Pleasant Hill falls entirely within Mt. Diablo Unified School District (MDUSD). The PH portion of the district includes 5 elementary schools, 2 middle schools, and College Park High — a tighter and generally higher-performing subset than MDUSD as a whole.
Pleasant Hill's MDUSD elementaries (Strandwood, Sequoia, Pleasant Hill Elementary, Fair Oaks, Valle Verde) all rank above district average, with Strandwood consistently top-5 in MDUSD.
Middle school is Pleasant Hill Middle or Valley View Middle depending on address; high school is almost always College Park (a few addresses edge into Ygnacio Valley or Northgate).
The practical upshot: buying anywhere in Pleasant Hill usually gets you a solid MDUSD assignment end-to-end. The specific elementary feeder is where home prices differentiate.