It depends on your Local Union. Contract runs July 15th of every year and raises last year = 2.5%. This was eaten up by the rising cost of Medical Insurance. Although, the Medical Insurance is cheaper for a family than the private sector.
Every now and again
Answered - Math Tutor (Former Employee) - Chicago, IL
Once every 3 years
Answered - Department Administrator (Former Employee) - Chicago, IL
At the start of a new contract
Answered - Training Specialist (Current Employee) - Chicago, IL
Answered - College Clerical Assistant II (Current Employee) - Chicago, IL