Reporting an accident
File an SR-1 with DMV within 10 days if anyone is injured or killed or property damage exceeds $1000; it is required in addition to any police CHP or insurance report. [dmv.ca.gov]
Accident Report Copy
LASD releases traffic collision reports to involved parties; request a copy through the local sheriff station or the Records and Identification Bureau. [lasd.org]
Parking
Parking is prohibited during posted street-sweeping periods on designated city streets; exceptions include avoiding traffic conflicts and obeying an officer or traffic-control device. [library.municode.com]
Impounds: finding & releasing your car
Lancaster Sheriff Station serves the city at 501 W. Lancaster Blvd.; call 661-948-8466 about a vehicle stored or impounded by a deputy. [lasd.org]
Who to call
Lancaster Sheriff Station's 24-hour business and non-emergency line is 661-948-8466. [lasd.org]
Private-property towing
California private-property towing generally requires a sign at least 17 by 22 inches at every entrance and written authorization from the owner or lessee; local traffic law enforcement must be notified within one hour after authorization. [leginfo.legislature.ca.gov]
This guide summarizes official sources linked above. Rules change - always confirm with the linked agency. This is general information, not legal advice.