Very Good
#2409 of 9,539 schools in CA
Top 25% in state
Arroyo Seco Junior High
Middle School · William S. Hart Union High · Valencia, CA
A William S. Hart Union High middle school where students score 6 points below what's typical for similar communities.
27171 North Vista Delgado Dr., Valencia, CA 91354
- Math 53% vs CA 34% (2024)
- Reading 66% vs CA 47% (2024)
- 24.3:1 student-teacher ratio
Academics
Full Profile · 3/3 metricsView breakdown
View breakdown
View breakdown
Students at Arroyo Seco Junior High score 60% proficient, which is below what's typical for similar communities (expected: 66%).
2024 CAASPP proficiency
Most recent published year. School vs. CA average.
Trend
→ SteadyProficiency is down 6 points across the 16-year record (2009–2024) and has held near 60% recently.
Show all 12 years
Multi-year averages used by the rating model: math 56% (multi-year average, 2009-2024) · reading/ELA 69% (multi-year average, 2009-2024)
Based on 28 test records from CA state assessments and EdFacts (NCES).
Equity & diversity
Shown separately, not included in the overall scoreFree/reduced lunch
15.5%
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 Arroyo Seco Junior 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 34Car-Dependent
- Bike 30Somewhat Bikeable
- 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
$148,818
Median home value
$803,000
Median rent
$2,923/mo
College educated
53.9%
Homeownership
77.7%
Poverty rate
5.1%
ACS 2019–2023 5-year estimates for the ZCTA associated with school ZIP 91354; this is area context, not an attendance boundary.
Compare nearby
Nearby same-level schools
4 from a 5-mile search; district fallback available
| School | Score | Grades | Distance | Enrollment | Compare |
|---|---|---|---|---|---|
| Legacy Christian AcademyPrivate · tuition | 6.2private | K–9 | 1.5 mi | 435 | Compare → |
| Rio Norte Junior HighEnrollment path unverified | 6.3 | 7–8 | 1.8 mi | 1,110 | Compare → |
| Placerita Junior HighEnrollment path unverified | 7.3 | 7–8 | 3.7 mi | 920 | Compare → |
| La Mesa Junior HighEnrollment path unverified | 5.4 | 7–8 | 3.9 mi | 1,023 | Compare → |
Distance is proximity only; it is not attendance eligibility.
Private · tuition: Potential private option; tuition and admission requirements have not been verified.
Enrollment path unverified: Potential public school; its attendance or application path has not been classified.
Public and private scores come from different models and are shown side by side, not blended into one ranking.
William S. Hart Union High
- Schools in district
- 16
- Rank in district
- #5 of 16
- District spending per student
- $15,278NCES F-33 · FY 2023 · This annual source is three years behind the current year.
- District child poverty rate
- 7.2%Census SAIPE · 2024
Arroyo Seco Junior High is listed in William S. Hart Union High; a district label does not verify attendance for an address.
About Arroyo Seco Junior High
Arroyo Seco Junior High is a public middle school in Valencia, CA, part of William S. Hart Union High, serving approximately 1,240 students in grades 7th-8th with a 24.3:1 student-teacher ratio. It holds a MySchoolScout rating of 7.6 out of 10 and ranks #2,409 of 9,539 schools in CA.
State assessment records show 56% math proficiency (multi-year average, 2009-2024) and 69% reading/ELA proficiency (multi-year average, 2009-2024).
Frequently asked questions
Common questions about Arroyo Seco Junior High
What grades does Arroyo Seco Junior High serve?
Arroyo Seco Junior High serves students in grades 7th through 8th.
How many students attend Arroyo Seco Junior High?
Arroyo Seco Junior High has an enrollment of approximately 1,240 students.
What is the student-teacher ratio at Arroyo Seco Junior High?
The student-teacher ratio at Arroyo Seco Junior High is 24.3:1. A lower ratio generally means more individual attention per student. The national average is approximately 16:1 for public schools.
How does Arroyo Seco Junior High rank in CA?
Arroyo Seco Junior High ranks #2,409 of 9,539 schools in CA.
What is Arroyo Seco Junior High's MySchoolScout rating?
Arroyo Seco Junior High has a current MySchoolScout rating of 7.6 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 Arroyo Seco Junior High?
Based on loaded state assessment records, Arroyo Seco Junior High has 56% math proficiency (multi-year average, 2009-2024) and 69% reading/ELA proficiency (multi-year average, 2009-2024).
Is Arroyo Seco Junior High a charter school?
No, Arroyo Seco Junior High is not a charter school. It is a traditional public school operated by the local school district.
Is Arroyo Seco Junior High a Title I school?
No, Arroyo Seco Junior High is not currently a Title I school.
What does the Free & Reduced Lunch percentage mean for Arroyo Seco Junior High?
15.5% of students at Arroyo Seco Junior 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 – 8th
- Enrollment
- 1,240
- Student-Teacher Ratio
- 24.3:1
- Teachers (FTE)
- 51
- Type
- regular
- Setting
- Large Suburb
- County
- Los Angeles County
- Chronic Absenteeism (SY 2022-23)
- 12.7%
- Phone
- (661) 296-0991
- Area population (ZIP 91354)
- 33,059
- Area average commute
- 34.7 min
- Area median age
- 39.6
Official sources & links
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 91354; this does not measure the attendance area.
Evidence periods: Rating mixed/unknown input periods; assessments multi-year average, 2009-2024; directory SY 2023–24
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