The top reported proficiency rate is 46% in Social studies. The lowest is 8% in Math.
Original Research by School Decision on Black Diamond Middle
Black Diamond Middle is a public seventh-and-eighth-grade school in Antioch, part of Antioch Unified School District, serving a mid-sized enrollment for a two-grade campus. It sits in one of Contra Costa County's larger cities, a predominantly residential community anchored by the San Joaquin River waterfront and a historic downtown, with newer subdivisions spreading south and east toward the BART terminus at Hillcrest Avenue.
The student body is racially and ethnically diverse, with Hispanic and Black students together making up the majority of enrollment, a meaningful share of Asian students, and smaller proportions of white and multiracial students. A large majority of students qualify for free or reduced-price lunch, placing this squarely among California middle schools that serve communities with substantial economic need. Data on English learners and students with IEPs was not available in what was provided.
State testing results from the most recent available year paint a candid picture. Across both grade levels, the share of students meeting or exceeding state standards in English Language Arts falls in the lower fifth of the range, and in math it is well below even that. On the California Science Test, eighth-grade results are similarly low. Positioned against districts in Contra Costa County, the school's overall proficiency index sits in the bottom quartile of the sixteen comparable entities with data. These are not figures to soften. A parent looking for a school where most students are testing at grade level will not find that here, and it would be worth asking the school directly what instructional supports are in place, what intervention pathways exist for students who are behind, and how the coming budget constraints described below may affect those programs.
The comparison set does not include a graduation rate because Black Diamond is a middle school; that metric does not apply. Chronic absenteeism data was also not available.
Program offerings were not included in what was provided, so a parent interested in electives, enrichment, or any specialized pathways would want to contact the school directly.
The broader district context matters right now, and families should weigh it carefully. Antioch Unified is publicly reported to be in a serious budget crisis as of 2026, with the county downgrading the district to a negative certification, meaning the district likely cannot meet its financial obligations without changes. The district authorized a large round of preliminary layoffs earlier in 2026, spanning teachers, paraeducators who support special education students, school psychologists, and custodians. For a school serving a population with high economic need, reductions in paraeducators and counseling supports in particular are worth tracking. Separately, voters approved a district-wide school facilities bond in March 2024, a long-term property tax obligation for homeowners in the district, aimed at modernizing aging buildings across the district including roof, HVAC, and infrastructure repairs.
On the housing side, the Antioch zip code shows home values that are meaningfully below the California statewide benchmark, though still well above national norms. Values have edged down slightly year over year. Rents have moved modestly upward. For families priced out of closer-in Bay Area communities, Antioch has historically offered more accessible entry points, though a substantial share of renters citywide are reported to be cost-burdened. The city is actively adding housing through several development projects, and the BART connection at Hillcrest Avenue makes the area accessible to regional employment centers without a car for at least part of the commute.
Antioch itself offers genuine outdoor amenities, Black Diamond Mines Regional Preserve and Contra Loma Regional Park are close, the waterfront and marina are community anchors, and the Rivertown district has a walkable historic core, though most of daily life outside that pocket is car-dependent.
Black Diamond Middle is the neighborhood public option for seventh and eighth graders in this part of Antioch. The academic performance data is a real challenge the school faces, and the district's financial instability adds uncertainty to what resources will be available in the near term.
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