Members of the public service union Unison working at Kettering, Corby, Wellingborough and East Northamptonshire councils are to begin preparations for a strike ballot over pay.
Unison says its members have been told they will not receive a pay offer until May 1.
Tonia Williams, Unison spokesman for Northamptonshire, said: “When you think about the minimum wage, you think of young workers, just starting off in life in their first jobs being provided with a basic minimum.
“It’s a sad fact but now that same minimum wage will soon apply to the people who help to look after the most vulnerable people in our society, who look after our children and keep our streets clean and safe.
To cap it all some of these same dedicated workers are even having to use food banks because their families can’t afford to make ends meet.”
No further details about the potential dates of the strike have yet been released.
A spokesman for Unison said the union is at the early stages of preparation for the ballot, which affects other district councils in the county.