Contra Costa County mail-in ballots for the June 3 primary will be delivered with one first-class 49-cent stamp, according to County Clerk-Recorder-Registrar Joe Canciamilla.

Several voters have expressed concern that the ballot requires additional postage due to its weight. But Canciamilla said the county has an arrangement with the U.S. Postal Service to deliver ballots that have at least one "Forever" stamp attached. Postal clerks reportedly have advised some voters that the ballots need as much as 70 cents postage.

"We've been getting ballots in now for three weeks and we check with the post office on an almost daily basis to do a postal check," Canciamilla said Saturday. "No ballot will get delayed, no ballot will not get delivered because of postage."

Lisa P. White covers Concord and Pleasant Hill. Contact her at 925-943-8011. Follow her at Twitter.com/lisa_p_white.