https://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=201720180SB179
(link to the text, and status here)

Hi, I live in California, and identify as non-binary- just wanted to let ya'll know that the California Senate is still on track to allow people to change their gender to "non binary" on state documents, and with the Department of Motor Vehicles.

This is really exciting news, and as written, having undergone treatment is not a requirement! Cross your fingers
-Eli