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

The Ontario Public Service Employees Union says the workers rejected management's latest offer last Thursday and talks collapsed on Friday.

More than 400 children could be impacted by the walkout, as well as some 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 in place 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.