Among the schools involved are California High School in San Ramon and Monte Vista High School in Danville.
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Parents of Monte Vista High School students attended an emotional meeting after racist graffiti was discovered in a boy's bathroom there Wednesday.
The principal addressed the parents.
"What we are hearing are only symptoms of what is going on in the larger society," the school's principal said.
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At Monte Vista High School, parents spoke frankly about race.
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"I understand your children don't experience the same things, but there are kids afraid and it's not just graffiti," said Lelane Shephard, a parent.
There have been four racist vandalism incidents in the San Ramon Valley Unified School district in just one month. Three others at Cal High. The most recent, which looked similar to Monte Vista's graffiti, was found Thursday.
"All four are ugly and harmful incidents," said Elizabeth Graswich of the San Ramon Valley Unified School District.
RELATED: Racist graffiti found at Monte Vista High School in Danville
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Some parents here were shocked such a thing was happening at the schools. While others insist it's been going on for far too long.
"There is no empathy for other voices in this community," Shephard said.
But student voices were heard loud and clear Thursday morning. At an impromptu assembly, more than 100 students spoke, denouncing these acts.
Monte Vista's principal re-affirmed that whoever is responsible, could face suspension and possible expulsion.