Public Resources Code § 8858
CHAPTER 3. Geodetic Datums and the California Spatial Reference Network
The geodetic control stations within the State of California having orthometric heights determined by GPS survey methods and conforming to all of the following requirements shall be part of the CSRN. The orthometric heights shall:
(a) Be based on NAD83 and referenced to NAVD88, or alternatively, NATRF2022 and NAPGD2022.
(b) Be published by NGS or CSRC.
(c) Have a NGS or CSRC published network accuracy of five centimeters or better as defined by FGDC.