Monterey County is the only county is California with a law that prohibits private companies from operating new desalination plants. That law, passed in 1989, will be up for a potential repeal when the county’s supervisors meet on Sept. 21.

The law has been thrust into the spotlight as Algonquin Power and Utilities Corp., a publicly traded, $11 billion Canada-based company, has proposed construction of what could be a massive regional desalination plant in Moss Landing.