Bats in the House? Orange County Rabies Safety Guide

Never touch a bat with bare hands. That one rule matters more than usual this fall in Orange County. On October 2, the OC Health Care Agency announced that a bat found in an Irvine neighborhood on September 28 tested positive for rabies, and CBS Los Angeles reported that the California Department of Public Health has counted 30 rabid bats in Orange County so far this year.

Bats are usually beneficial neighbors that eat night-flying insects, but they sometimes roost in attics, eaves, and wall voids in homes from Huntington Beach and Newport Beach to Anaheim, Orange, and Mission Viejo. This science-based guide, built on UC Statewide Integrated Pest Management (UC IPM) Pest Notes: Bats and OC Health Care Agency guidance, covers what to do if a bat gets inside, how to spot a roost, and why fall is the right time to seal your home.

Why bats and rabies are in the news in Orange County

The OC Health Care Agency notes that most human rabies cases in the United States in recent years came from bat strains of rabies, and that bat teeth are so small a bite may go unnoticed. Once symptoms begin, rabies is nearly always fatal, but preventive treatment after an exposure is safe and effective.

Keep the risk in perspective. UC IPM reports that in tests of randomly selected bats, no more than 0.5% were rabid, and even rabid bats rarely bite except in self-defense. The bats people pick up are often the sick ones, which is why handling is the real danger.

What to do if you find a bat in the house

The OC Health Care Agency and OC Animal Care recommend these steps:

• Do not touch the bat, and keep children and pets away from it

• Close off the room or area and contact OC Animal Care at (714) 935-6848

• If anyone may have touched the bat or been bitten, call the HCA Communicable Disease Control Division at (714) 834-8180

• Wash any bite or scratch right away with soap and water, flush it well, and call your doctor

• Call your veterinarian if a pet may have had contact with a bat

• Once the bat is gone, close off any openings that let it into the house

A bat found near a sleeping person, a young child, or a pet deserves extra caution, since a bite can go unnoticed. Let health officials decide whether the bat should be tested instead of releasing it yourself.

Signs bats are roosting in your attic or walls

UC IPM says bats can squeeze through openings as small as 1/4 inch. Common roost spots include gaps under eaves, around chimneys, near air and plumbing vents, under roof caps, and loose boards. Watch for:

• Bats flying out of the roofline or eaves just before dark

• Droppings piled under an opening, a vent, or the attic edge

• Dark stains from body oils and urine around a gap, similar to rodent rub marks

• Scratching or squeaking in walls or the attic around dusk

• A musty odor that grows stronger near one part of the house

Bat or mouse droppings? UC IPM explains that bat droppings crush easily and show shiny bits of undigested insects. Mouse droppings lack those shiny bits, and bat droppings are never white or chalky like bird droppings.

Why fall is the right time to bat-proof Southern California homes

In California, UC IPM advises against excluding a bat colony when flightless young may be present, usually May through September. Sealing the parents out then can starve the pups inside and lead to odors and flies. With pup season over, October is a good time to inspect and plan exclusion, and UC IPM notes that winter, after most bats leave in late fall, is ideal for the work.

Mild coastal weather in Orange County keeps insects and bats active later into the year, so a fall roofline check, before winter rains and holiday guests, catches gaps early.

Bat-proofing checklist for Orange County homeowners

• Walk the exterior at dusk and note where any bats exit

• Inspect eaves, vents, chimneys, roof caps, and Spanish tile roof ends in daylight

• Make sure every bat has left before sealing a roost entry for good

• Cap chimneys with 1/2-inch or smaller welded wire mesh, following local spark arrester rules

• Seal holes larger than 1/2 inch and cracks 1/4 by 1 1/2 inches or larger with caulk, foam, or 1/4-inch hardware cloth

• Repair loose window screens and screen doors, and avoid sleeping with unscreened windows open

• Keep pet food indoors so it does not draw wildlife to your home

• Vaccinate every dog and cat against rabies

Skip the gadgets. UC IPM says no pesticides or chemical repellents are registered in California for bats, and every ultrasonic sound device tested has proven ineffective at repelling them.

DIY vs. when to call a wildlife pro for bats

• DIY-friendly: dusk exit watches, screen repairs, chimney caps, pet vaccinations, and sealing small gaps where no bats are roosting

• Call a licensed wildlife or bat exclusion specialist: you see bats leaving the roofline, or droppings keep piling up in the attic

• Call a wildlife specialist: the entry points are high on the roof or in tile you cannot reach safely

• Call a wildlife specialist: an attic needs bat droppings cleaned up, since UC IPM recommends a particle-filtering respirator for anyone cleaning bat or bird droppings

• Get droppings identified: you are not sure whether droppings are from bats, mice, or roof rats

• Call health officials first: anyone may have touched or been bitten by a bat

One more tip: bat bugs look almost identical to bed bugs, UC IPM says, but they cannot reproduce without a bat host and die off soon after bats are gone. If you notice small biting bugs after bats leave an attic, get them identified before treating for bed bugs.

Who to call about bats in Orange County

For a bat inside your home, contact OC Animal Care at (714) 935-6848. If anyone may have touched or been bitten by a bat, call the OC Health Care Agency Communicable Disease Control Division at (714) 834-8180. To seal bats out of an attic or wall, hire a licensed wildlife or bat exclusion specialist, and time the work outside pup season as UC IPM advises.

Halo Home Services does not offer bat inspection, removal, or exclusion, so this guide is for information only. If the droppings you find turn out to be from mice or rats instead of bats, Halo Home Services handles rodents for Orange County homeowners from Huntington Beach and helps families across Southern California. To reach Halo, call 888-377-4256 (888-377-HALO), email Info@halohomeservices.com, or visit us at 16531 Bolsa Chica St #310, Huntington Beach, CA 92649.

Trusted sources

This article summarizes publicly available guidance for homeowners and is not medical advice. For primary detail, see UC IPM Pest Notes: Bats at ipm.ucanr.edu/home-and-landscape/bats, the OC Health Care Agency press release Bat Found in Irvine Tests Positive for Rabies (October 2, 2026) at ochealthinfo.com, CBS Los Angeles reporting on the Irvine bat (October 2, 2026), and CDC rabies information at cdc.gov/rabies. Bat photo by Ann Froschauer, U.S. Fish and Wildlife Service, via Wikimedia Commons (public domain). Never try to kill or poison bats; UC IPM says exclusion is the primary way to manage them.