Alameda County, where the factory is located, is among several California counties - San Francisco, Santa Clara, San Mateo, Marin, Contra Costa, and Sonoma - that this week issued a shelter-in-place order to mitigate the spread of the deadly COVID-19 coronavirus.
The electric automaker had continued to operate its production line, defying a shelter-in-place order from local authorities despite a public rebuke from the Alameda County sheriff.
Tesla did not return calls for comment.
"We had a good conversation with Tesla today", said Alameda County spokesman Ray Kelly.
Tesla's decision to keep its factory in Fremont in California open has led many to question why the company is being allowed to function despite an order from Alameda County government to keep non-essential businesses shut amid coronavirus outbreak.
In another memo on Monday, Musk told employees he was not aware of any workers who had tested positive for the virus, and urged them to stay home if they felt the "slightest bit ill or even uncomfortable", people familiar with the matter told Reuters.
Elon Musk said Thursday that he will begin diverting resources from SpaceX and Tesla factories in order to build and sell respirators to hospitals in need as they continue to fight back the spreading coronavirus.
Tesla had previously instructed employees who feel unwell or have potentially been in contact with someone who has the coronavirus to alert the company and stay home, but did not extend that policy to those who were only anxious about the virus.
On Wednesday night, a Tesla attorney sent out an email that reiterated that most employees should go to work and clarified that the company had not yet laid off staff.
Workman reiterated that "essential" employees who can't work from home should continue to report to work at the factory. Its cash position at the end of the the fourth quarter was $6.3 billion before its recent $2.3 billion capital raise.
Tesla shares slipped 0.2% as of 8:15 a.m. Tuesday in NY.
Tesla has a second factory in Shanghai, China, which has reopened after a coronavirus shutdown.