William S. Hart Union High, CA

Original Research by School Decision on William S. Hart Union High

William S. Hart Union High School District serves grades seven through twelve across the Santa Clarita region of Los Angeles County, operating from its heart in Santa Clarita with notable reach into Castaic, Stevenson Ranch, and surrounding communities. The district enrolls a substantial student population distributed fairly evenly across the middle and high school grades.

The student body is predominantly Hispanic, with a sizable Asian population and meaningful representation of white students as well. Black students, Native Hawaiian or Pacific Islander students, and American Indian or Alaska Native students each make up smaller shares. No free-or-reduced-price lunch data was available, nor were counts of students with individualized education plans or English learners, which limits a full picture of economic need and support services.

In the most recent testing year, proficiency results are mixed. English language arts performance is solid, with students across tested grades meeting or approaching proficiency at rates above the midpoint. Mathematics proficiency sits below fifty percent across the tested grade levels, and science proficiency similarly rests near that threshold. When averaged across subjects and grades, the district's overall proficiency index places it in the top quartile among Los Angeles County's districts, a meaningful strength that reflects the weight of ELA results pulling upward. Chronic absenteeism in the district runs low, also ranking in the top quartile countywide, suggesting strong engagement and attendance patterns.

The housing market serving the district spans a wide range. Newer suburban communities like Stevenson Ranch command higher valuations, while Castaic and areas toward Lake Hughes are considerably more affordable. Rents are moderate for Los Angeles County standards, and the rent-to-income ratio suggests rental affordability is relatively favorable compared to purchase affordability, which requires a substantial income. The district's per-pupil spending sits in the lower range compared to other county districts, a characteristic that may warrant attention from families concerned with resource intensity.

The district operates multiple junior and senior high schools as well as alternative and continuation programs. Hart High, the flagship school, recently transitioned its mascot from a historical Native American symbol to the Hawks, a change that took effect in the 2024-25 school year following a board decision in 2021. For families in the Castaic area, attendance boundaries work differently than for the rest of the district; Castaic residents assigned through inter-district transfer feed to Castaic High School upon entering ninth grade, except where a sibling already attends Valencia or West Ranch, creating a distinct pathway that differs from automatic feeder patterns elsewhere in the district.

The district's major facilities bond, Measure SA, has been fully expended as of 2024, and the oversight committee has been dissolved. This means the dedicated revenue stream for school construction and modernization that was in place has run its course, and no new successful bond measure has been reported, which could be relevant for families assessing the district's capacity for future facility investment and modernization.

No graduation rate data was available for the district, a gap that reflects either missing reporting or the nature of the district's data submission. State testing data covers only grades seven and eight for some subjects, another boundary set by California's testing structure rather than the district's scope.

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District Context

Officially reported figures, 2024-25.

Enrollment

20,685

Grades

KG–12

Schools

Student body

Hispanic 45%

Black 4%

White 32%

Asian 14%

Two+ 4%

Am. Indian / AK Native 0%

Hawaiian / Pac. Isl. 0%

By economic status

Percent proficient by grade, as reported

Economically disadvantaged

Not disadvantaged

ELA

Gr ALL

55%

—

Gr 7

52%

76%

Gr 8

50%

73%

Gr 11

63%

—

Math

Gr ALL

33%

—

Gr 7

37%

63%

Gr 8

32%

58%

Gr 11

29%

—

Science

Gr ALL

31%

—

Gr 8

31%

55%

Gr 11

34%

—

Gr 12

15%

—

Gr HS

32%

—

Gr UG_SEC

34%

—

Schools in this District

16 schools are officially reported under this district.

Valencia High

La Mesa Junior High

Arroyo Seco Junior High

Bowman (Jereann) High (Continuation)

Canyon High

William S. Hart High

Placerita Junior High

Saugus High

Sierra Vista Junior High

Learning Post Academy (Alternative)

Academy of the Canyons

Golden Valley High

Rancho Pico Junior High

West Ranch High

Rio Norte Junior High

Castaic High

Academic Performance

Percent of students meeting or exceeding state standards, by grade.

Mathematics

2 grades reported

54%

Grade 7

49%

Grade 8

English Language Arts

2 grades reported

68%

Grade 7

65%

Grade 8

Science

1 grade reported

47%

Grade 8

Social Studies

1 grade reported

68%

Grade 8

Housing & Real Estate

Data as of April 2026 | District-weighted from constituent ZIP codes

Home Values

Typical home value$845,453

Year-over-year change-1.8%

Range across 12 ZIP codes$426K to $971K

vs. state typical1.09x

vs. national typical2.30x

Home value trend (12 months)

ZIP code home values (12 ZIP codes)

ZIP	City	Value	YoY	Weight
91384	Castaic	$806K	-1.9%	30.0%
91390	Santa Clarita	$928K	-1.2%	23.2%
91387	Santa Clarita	$813K	-2.1%	12.7%
91381	Stevenson Ranch	$971K	-2.5%	11.2%
91321	Santa Clarita	$700K	-2.6%	6.2%
91350	Santa Clarita	$819K	-1.7%	4.5%
91355	Santa Clarita	$794K	-0.8%	3.8%
91351	Santa Clarita	$721K	-1.5%	2.5%
91354	Santa Clarita	$847K	-2.3%	2.1%
91311	Los Angeles	$946K	-1.9%	1.9%
91342	Los Angeles	$810K	+0.0%	0.9%
93532	Lake Hughes	$426K	-0.4%	0.9%

Rental Market

Typical monthly rent$2,859/mo

Year-over-year change+2.8%

Range across 8 ZIP codes$2,508 to $3,164/mo

Rent trend (12 months)

ZIP code rents (8 ZIP codes)

ZIP	City	Rent/mo	YoY	Weight
91387	Santa Clarita	$2,759	+4.6%	12.7%
91381	Stevenson Ranch	$3,114	+1.8%	11.2%
91321	Santa Clarita	$2,508	+0.8%	6.2%
91355	Santa Clarita	$2,861	+2.6%	3.8%
91351	Santa Clarita	$2,942	+2.4%	2.5%
91354	Santa Clarita	$3,164	+3.2%	2.1%
91311	Los Angeles	$2,780	+3.0%	1.9%
91342	Los Angeles	$2,713	+2.4%	0.9%

Affordability

Est. monthly mortgage (20% down at 6.48%)$4,266/mo

Home price / national median income10.1x

Annual rent / national median income41.0%

Est. mortgage exceeds rent by$1,407/mo

Comparison

State typical home value$776,233 (-1.1% YoY)

National typical home value$368,198 (+0.6% YoY)

State ZHVI trend (12 months)

National ZHVI trend (12 months)

Economic Context

30-year fixed mortgage rate6.48%

National unemployment rate4.3%

National median household income$83,730

CPI: Rent of shelter (index)447.05

30-year fixed mortgage rate (12 months)

National unemployment rate (12 months)

National median household income (12 months)

CPI: Rent of shelter (index) (12 months)

Sources: Zillow Home Value Index and Zillow Observed Rent Index (Zillow Group), Realtor.com via Federal Reserve Bank of St. Louis (FRED)

Data Currently Unavailable

Civil Rights Data (CRDC)

This profile is derived exclusively from publicly available federal and state datasets. It may not reflect the most current information available. We encourage parents and families to supplement this data with information published directly on the school’s website, which may include more recent figures, additional programs, or updated enrollment data.