The Service Employees International Union, Local 99, represents 33,000 of the lowest-paid employees in the nation's second-largest district, including custodians, teaching assistants, security aides and cafeteria workers. Some made $8 an hour last year.
The union hailed both the local and broader impact.
"This historic agreement sets a new standard for ending poverty in our schools," said Local 99 Executive Director Courtni Pugh. "This will be felt in school districts across Los Angeles and across the country."