Can employers require employees to submit written notification/disclosure that they have a second job?

No, California is very protective of employees who engage in “lawful conduct,” and it is illegal to discriminate against employees or applicants on the basis of such conduct that they engage in during nonworking hours away from your premises. (See California Labor Code sections 96(k), 98.6).

Having a second job, or “moonlighting,” is one example of such lawful conduct. Requiring written notification as noted above could be violative of their privacy and have a chilling effect on the employee seeking a second job.

This right to have a second job does not, however, prevent an employer from having a rule