Historic homes and the openings that come with age
Sierra Madre traces its start to February 1881, when Nathaniel Carter bought 1,103 acres at the base of the mountains, and residents voted 71–25 to incorporate in 1907. The city's July 2024 list of designated historic landmarks has 59 entries, among them the Wilson-Bixby House from 1881, a 1908 Craftsman bungalow on North Baldwin Avenue and a group of canyon cabins on Woodland Drive built between 1913 and 1922. Census estimates put the median year built for all local housing at 1959, and about 60% of homes are detached houses.
Age alone does not cause pest problems, but it tends to leave openings: crawl-space vents with tired screens, wood siding that has shrunk away from its trim, attic louvers, and pipe holes cut during decades of plumbing updates. Those are the spots where mice, roof rats, German cockroaches and wall-nesting wasps are most likely to get in, so on an older Sierra Madre house we look at the crawl space, attic and roofline, not only the room where something was seen. If the technician notices signs that could point to termites, such as discarded wings or small piles of pellets, we note them in your findings so you can arrange a dedicated termite inspection.
On landmark and other character homes, we agree on where any mesh or sealing will go before work starts, so repairs stay as discreet as possible.
Sources: [13][14][12]
Canyon and foothill lots in the Very High fire zone
CAL FIRE published a revised fire hazard map in March 2025, and on May 27, 2025 the City of Sierra Madre adopted it. Foothill and canyon areas are designated Very High Fire Hazard Severity Zones, where property owners must keep at least 100 feet of defensible space.
Fire safety and pest prevention often point in the same direction. Firewood and lumber stacked against a wall, shrubs pressed into the siding and limbs resting on the roof are fire concerns, and they are also the kind of cover and travel routes roof rats and mice are likely to use. When we suggest trimming or clearing to reduce rodent activity, those suggestions always fit within the fire department's defensible-space requirements.
Sources: [15]
Bears, latched bins and the city's wildlife-feeding ban
Sierra Madre shares its northern edge with wild land, and the city actively manages what comes down the slopes. Between early July and mid-August 2023 it logged 122 bear calls, about what it usually receives in a whole year, including 30 cases of a bear entering a structure, and the city approved a resolution declaring bear management a public-safety risk. In June 2024 police received five reports in under two hours as a bear got into four homes and a garage; no one was hurt. And in early 2025, a bobcat found in Sierra Madre with burns on all four paws after the Eaton Fire was cared for by Pasadena Humane and released back in the city that June.
City ordinance 6.10.030 makes it illegal to leave out trash, pet food or any other food that feeds wildlife. The city's wildlife page asks residents to keep their bear-resistant containers from Athens Services latched on non-collection days, put food scraps in the green bin, pick up fallen fruit right away and bring small pets indoors from dusk to dawn.
That guidance is written for bears and coyotes and does not mention rodents. Still, the same leftovers — an unlatched bin, kibble on the patio, fruit rotting under a tree — are likely to feed roof rats and mice too, so following the ordinance probably helps with rodents as well. PesPro does not handle bears, coyotes, bobcats or other wildlife; for those, contact the Sierra Madre Police Department, which runs the city's wildlife management program. Our work is rodents and insects.
Sources: [17][18][19][16]
West Nile virus detections in Sierra Madre, year by year
Sierra Madre is a member city of the San Gabriel Valley Mosquito & Vector Control District, which works year-round across about 287 square miles of the county. The district's records show West Nile activity inside the city on and off: a dead bird that tested positive in September 2021, three positive mosquito samples in 2022 (the first reported August 1) and three more in 2023 (the first on July 11). Sierra Madre did not appear in the district's 2024 or 2025 tables, but a positive sample first detected on October 6, 2026 was the most recent entry in its 2026 table. The pattern goes back further: in 2012, a dead crow found in Sierra Madre was the first sign of the virus in the San Gabriel Valley that year.
After the January 2025 Eaton Fire, the district began monitoring swimming pools in the fire area that could no longer be maintained, since one neglected pool can produce up to 3 million adult mosquitoes a month. By June 2026 it had identified 1,475 such pools, had 912 under supervision and had stocked mosquitofish in 559. The district also finds the invasive Aedes aegypti in its traps. In 2016 a district scientist said the related Aedes albopictus had not yet reached Sierra Madre, but that is an old snapshot, and we have not found a current city-level report either way.
PesPro does not provide mosquito control. To report a neglected pool, standing water or heavy biting, contact the district at (626) 814-9466 or SGVmosquito.org. During our visits we do mention any standing water we notice.
Sources: [7][6][5][4][3][2][1][9][8][10]
Flea-borne typhus and what pets bring home
Los Angeles County Public Health counted 220 flea-borne typhus cases in 2025, the most on record and up from 187 in 2024, and nearly nine in ten patients were hospitalized. The localized outbreaks the county described were in Central LA, Santa Monica and Willowbrook; no public report ties cases to Sierra Madre.
The prevention advice still suits foothill homes: treat pets for fleas year-round, keep pet food indoors and seal openings into crawl spaces and basements. The first two line up with what the city already asks under its wildlife rules, and the third is part of the rodent exclusion we do, so for households with dogs or cats we often plan flea treatment and rodent work together.
Sources: [11][16]
