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

The vote was 94 percent negative and 87 percent of the nurses balloted, according to Erin Bowie, a staff representative from the Communication Workers of America.

CWA Local 1133 represents about 270 nurses at the hospital.

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