Truant elementary students cost North Coast school districts more than $20 million, according to a state attorney general report that said 1 million statewide elementary students missed class last school year.
Nearly a quarter of Lake County elementary students skipped school last year, the report found, costing districts $416 per pupil — one of the highest rates in the state.
Sonoma County's truancy rate is 12 percent — one of the lowest in the state. But the 5,000 truant students cost county schools $14 million last year, according to the report released Monday.
"We need to confront the behavior early on," said Sonoma County schools superintendent Steven Herrington. "If we don't confront the behavior early, then we will have a bigger problem later."
With a 14 percent truancy rate, Mendocino county schools lost $4 million in state education funds, which are distributed based on attendance.
Napa's 6 percent truancy rate — the third lowest in the state — cost schools $3.8 million.
Studies indicate that chronically truant students — those that miss at least 10 percent of the school year — are more likely to drop out of high school and to end up jobless or turn to crime, the report said.
"Factoring in the costs of incarceration and lost economic productivity and tax revenues, dropouts cost California an estimated $46.4 billion per year," the report said.
California schools lost $1.4 billion in state funding due to truancy, the report found.
State law, which requires children ages 6 to 18 to attend school, defines truants as those who are absent or tardy more than 30 minutes without a valid excuse three times in a school year.