PSEA represents the labor, policy, and professional interests of its members.

PSEA bargains compensation and benefits, protects members’ rights, and advocates for their professions.

PSEA contracts also cover some non-members, known as agency fee payers, which since 2005 have numbered comparatively about 3% of the size of the union's membership.

[2] As of 2014 this accounts for 27,809 "retirees" (15% of total), 7,902 "students" (4%), 816 "reserve," and 552 "substitutes/associates" (both <1%), plus 5,662 non-members paying agency fees, compared to 142,406 "active" members.

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