According to the Los Angeles Times:
North Carolina sparked a national furor by requiring transgender people to use bathrooms corresponding to the gender on their birth certificates, citing risks to children in schools as a primary justification. California has been shifting the other way with little fanfare.
A gender-neutral bathroom law, Assembly Bill 1732, was one of many measures with an effect on education that Gov. Jerry Brown signed during the legislative session that ended Friday.
Starting next March, any one-toilet bathroom in a California school — or in any other government building, public place or business — will have to be designated as all-gender, open to anyone.