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Rodent Control and Roof Rat Removal in San Marino

Roof rats in San Marino tend to arrive from above: up a trunk, across a branch and onto the roof. We close the openings in older rooflines and attics, trap the rats already inside and clean the areas they used.

The median San Marino home dates to 1943. Houses that age often have original vents, chimney gaps and crawl-space openings that a young rat can squeeze through.

Technician on a ladder inspecting a heavy tree limb that rests on the clay-tile roof of an older two-story home, marking where the branch gives rats access

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Pest Control PESPRO β€” 12207 Chosen St, El Monte, CA 91733, about 6.1 miles from San Marino
Office phone
(323) 303-3522
Certification
QualityPro certified (National Pest Management Association)
Reputation
4.9 stars from 132 Google reviews Β· 15+ years in business
Hours
Mon–Fri 8AM–6PM, Sat 9AM–3PM Β· 24/7 emergency line

A tree canopy that reaches the roof

San Marino's tree cover is part of its identity; the city's own Lacy Park was designed as a botanical garden with trees donated from the Huntington estate. On private lots, old oaks, camphors, citrus and climbing vines are likely to give roof rats both shelter and food, and branches resting on a roof let them skip the ground entirely.

We note every limb, vine and utility line that touches the house and mark which ones to cut back. For large or valuable trees, check with the City of San Marino about permit rules and use a qualified arborist; our role is to show where the access points are and to seal the house itself.

Sources: [14]

Attics, chimneys and crawl spaces in 1940s houses

With a median build year of 1943, many San Marino homes have features that newer tracts don't: raised wood floors over crawl spaces, brick chimneys, open rafter tails, original louvered vents and additions joined to the old structure decades later. Each junction is a probable gap.

We seal with galvanized mesh, hardware cloth and sheet metal cut to fit the existing materials, so the work blends with older trim and tile. Traps go in at the same time, and we keep checking them until there are no new captures, so no rats are left sealed inside the walls or attic.

Sources: [1]

Sanitation, fleas and the county's typhus record

Los Angeles County Public Health reported 220 flea-borne typhus cases in 2025, the most ever recorded and up from 187 the year before. The fleas involved travel on rats and opossums, and the county advises keeping wildlife out from under homes and using flea control on pets all year. These are county-wide numbers, not San Marino cases.

After rats are removed, we clear droppings and nesting material from attics and crawl spaces and sanitize the affected areas. In houses with raised floors, closing the crawl-space vents also keeps opossums out, which is likely to reduce the flea load around the home.

Sources: [17]

Signs you need rodent control in San Marino

Footsteps overhead at dusk

Running or scratching above the ceiling soon after dark, when roof rats begin to move.

Chewed fruit left on the tree

Oranges or avocados hollowed out with only the rind still hanging.

Smudges along rafters

Greasy dark lines where rats repeatedly brush against wood in the attic.

Droppings in the attic or garage

Pointed, dark pellets near insulation, stored boxes or bags of birdseed.

How we handle rodent control in San Marino

1. Roof-to-foundation survey

We walk the property from the canopy down, then inspect the attic, crawl space and garage for entry points and activity.

  • Branches and vines touching the house
  • Chimney, vents and rafter tails
  • Crawl-space and foundation openings
  • Photos of every entry point

2. Exclusion and trapping

Openings are closed with metal materials while traps remove the rats already inside.

  • Galvanized mesh and sheet metal
  • Materials matched to older trim
  • Traps in secured locations
  • Checks until captures stop

3. Cleanup and monitoring

Droppings and nests are removed, surfaces are sanitized and the property is watched for new activity.

  • Nest and droppings removal
  • Sanitizing of affected areas
  • Exterior monitoring
  • Follow-up inspection

Pest reports in and around San Marino

Public-health notices, vector-control alerts and local news we track for this area. Summaries are ours; follow each link for the original report.

Β· Greater Los Angeles County Vector Control District

West Nile Virus Activity 2026

The district's 2026 table lists San Marino with 4 positive mosquito samples, the first detected on September 22, 2026; no positive dead birds from the city.

Read the original

Β· San Marino Tribune (Outlook Newspapers), archived by the Wayback Machine

Fumigators Help City Hall Work the Bugs Out

City Hall was tented over Thanksgiving 2020 because termites had returned after a 2012 fumigation, alongside spiders and a pipe-dwelling gnat; fumigation and repairs cost $84,200.

Read the original

Β· Greater Los Angeles County Vector Control District

West Nile Virus Update: Additional Positive Mosquito Samples Confirmed

Press release confirming two positive mosquito samples from the City of San Marino (91108), which brought the district's season total to three.

Read the original

Β· FOX 11 Los Angeles (City News Service)

Mosquitoes collected in San Marino test positive for West Nile virus

TV news report on the district's announcement that two of the county's first three positive samples of 2022 came from San Marino.

Read the original

Β· San Marino Tribune (Outlook Newspapers), archived by the Wayback Machine

Town Hall Meeting Discusses Tips for Wildlife Management

At a May 2019 city town hall, the vector control district said the invasive Aedes mosquito had reached San Marino and nearby areas and urged weekly checks of containers; peafowl and coyotes were also discussed.

Read the original

Β· Los Angeles County Department of Public Health Β· regional

Public Health Reports All-Time High of Flea-Borne Typhus Cases

Los Angeles County recorded a record 220 flea-borne typhus cases in 2025, up from 187 in 2024, and advises year-round pet flea control and keeping opossums and rodents from under homes.

Read the original

Rodent Control in San Marino: common questions

Sources

  1. US Census Bureau, American Community Survey (via Census Reporter), β€œSan Marino city, CA β€” ACS 2020–2024 5-year estimates” (2024). https://censusreporter.org/profiles/16000US0668224-san-marino-ca/
  2. Greater Los Angeles County Vector Control District, β€œWest Nile Virus Activity 2026” (2026-10-19). https://www.glamosquito.org/west-nile-virus-activity-2026
  3. Greater Los Angeles County Vector Control District, β€œWest Nile Virus Activity 2025” (2025). https://www.glamosquito.org/west-nile-virus-activity-2025
  4. Greater Los Angeles County Vector Control District, β€œWest Nile Virus Activity 2024” (2024). https://www.glamosquito.org/west-nile-virus-activity-2024
  5. Greater Los Angeles County Vector Control District, β€œWest Nile Virus Activity 2023” (2023). https://www.glamosquito.org/west-nile-virus-activity-2023
  6. Greater Los Angeles County Vector Control District, β€œWest Nile Virus Activity 2022” (2022). https://www.glamosquito.org/west-nile-virus-activity-2022
  7. Greater Los Angeles County Vector Control District, β€œWest Nile Virus Activity 2021” (2021). https://www.glamosquito.org/west-nile-virus-activity-2021
  8. Greater Los Angeles County Vector Control District, β€œWest Nile Virus Update: Additional Positive Mosquito Samples Confirmed” (2022-07-05). https://glacvcd.org/files/d13070fc5/PR_20220705_WNV+Update.pdf
  9. FOX 11 Los Angeles (City News Service), β€œMosquitoes collected in San Marino test positive for West Nile virus” (2022-07-05). https://foxla.com/news/san-marino-mosquitoes-west-nile-virus
  10. Spectrum News 1, β€œMosquitoes collected in San Marino test positive for West Nile virus” (2022-07-05). https://spectrumnews1.com/ca/la-west/health/2022/07/05/mosquitoes-collected-in-san-marino-test-positive-for-west-nile-virus
  11. San Marino Tribune (Outlook Newspapers), archived by the Wayback Machine, β€œWest Nile Virus Found in San Marino” (2022-07-21). https://web.archive.org/web/20220813085446/https://sanmarinotribune.outlooknewspapers.com/2022/07/21/west-nile-virus-found-in-san-marino/
  12. San Marino Tribune (Outlook Newspapers), archived by the Wayback Machine, β€œTown Hall Meeting Discusses Tips for Wildlife Management” (2019-05-10). https://web.archive.org/web/20221202122430/https://sanmarinotribune.outlooknewspapers.com/2019/05/10/town-hall-meeting-discusses-tips-for-wildlife-management/
  13. San Marino Tribune (Outlook Newspapers), archived by the Wayback Machine, β€œFumigators Help City Hall Work the Bugs Out” (2020-12-04). https://web.archive.org/web/20240815161710/https://sanmarinotribune.outlooknewspapers.com/2020/12/04/fumigators-help-city-hall-work-the-bugs-out/
  14. City of San Marino, β€œLacy Park Centennial” (2025). https://sanmarinoca.gov/community/lacy_park_centennial.php
  15. City of San Marino, β€œPeafowl Abatement Program Update” (2020-06-01). https://sanmarinoca.gov/government/departments/community_development/peafowl_management.php
  16. San Gabriel Valley Mosquito & Vector Control District, β€œWho We Are” (2026). https://sgvmosquito.specialdistrict.org/overview
  17. Los Angeles County Department of Public Health, β€œPublic Health Reports All-Time High of Flea-Borne Typhus Cases” (2026-04-02). https://lacounty.gov/2026/04/02/public-health-reports-all-time-high-of-flea-borne-typhus-cases/
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