Brewer Island Elementary

Brewer Island Elementary, a low-enrollment elementary school in Foster City, California, part of San Mateo-Foster City, educates 306 students, covering grades K through 5. Enrollment runs roughly 34% leaner than the state mean of about 465.

San Mateo-Foster City comprises 22 schools with combined enrollment of 9,906 students; Brewer Island Elementary is among them.

On the student-mix side, Brewer Island Elementary reports that the largest single group is Asian at 50%, but no single group is in the majority. Other groups include 20% Hispanic, 14% multiracial, 13% White. That is visibly more Asian than the county at large, where the share is closer to 31%.

On the resource side, The school currently runs with 14 full-time-equivalent teachers, for a student-teacher ratio near 21.9:1. The state averages about 22.3:1, putting this campus right in line with peers. Roughly 19% of students at Brewer Island Elementary qualify for free or reduced-price lunch, often used as a Title I proxy. Set against San Mateo County (around 34%), the school's rate is south of typical.

Adjusting for the school's free-and-reduced-lunch share, Brewer Island Elementary performs roughly as the BeatsExpectations model predicts for a school with this FRL share. The predicted value is around 68.4%, the actual is 77.0%, a residual of +8.6 points.

Zooming out to the county, ACS estimates for San Mateo County put median household earnings sit near $158,855, about 54% of the adult population holds a bachelor's degree or above, and roughly 4% of residents live below the federal poverty line. In all, San Mateo County runs 176 public schools (combined enrollment of about 82,403 students), of which Brewer Island Elementary is one.

Audubon Elementary is the nearest neighboring public school, about 0.4 miles from this campus. 8 of the 8 nearest public schools sit inside a five-mile radius. Among the 8 schools in that immediate cluster with test data (this one included), Brewer Island Elementary ranks 2nd on composite proficiency, above the local average of 68.9%.

Geographically, the school is in a residential area.

Trend over the last 7 years. Brewer Island Elementary's enrollment has contracted 47% since 2018, when it stood at 573 (now 306). Over the same period, the Asian share shrank from 64% to 50%. Class-load math has tightened: from 24.9:1 in 2018 to 21.9:1 in 2025.

On allk12, the page collects discussion, questions, and updates around enrollment questions, classroom assignments, and PTA news. Members of the school community can share what they know.