Which state is that? Most students need at least a B average for admission to even the lowest rated schools in the California State University system, like CSU East Bay or CSU Dominguez Hills.
time could have changed, but a decade ago local high schools in my CSU were guaranteed entrance with a 2.0 and a 1200 SAT score... in the days where we still had the 2400 system. So I suppose that would be 800-900 in the 1600 point system.
But this is 12-14 years out of date. Maybe standards rose or they couldn't continue this guarantee.
Times have changed a bit. Some CSU campuses do guarantee admission based on GPA but only to students who graduate from high school in a limited set of local public school districts. Like CSU East Bay requires a 2.5 GPA from one of two school districts (SAT scores don't count). Other campuses like SJSU have no guaranteed admissions but do give preference to locals.