Below Average
#7568 of 9,539 schools in CA
William Tell Aggeler Opportunity High
High School · Los Angeles Unified
21050 Plummer St., Chatsworth, CA 91311
Enrollment
68
Student-Teacher
17:1
Score
4.8
Grades
7th – 12th
Enrollment
68
Student-Teacher
17:1
Score
4.8
Grades
7th – 12th
Data vintage
2022-23
Data vintage2022-23
How this school compares
California schools
#7,568 of 9,539
In Chatsworth
#8 of 8
public schools
In district
#720 of 769
Los Angeles Unified
School environment
9.6 / 10
Excellent
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William Tell Aggeler Opportunity High
High School in Chatsworth · grades 7th – 12th. Start here, then compare fit against nearby and district options.
Aggeler Community Day
0.0 mi away. Use as a geographic alternative in the same move search.
Stoney Point Continuation
0.7 mi away. Use as a geographic alternative in the same move search.
About William Tell Aggeler Opportunity High
William Tell Aggeler Opportunity High is a public high school in Chatsworth, CA, part of Los Angeles Unified. William Tell Aggeler Opportunity High serves approximately 68 students, and covers grades 7th-12th, and has a 17:1 student-teacher ratio. William Tell Aggeler Opportunity High has a current MySchoolScout rating of 4.8 out of 10 and ranks #7,568 of 9,539 schools in CA.
Structured state assessment records for William Tell Aggeler Opportunity High show 5% math proficiency (multi-year average, 2009-2024) and 6% reading/ELA proficiency (multi-year average, 2009-2024).
- This school 4.8 · Below Average
- District avg 6.7
- CA avg 6.5
What Parents Should Know
At 68 students, William Tell Aggeler Opportunity High is on the smaller side. That usually buys more individual attention and teachers who know every kid by name, with the trade-off of fewer electives and extracurriculars than a larger school can staff. Ask what activities it actually offers.
Test scores at William Tell Aggeler Opportunity High sit below average, but its growth scores are strong: students here make above-average progress year over year. The raw numbers haven't caught up, but a school that keeps moving kids forward is doing the harder, more important work.
Score Breakdown
Full Profile · 4/4 metricsView breakdown
View breakdown
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William Tell Aggeler Opportunity High — Students at William Tell Aggeler Opportunity High score 0% proficient, which is below what's typical for similar communities (expected: 23%).
Equity & Diversity
Shown separately, not included in overall scoreFree/Reduced Lunch
91.2%
Students qualifying for federal meal assistance
Test Scores CA CAASPP (2023-24)
Based on 20 test records from CA state assessments. About our data
Proficiency Trend
Average proficiency (% at or above grade level) across Math & ELA over time.
Source: EdFacts (NCES) and state assessment data. Growth score: 8.5/10.
How William Tell Aggeler Opportunity High Compares
See how William Tell Aggeler Opportunity High performs across key quality dimensions compared to state benchmarks.
Funding & Resources
Programs & Offerings
Data as of 2021-22 · Source: CRDC via Urban Institute · Learn more
Location
21050 Plummer St., Chatsworth, CA 91311
Nearby Alternatives
Families considering William Tell Aggeler Opportunity High may also want to explore other high schools in the area. Chatsworth Charter High (rated 7.5/10, 0.8 miles away), which scores notably higher. Additionally, Stoney Point Continuation (rated 5.6/10, 0.7 miles away), which scores slightly higher. For more schools in Chatsworth, see our Chatsworth schools guide .
Nearby Schools
20 within 1.8 miNeighborhood Census ACS (2019-2023)
Census data for ZIP 91311 (ACS 2019-2023 5-Year Estimates) · Data sources
Median Income
$117,574
Median Home Value
$837,300
Median Rent
$2,199/mo
Population
40,557
College Educated
44.9%
Homeownership
66.8%
Avg Commute
29.1 min
Poverty Rate
7.6%
Median Age
42.3
Similar Schools
Schools in the same state with comparable level, size, and ratings
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| EAST VALLEY EDUCATION CENTER Oakdale, CA | 4.8 |
| LOS ANGELES COMPUTER SCIENCE ACADEMY Los Angeles, CA | 4.8 |
| Costanoa Continuation High Santa Cruz, CA | 4.7 |
| Phoenix High San Jose, CA | 4.7 |
| Ark Independent Studies Santa Cruz, CA | 4.9 |
| DUBNOFF CENTER FOR CHILD DEVELOPMENT North Hills, CA | 4.9 |
Frequently Asked Questions
Common questions about William Tell Aggeler Opportunity High
What grades does William Tell Aggeler Opportunity High serve?
William Tell Aggeler Opportunity High serves students in grades 7th through 12th.
How many students attend William Tell Aggeler Opportunity High?
William Tell Aggeler Opportunity High has an enrollment of approximately 68 students.
What is the student-teacher ratio at William Tell Aggeler Opportunity High?
The student-teacher ratio at William Tell Aggeler Opportunity High is 17:1. A lower ratio generally means more individual attention per student. The national average is approximately 16:1 for public schools.
How does William Tell Aggeler Opportunity High rank in CA?
William Tell Aggeler Opportunity High ranks #7,568 of 9,539 schools in CA.
What is William Tell Aggeler Opportunity High's MySchoolScout rating?
William Tell Aggeler Opportunity High has a current MySchoolScout rating of 4.8 out of 10. This score combines the level-appropriate components shown in the rating breakdown; equity data is shown separately for context.
What are the test scores at William Tell Aggeler Opportunity High?
Based on loaded state assessment records, William Tell Aggeler Opportunity High has 5% math proficiency (multi-year average, 2009-2024) and 6% reading/ELA proficiency (multi-year average, 2009-2024).
Is William Tell Aggeler Opportunity High a charter school?
No, William Tell Aggeler Opportunity High is not a charter school. It is a traditional public school operated by the local school district.
Is William Tell Aggeler Opportunity High a Title I school?
No, William Tell Aggeler Opportunity High is not currently a Title I school.
What does the Free & Reduced Lunch percentage mean for William Tell Aggeler Opportunity High?
91.2% of students at William Tell Aggeler Opportunity High qualify for free or reduced-price lunch. This is a commonly used indicator of economic need and provides important context when interpreting test scores.
Neighborhood Context
Powered by 
Quick Facts NCES CCD (SY 2022-23)
- Grades
- 7th – 12th
- Enrollment
- 68
- Student-Teacher Ratio
- 17:1
- Teachers (FTE)
- 4
- Free/Reduced Lunch
- 91.2%
- Type
- alternative
- Setting
- Large City
- County
- Los Angeles County
- Phone
- (818) 341-1232
- 4-Year Graduation
- ≤10%
Resources & Links
District
Los Angeles Unified- District Enrollment
- 419,929
- Schools in District
- 785
- Per-Pupil Spending
- $22,687
- District Rank
- #720 of 769
Other Schools in This District
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