When the number of applications received by a CSU campus from qualified applicants is greater than the number of available spaces, a campus is considered “impacted” for undergraduate degree programs or for undergraduate students who apply from outside the local admission area.
In this case, an impacted campus is allowed to use additional criteria to screen applications.
Campuses without the impaction designation at the program or campus level are open to all CSU eligible applicants.
If you're an upper-division transfer student to the CSU, you can use this database to find out whether a degree program or campus you're interested in is affected by impaction.