Arroyo High

Arroyo High is a big secondary school in El Monte, California, run under El Monte Union High. The school works with 1,638 students in grades 9 through 12. That puts it 95% above the typical public school in California, which averages around 838 students.

Across the 7 schools in El Monte Union High (7,278 students total), Arroyo High accounts for its share of the district's footprint.

For racial and ethnic makeup, Arroyo High logs that the largest single group is Hispanic, at 72% of enrollment. Beyond that, the school lists 25% Asian. The wider county runs roughly 48% Hispanic, putting the school's mix meaningfully more Hispanic than the area baseline.

In terms of school funding signals, On paper, Arroyo High has 78 full-time-equivalent teachers, translating to a class-load average of around 21.1:1. Statewide, the average ratio sits near 18.2:1, putting Arroyo High higher than the state norm the norm. An estimated 84% of students are eligible for free or reduced-price lunch, a number frequently used as a low-income enrollment indicator. That share is north of Los Angeles County's rate of about 70%.

On a demographically-adjusted basis, Arroyo High sits in the top 10% of California schools after the BeatsExpectations adjustment. Predicted proficiency for the school's FRL share is roughly 29.4%; actual is 49.5%, +20.1 points clear of the demographic baseline.

In the broader community, Los Angeles County reports that median household income runs about $90,112, roughly 36% of adults have completed at least a four-year degree, and the poverty rate sits near 10%. In all, Los Angeles County runs 2244 public schools (combined enrollment of about 1,265,907 students), of which Arroyo High is one.

The closest other public school is El Monte Union High School Community Day, roughly 0.2 miles away. Within five miles, there are 8 other public schools. On composite proficiency, Arroyo High comes 4th of 8 in the immediate cluster, higher than the nearby-schools average of 44.8%.

Geographically, the school is in a bedroom-community area.

Over the past 7-year window. Over the past 7-year window, the student count contracted 24%: 2,161 students in 2018 compared to 1,638 in 2025. Class-load math has tightened: from 22.8:1 in 2018 to 21.1:1 in 2025.

On this page, posts here usually surface around fundraisers, lost-and-found posts, and report-card season. Anyone with firsthand experience at this school can post or comment.