That's a compromise after Republicans filed a lawsuit seeking to stop urban voters from using those procedures. The settlement was announced in a Phoenix courtroom.
The counties have until Nov. 14 to address the issue.
The Republican lawsuit alleged that the state's county recorders don't follow a uniform standard for allowing voters to address problems with their mail-in ballots, and that Maricopa and Pima counties improperly allow the fixes for up to five days after Election Day.
Democrat Kyrsten Sinema has jumped into a slight lead over Republican Martha McSally in the midst of the slow vote count.