is reporting every car accident to dmv always necessary? how is it reported to dmv?

You can use the website to make a report

You need to report every accident the DMV if it's more than $500 damage. You need to do it within 5 days to just go to the front of the line fill up a form

Only if it's a big accident

I believe if the damages is over $700 and no police was not involved you have to reported