A spokeswoman for the Engineering, Print and Manufacturing Union said their average contract settlement so far this year was a 2.4 per cent increase.
"That's going to be higher than the average for workers because those is unions are much more likely to get a rise. The statistics for last year showed that about half of workers didn't get a payrise at all," she said.
The salaries for general councillors and the mayor were set by the independent Remuneration Authority using a formula which took into account councillor job size, the area's population and council expenditure. Councils were then invited to make representation for additional remuneration for committee chairs and the deputy mayor.
The mayor said this year's pay rises happened automatically - as opposed to past years where they had required a council resolution to come into effect.
"I can imagine how people will perceive this - we've increased rates and got a pay rise," Ms Mai said. "We go through this every year [with the Authority]. Asking, why are you putting us in this situation?"
She said if council as a whole had the opportunity to turn down the rise she had no doubt it would do so, but it was now up to each individual councillor to decide what they wanted to do with the extra money.
The mayor had not decided yet what she would do. "Until it comes through you don't really know what that extra amount in the pay packet is. I will continue to work hard for it."
Authority deputy chair Angela Foulkes said councils were advised of their pay rates for the coming financial year in April.
Councils were not able to reject outright the pay rate set by the authority. This was meant to stop councils paying themselves an inappropriate amount and using pay rates as a political football. Councillors could though donate their rise to another cause.