Twelve test claimants including cooks, cleaners and care assistants submitted claims to an employment tribunal against Sunderland City Council.
It related to productivity bonuses paid to male employees in male-dominated jobs like gardeners and road sweepers, which were not paid to the women.
Paul Doran, from Stefan Cross Solicitors which represented the women, told the BBC the judgement would affect about 150 women.
He said he believed the compensation could be up to£30,000 for individuals.
The council said it was considering the detail of the tribunal's 87-page judgement.