EDIT: I've missed that personal belief exemption is no longer allowed. Anyway, what's below shows that it WAS an issue, and quite recently. Also while kids should be vaccinated now due to the law it still tells something about ideas parents hold.

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"We require parents to follow all state laws regarding immunization" actually allows "personal belief exemptions", since it is a part of laws.

And few links from few years ago:

SF: https://www.sfwaldorf.org/uploaded/docs/gs/gs_health_and_ill...

Also "On the other side of the bay, about two-thirds of the students at the private Waldorf School in upscale Los Altos Hills didn’t have the proper immunizations." - https://www.mercurynews.com/2015/01/26/measles-outbreak-low-...

In general official Waldorf policy is that there is no policy

I wondered about this also, especially in the wake of the recent CA law that eliminated personal belief exemptions. The article linked below talks about various CA Waldorf schools, but not the SV one. Also, it specifically talks about the personal belief exemption, which isn't available anymore.

I should note that the medical exemption rate is up since this change in law, [1] perhaps owing to abuse of the medical exemption, or perhaps owing to people who have a legitimate medical need now being forced to get a doctor's note, instead of just being able to opt out based on personal belief.

1: http://www.latimes.com/science/sciencenow/la-sci-sn-vaccine-...