A county pocket with three city neighbors
On Census maps, North El Monte is a compact shape of about 0.43 square miles whose edges touch three different cities: Arcadia, El Monte and Temple City. Some 4,086 people live here in 1,265 households, according to the Census Bureau's 2020–2024 estimates, and the median resident is about 45 years old. Because the community is unincorporated, public health and environmental health services come from Los Angeles County rather than from a city hall.
The county's planning department groups North El Monte with nearby unincorporated areas, including East Arcadia and Mayflower Village, under the name South Monrovia Islands. Its profile of that group matches what you see on these blocks: land that is overwhelmingly single-family residential, and housing that mostly comes from postwar tract building, with about 83% of homes across the group built before 1979.
Being this small has a practical side effect: public pest and disease reports rarely mention North El Monte by name. Wherever this page leans on figures from El Monte, Arcadia or Temple City, we say so — those numbers describe the neighbors, not this community.
Sources: [1][2][3]
What a 1957 median build year means inside the walls
Of the roughly 1,297 homes the Census counts here, 1,166 are detached houses. The remainder is a short list: a few dozen attached homes, a handful of duplex units and two small groups of apartments in buildings of 10 to 19 and of 50 or more units. The median year built, 1957, puts North El Monte among the older housing in this part of the San Gabriel Valley.
Houses approaching 70 years old tend to fail in familiar places. Screens on attic and foundation vents rust through or tear, eaves open where fascia boards have shrunk, and original drain lines may have cracked joints or loose cleanout caps. Those are the routes a roof rat uses to reach an attic and an American cockroach uses to climb out of a sewer line. No local reports document these problems in North El Monte, but they are the ones we would expect to find in homes of this age.
About 36% of households rent rather than own — 454 of 1,265. In rented houses and the few apartment buildings, German cockroaches can arrive inside moving boxes, used appliances or a new tenant's belongings, and they settle into kitchen cabinets and the space behind the refrigerator instead of coming in from outdoors.
Sources: [1]
Washes, a spreading basin and backyard travel routes
Census mapping shows the Santa Anita Wash, the Arcadia Wash and the Rio Hondo all passing within about half a mile of North El Monte, along with a spreading basin — a facility that holds stormwater so it can sink back into the groundwater. County planners also note that a bike and pedestrian path crosses North El Monte and Mayflower Village, and they name the Peck Road Water Conservation Park and Pamela Park among the green spaces close by.
In its 2024 West San Gabriel Valley Area Plan workshop, the county proposed walking paths along the existing washes in this group of communities and keeping the Sawpit Wash as a wildlife corridor. For the houses nearby, those long strips of channel, fence line and vegetation likely double as travel lanes for rats moving from one yard to the next.
The county's rodent advisory lists the basics that matter most on blocks like these: close any opening wider than about a quarter inch, pick up fruit that falls from backyard trees, and bring pet food indoors at night. Those are the first things we look at when we inspect a North El Monte house, along with the full roofline.
Sources: [2][3][4][13]
Fleas, rats and a record county typhus year
Los Angeles County Public Health counted 220 flea-borne typhus cases in 2025, up from 187 the year before and the highest total on record; close to nine in ten patients were hospitalized. The clusters the county identified were in Central Los Angeles, Santa Monica and Willowbrook, not in the San Gabriel Valley, so this is a county-wide warning rather than a North El Monte statistic.
The county's advice is to keep pets on flea control all year, keep trash covered and block animals from getting into crawl spaces and attics. Its rodent guidance adds a sequencing detail that is easy to overlook: get fleas under control before trapping rats. That is why we plan rodent work and flea treatment together instead of as separate jobs.
Sources: [12][13]
Mosquito data: what the neighbors' traps show
North El Monte does not appear by name in the San Gabriel Valley Mosquito & Vector Control District's West Nile tables for 2021 through 2025, but the cities around it do. The City of El Monte had 2 positive mosquito samples in 2021, 11 in 2022, 1 in 2024 and 4 in 2025 — and in 2025 an El Monte trap gave the district its first positive of the season, on July 22, in a year with only 8 positives district-wide. Arcadia logged 14 positives in 2022 and Temple City 6 that same year. In 2021 the district also reported 2 positive samples from Mayflower Village, an unincorporated neighbor in the same county planning group.
The California Department of Public Health lists both invasive species, Aedes aegypti and Aedes albopictus, as present in El Monte, Arcadia and Temple City; North El Monte has no entry of its own. These small, daytime-biting mosquitoes breed in the water held by plant saucers, buckets and similar containers, and they can spread dengue. The district reported 11 locally acquired dengue cases in the San Gabriel Valley in 2024, two of them in the City of El Monte.
PesPro does not provide mosquito control. Public mosquito surveillance and treatment are handled by vector control districts, and because district listings do not name every unincorporated community, the most reliable step is to look up your address through Los Angeles County to find the district that serves it. In the meantime, emptying standing water around the yard every week does the most good.
Sources: [9][8][7][5][6][11][10]
Explaining the plan in English, Spanish or Chinese-language pages
North El Monte is one of the more multilingual communities we serve. Census estimates show that about 27% of residents age five and older speak Chinese at home, and roughly seven in ten of them speak English less than very well; another 18% speak Spanish at home. About 41% of residents were born outside the United States.
Our team speaks English and Spanish, so inspection findings, preparation steps and follow-up instructions can be explained on site in either language. Chinese-reading households can learn about our services in Chinese at pespro.com/zh, and Spanish readers can use pespro.com/es.
Sources: [1]
