Registered nurses at Kenmore Mercy Hospital, working without a contract since Feb. 1, overwhelmingly rejected a four-year offer Monday.

The vote was 94 percent negative, and 87 percent of the nurses balloted, according to Erin Bowie, a staff representative from the Communications Workers of America. CWA Local 1133 represents about 270 nurses at the hospital.

Bowie said before the vote that the union bargaining committee did not recommend the contract and that rejection would be considered an authorization to strike. She said, however, that a work stoppage would be “a last resort” and that the union would try to work with the Catholic Health System to come up with a contract nurses would approve.