About 180 workers at the York Region Children's Aid Society walked off the job early Monday in a dispute over workloads and wages.

They began picketing at 6 a.m. ET after rejecting management's latest offer last Thursday and talks collapsed on Friday, the Ontario Public Service Employees Union said.

Erin Kinsley, vice-president of OPSEU Local 304, said employees decided to "take a stand" and go on strike to fight "chronic workload problems" reported over the years.

Kinsley also said the union is optimistic talks can resume.

More than 400 children could be affected by the walkout, as well as 1,000 open family case files in the region north of Toronto.

However, the Children's Aid Society has said it has a backup plan to ensure children and families are cared for during a walkout.

Officials said essential child protection services will be provided by "extremely well-trained" non-union branch managers.

With files from the Canadian Press