Nearly 900 eighth-graders have left the Sunnyside Unified School District since 2006 to attend private or charter schools - costing the district about $3 million in state funding.
And the Tucson Unified School District - the largest in the city - has lost about 8,300 students to charters over five years - some 3 percent of its enrollment. Such losses would have cost the district an estimated $36 million in state funding, although officials say some of the students have returned.
TUSD has tried for years to find ways to stop the hemorrhaging - bulking up its niche programs, studying who's leaving for where, and advertising its extracurriculars to parents and students. Last year, the district budgeted almost $420,000 for school-choice exploration. The initiative encourages schools to transform, offering a special focus or learning model that would draw in and retain students.