and in a lidded container. Stack limbs in a loose row instead of a heap, so there is less enclosed space inside. Once the pile is gone, walk the ground where it stood and look for burrow entrances, which show as clean holes with a fan of loose soil. The contractor we route checks the same spots on the return visit.

The first sign after a storm is usually noise in the attic or the garage ceiling a week or two later, once the animals have found the house and settled, and by then the droppings have started. Storm-season rodent signs look like ordinary ones with a few additions.

• Droppings on the garage floor, along the water heater platform or on top of stored boxes. Roof rat droppings measure a quarter to half an inch with pointed ends, per UF/IFAS; Norway rat droppings are larger and blunt.
• Scratching or running overhead at night, in a house that was quiet before the storm.
• Gnawing on the corner of a garage door seal, on cardboard from the cleanup, or on the wiring of a generator or a sump pump.
• A mud line in the crawl space or garage with tracks and tail drags through it.
• Fresh burrows in saturated ground at the slab edge, at the base of a pier, or under a debris pile.
• Insulation pushed aside under a vent that lost its hood, or a tunnel in wet cellulose.
• A smell that arrives after a neighbor put out bait.

Many people after a storm are already sleeping badly, in a house that feels less like theirs than it did, and the sound overhead lands harder for it. The inspection replaces another week of listening.

The storm openings get closed first, with metal, and the trapping runs alongside so that anything already inside comes out through a trap instead of chewing a new exit. Bait is the wrong first move after a storm for the same reason it is the wrong first move any other time, and after a flood there is an extra one: a poisoned rat dying in a wall that is already wet is a cleanup problem on top of a repair problem.

Where the roof deck itself is damaged, a roofer handles the deck and the contractor we route handles the rodent-proofing of the vents, soffit and penetrations, and the two are coordinated so the attic is closed once. Wet insulation is a separate finding; the attic cleanup page covers what happens to cellulose that has been rained on and nested in.

Walk the roofline and the garage as soon as it is safe to be on a ladder, and book the inspection within the first couple of weeks, because that is the window in which displaced animals are still looking for a place and have not yet committed to yours. After that point the job becomes removal as well as sealing.

Two things set the pace. Rats that have been flooded out are moving the same night, so the garage door seal and the crawl space skirt matter immediately. Roof rats reach a wind-opened vent as soon as they find it, and a colony that settles in an attic in the first month is breeding by the second: UF/IFAS gives a 21 to 23 day gestation and litters of 5 to 8, with 4 or 5 litters a year, and Houston's mild winters give no pause. HomeGuide puts trapping a handful of animals at 2 to 3 days and a heavy infestation at 1 to 2 months, so the difference between an early check and a late one is measured in weeks of trapping.

An inspection is worth booking after any named storm, after any flood that reached the yard, and after a wind event that brought limbs down on the block even if the house looks fine from the street. A vent hood is hard to see from the ground.

The inspection is free, and the work that follows is priced from the written findings against the same Houston bands as any other rodent job: Angi puts a Houston rat exterminator job at about $831 on average, with most homeowners paying $381 to $1,370, and exclusion at $430 to $1,300. Storm jobs sit at the low end when the inspection finds one lifted vent and no animals, and at the high end when a flooded crawl space and a limb-opened soffit both have occupants.

What moves the number after a storm: how many openings the wind made, whether the attic or crawl space is occupied, whether the insulation is wet, and whether a roofer is already scheduled so the rodent-proofing can be coordinated. Roof repair itself is a roofer's line and an insurance conversation; ask the contractor which items on the rodent quote are worth photographing for the claim file. Get the sealing, the trapping and any cleanup as separate lines.

Houston gets about 50 inches of rain a year, hurricane season runs June through November, and the rodent population breeds all year, so a storm here lands on animals that are already numerous and already near the house. The housing stock decides where they get in.

Bayou neighborhoods and pier-and-beam houses

The Heights, Montrose, Woodland Heights, Garden Oaks, Oak Forest, Eastwood, Meyerland and Bellaire sit on Buffalo, White Oak and Brays bayou drainage and were largely built before 1970 on pier-and-beam foundations. When the bayou rises the crawl space floods, the Norway rats burrowed along the bank move up, and an open or torn skirt is the way in. Meyerland has flooded from Brays Bayou repeatedly; the Meyerland page goes into that history. Above, the same houses sit under mature live oaks that a hurricane throws onto the soffit.

Slab subdivisions and the wind

Spring Branch, Memorial, Katy, Sugar Land, Pearland, Cypress and The Woodlands are slab-on-grade, so flood displacement enters at the garage corner and the brick weep gap instead of a crawl space. The bigger post-storm issue there is wind on a vented composition-shingle roof: turbine and mushroom vents, pipe boots that Houston sun has already cracked, and soffit under pines and oaks. Memorial lost pines in Beryl.

Humidity and insulation

Rain through a stripped roof lands on blown cellulose or fiberglass, and at Houston's average humidity of around 73 percent, cellulose does not dry. The Department of Energy notes that wet insulation performs poorly and that compressed insulation does not deliver its rated R-value. Wet, nested cellulose after a storm is usually a remove-and-replace finding, covered on the attic insulation replacement page.

Licensing after a storm

Storm season brings out-of-town crews, and the rule for rodent work does not change: any business that controls rats and mice for hire in Texas needs a Texas Department of Agriculture business license and a certified applicator, with the TPCL number on the vehicle. Live trapping alone has been exempt since 2009 under Occupations Code Sec. 1951.058, but anyone placing bait needs the license. Every contractor we route holds the TDA license the job needs.

After a storm the people knocking on doors outnumber the licensed ones, so ask for the TPCL number, confirm it with the Texas Department of Agriculture before anyone starts, and get the findings in writing before the quote. TDA's own guidance to homeowners is to ask for credentials and check license status before signing anything.

1. The business TPCL number and the applicator's name, confirmed with TDA.
2. A written list of the openings found, each with a location and a proposed material, before a price is discussed.
3. An itemized quote: sealing, trapping, follow-up visits, any cleanup, each on its own line.
4. What the warranty on the sealing says, how long it runs, and whether storm damage after the work is covered or excluded.
5. How many follow-up visits are included and what happens if activity continues.
6. Whether the contractor will coordinate with the roofer and the insurance adjuster, and what to photograph.
7. Proof of liability insurance, since the work is on a ladder on a damaged roof.

The about page explains what the contractors we route are expected to put in writing, and the contact page has the phone line, which is answered 24 hours a day through storm season and after it.

Most Houston jobs run as a sequence, and these pages describe the steps on either side of this one.

• Rodent Exclusion: Closing the roofline, brick weeps, vent boots and crawl-space skirting in steel and metal.
• Rat Removal: Trapping roof rats out of the attic and Norway rats out of the crawl space, sequenced with sealing.
• Attic Cleanup and Decontamination: Removing droppings, nests and urine-soaked insulation, then sanitizing the attic.

How the pieces fit together is covered on the about page, or by phone at any hour.