San Diego County elections officials have mailed out more than 430,000 notices to registered voters eligible to participate in the November special election, alerting people to the issues and how they may cast their ballots.

Voters in the 4th District of the county Board of Supervisors will choose between San Diego City Councilmember Monica Montgomery Steppe and activist Amy Reichert in the runoff election to succeed former supervisor Nathan Fletcher.

Residents of the Fallbrook Public Utilities District and Rainbow Municipal Water District will decide whether to secede from the San Diego County Water Authority, a plan that was approved by the Local Agency Formation Commission in June but is still being challenged in court.