Fórsa has served formal notice of industrial action on local authority chief executives.
The union has accused local authority management of refusing to establish a job evaluation scheme for staff.
Last month, Fórsa members voted overwhelmingly in favour of industrial action, up to and including strike action.
The campaign of industrial action will begin next week, commencing with an indefinite ban on engagement on all political representations, both verbal and written, from Wednesday 21 June.
This will be followed by a telephone ban on Thursday 22 June, to include the use of work landline and mobile phones.
The campaign is set to continue, with rolling action planned over the coming weeks.
Job evaluation, which has already been established in the health and higher education sectors, is a process for measuring the relative worth of posts in an organisation based on the work a post-holder is doing or is expected to do.
Fórsa said many local authority workers continue to take on additional duties and responsibilities assigned to them during the economic crisis, when 10,000 jobs were lost from the sector.
"We have been left with no other option but to escalate our dispute, this action is a last resort," said Fórsa's Head of Local Government and Local Services Richy Carrothers.
"We have a strong mandate from our members, and this dispute isn’t going to go away by ignoring it, which is exactly what the Local Government Management Agency has attempted to do," he said.
