What are staffing rules on bathing?

There are actually written guidelines and rules for bathing care in a facility.
Look up OSHA rules. I briefly looked these rules over, but did not see mentioned ratio of staff to patient for bathing safety.

Gladimhere is correct, safety would depend on many factors, vary according to the needs of the patient, and be required to be written in the care plan.

It depends, I am sure, and must appear in mom's care plan.

My mom always had just one person but I’m not sure about the rules. Why not ask the facility what their rule is. You might feel better after you discuss it with them.

Safety first rule.