It's nomination day for next month's municipal election and candidates needed to submit their forms by noon in order to ensure they're on the ballot.

Forms and a deposit were due in the city council chamber this morning and candidates were asked to make sure they have the correct number of signatures on their forms.

"You need 100 for mayor, 100 for councillor and 25 each for the school boards," said Barbara Clifford, Calgary's returning officer. "Deposit is $100 for everything but mayor, and $500 for mayor."

Mayor Naheed Nenshi and 12 current aldermen are running for re-election and all of them will face challengers.

Nenshi upset some people with his decision to endorse all current members of council, with several candidates saying that's for voters to decide.

Some previous council members were at city hall this morning, saying they want back in.

Former alderman Jon Lord is again running for mayor and former alderman Joe Connelly wants his old job back as the representative in Ward 6.

Both Connelly and Lord ran unsuccessfully for mayor in 2010.

This year, voters will notice several changes on their ballots.

Aldermen will be referred to as councillors after October's election, and their terms will extend from three to four years.

The list of candidates will be finalized Tuesday and Calgarians go to the polls Oct. 21.

Two separate school trustees were acclaimed — Linda Wellman and Cathie Williams.