Here's the actual law from section 730, Title 14, California Code of Regulations:
730. Camping Near or Occupying Wildlife Watering Places.
(a) Camping/Occupying Defined. For purposes of this Section, camping/occupying is defined as establishing or inhabiting a camp; resting; picnicking; sleeping; parking or inhabiting any motor vehicle or trailer;
hunting; or engaging in any other recreational activity for a period of more than thirty (30) minutes at a given location.
(b) Wildlife Watering Places Defined. For purposes of this Section, wildlife watering places are defined as waterholes, springs, seeps and man-made watering devices for wildlife such as guzzlers (self-filling, in-the-ground
water storage tanks), horizontal wells and small impoundments of less than one surface acre in size.
(c) Prohibitions.
(1) Camping/Occupying is prohibited within 200 yards of the following:
(A) Any guzzler or horizontal well for wildlife on public land within the State of California.
(B) Any of the wildlife watering places on public land within the boundary of the California Desert Conservation Area as depicted on the Bureau of Land Management maps of “Calif. Federal Public Lands Responsibility,” “Calif. Desert Conservation Area” and the new “Desert District, B.L.M.”