The nurses, who work at Providence Saint John's Health Center, have all been issued written warnings in their employment records.
MORE: Santa Monica nurses suspended for refusing COVID-19 care without N95 mask
And the hospital is now supplying N-95 masks.
The hospital maintained its medical staff had been provided protective gear under guidelines set by the CDC and the World Health Organization. Hospital officials noted that N-95 masks were subject to a national shortage..
"There is a national shortage of PPE, including N95 masks. We do not manufacture these, and are at the mercy of the supply chain to increase our supplies," the hospital said..
Now, the hospital says, it has received increased inventory and has received authorization to reprocess existing masks.
Saint John's is now providing the higher-level N-95 masks to all nurses who treat COVID-19 patients.
WATCH: From hand-washing to wearing masks, here's how to protect yourself