Below Average
#7568 of 9,539 schools in CA
William Tell Aggeler Opportunity High
High School · Los Angeles Unified · Chatsworth, CA
A Los Angeles Unified high school where students score 23 points below what's typical for similar communities.
21050 Plummer St., Chatsworth, CA 91311
- Math 0% vs CA 32% (2024)
- Reading 0% vs CA 52% (2024)
- ≤10% 4-year graduation
Academics
Full Profile · 4/4 metricsView breakdown
View breakdown
View breakdown
View breakdown
Students at William Tell Aggeler Opportunity High score 0% proficient, which is below what's typical for similar communities (expected: 23%).
2024 CAASPP proficiency
Most recent published year. School vs. CA average.
Trend
→ SteadyProficiency is down 5 points across the 11-year record (2009–2019) and has held near 5% recently.
Show all 9 years
Multi-year averages used by the rating model: math 5% (multi-year average, 2009-2024) · reading/ELA 6% (multi-year average, 2009-2024)
Based on 20 test records from CA state assessments and EdFacts (NCES).
Equity & diversity
Shown separately, not included in the overall scoreFree/reduced lunch
91.2%
Students qualifying for federal meal assistance
How we rate schools
A clear 1–10 score built from public data — growth, academics, and learning environment. No hidden criteria, no pay-to-play.
See how we rateThe neighborhood
Where William Tell Aggeler Opportunity High sits, and what the surrounding area looks like.
Nearby same-level schools are colored by their score. Pins are locations, not attendance boundaries. Open the Los Angeles map →
Getting around & local context
- Walk 37Car-Dependent
- Transit 49Some Transit
- Bike 56Bikeable
- County Safety: Low245/100K
Powered by
FBI Uniform Crime Reporting · 2024 · county context, not school-level safety or attendance eligibility. Source details
Source period: 2024. A newer release may be available.
Area profileU.S. Census ACS 5-year estimates (ACS 2019–2023 5-year estimates)
Median income
$117,574
Median home value
$837,300
Median rent
$2,199/mo
College educated
44.9%
Homeownership
66.8%
Poverty rate
7.6%
ACS 2019–2023 5-year estimates for the ZCTA associated with school ZIP 91311; this is area context, not an attendance boundary.
Programs & students
Programs & Offerings
Compare nearby
Nearby same-level schools
4 from a 5-mile search; district fallback available
| School | Score | Grades | Distance | Enrollment | Compare |
|---|---|---|---|---|---|
| Aggeler Community DayEnrollment path unverified | Not rated | 7–12 | 0.0 mi | 19 | Compare → |
| Stoney Point ContinuationEnrollment path unverified | 5.6 | 9–12 | 0.7 mi | 120 | Compare → |
| Chatsworth Charter HighCharter · enrollment unverified | 7.5 | 9–12 | 0.8 mi | 1,724 | Compare → |
| Academy for Advancement of Children With AutismPrivate · tuition | Not rated | K–12 | 1.5 mi | 30 | Compare → |
Distance is proximity only; it is not attendance eligibility.
Enrollment path unverified: Potential public school; its attendance or application path has not been classified.
Charter · enrollment unverified: Potential charter option; enrollment requirements have not been verified.
Private · tuition: Potential private option; tuition and admission requirements have not been verified.
Los Angeles Unified
- Schools in district
- 785
- Rank in district
- #720 of 769
- District spending per student
- $22,687NCES F-33 · FY 2023 · This annual source is three years behind the current year.
- District child poverty rate
- 18.9%Census SAIPE · 2024
William Tell Aggeler Opportunity High is listed in Los Angeles Unified; a district label does not verify attendance for an address.
About William Tell Aggeler Opportunity High
William Tell Aggeler Opportunity High is a public high school in Chatsworth, CA, part of Los Angeles Unified, serving approximately 68 students in grades 7th-12th with a 17:1 student-teacher ratio. It holds a MySchoolScout rating of 4.8 out of 10 and ranks #7,568 of 9,539 schools in CA. State assessment records show 5% math proficiency (multi-year average, 2009-2024) and 6% reading/ELA proficiency (multi-year average, 2009-2024).
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.
School factsNCES Common Core of Data (CCD) (SY 2023–24)
- Grades
- 7th – 12th
- Enrollment
- 68
- Student-Teacher Ratio
- 17:1
- Teachers (FTE)
- 4
- Type
- alternative
- Setting
- Large City
- County
- Los Angeles County
- Phone
- (818) 341-1232
- 4-Year Graduation
- ≤10%
- Area population (ZIP 91311)
- 40,557
- Area average commute
- 29.1 min
- Area median age
- 42.3
About this school's data
Every number on this page comes from a published source with a stated period. Where a source is partial, aging, or describes a surrounding area rather than the school, that limitation is named below.
- School directory (enrollment, grades, staff, contact)
- NCES Common Core of Data (CCD) · SY 2023–24 · Medium confidence
- Source period: SY 2023–24. A newer release may be available.
- MySchoolScout rating and rank
- MySchoolScout ranking model · Low confidence
- Vintage not available. Do not use this measure alone.
- Derived as a weighted blend of the component scores shown in Academics from state assessment, EdFacts growth, and NCES resource records.
- Math proficiency
- State department of education · 2024 CAASPP · Medium confidence
- Available for part of the eligible units; results may not represent the full area.
- Source period: 2024 CAASPP. A newer release may be available.
- Derived from source records rather than read directly from one field.
- Reading/ELA proficiency
- State department of education · 2024 CAASPP · Medium confidence
- Available for part of the eligible units; results may not represent the full area.
- Source period: 2024 CAASPP. A newer release may be available.
- Derived from source records rather than read directly from one field.
- Student progress (growth)
- NCES EdFacts · Mixed source periods · Low confidence
- Vintage not available. Do not use this measure alone.
- Available for part of the eligible units; results may not represent the full area.
- Derived as the fitted year-over-year slope of proficiency from multi-year assessment records.
- Neighborhood (income, housing, education)
- U.S. Census ACS 5-year estimates · ACS 2019–2023 5-year estimates · Low confidence
- Older source: ACS 2019–2023 5-year estimates. Use as historical context.
- Reported for the ZCTA for ZIP 91311; this does not measure the attendance area.
- Programs (AP/IB, athletics, gifted)
- CRDC via Urban Institute · SY 2021–22 · Medium confidence
- Available for part of the eligible units; results may not represent the full area.
- Source period: SY 2021–22. A newer release may be available.
Evidence periods: Rating mixed/unknown input periods; assessments multi-year average, 2009-2024; directory SY 2023–24
Related reading
- Best Elementary Schools in America: 2026 Rankingsbest schools
- Best Public Schools in California 2026: Top-Ranked Elementary, Middle & High Schoolsbest schools
- Best School Districts to Move To in 2026: A Data-Driven Guidebest schools
- Best Schools in Los Angeles, CA — 2026 Rankingsbest schools
- Best Schools in San Diego, CA — 2026 Rankingsbest schools
Get school insights in your inbox
New rankings, best-schools lists, and parent guides — delivered free. No spam, unsubscribe anytime.
We respect your privacy. Unsubscribe at any time.