College of San Mateo is affiliated with the California Community College Honor Scholarship Society, Alpha Gamma Sigma; the local chapter is the Eta Chapter. Alpha Gamma Sigma maintains academic standards for induction, continued membership and permanent membership.
Membership during a semester in AGS is based upon the student's GPA as of the previous semester at CSM or elsewhere. New members must have completed a minimum of 12 graded college units and achieved a semester GPA of 3.30 or higher to be invited to join the local chapter. Continuing members must maintain a cumulative GPA of 3.00 or higher. There is no unit requirement for continuing membership.
There are two avenues to permanent membership:
- a 3.25 cumulative GPA, 60 units and two semesters of local chapter membership; or
- a 3.50 cumulative GPA, 60 units and at least one semester of local chapter membership.