North County residents in the Fallbrook Public Utilities and Rainbow Municipal Water districts will soon vote on the controversial separation of the two utility agencies from the San Diego County Water Authority.

Registered voters in the rural communities will be able to cast a ballot to approve the long-planned detachment from the region’s biggest water seller in a special election on Nov. 7.

It will be one of three happening across the county next week, including the elections to fill vacant seats on the San Diego County Board of Supervisors and in Chula Vista.