OSHA does not have a “blanket” regulation that requires all signs to be provided in multi-lingual formats when there is a non-English speaking employee. No OSHA signage requirement specifically calls for signs in the language(s) the employees understand.
Signage requirements specify only that a sign is required without a language requirement, specify that the sign must be in English, or specify the exact wording in English.
However, OSHA encourages (but does not require) employers to have signs in other languages in addition to English signs. Also, the employer may wish to reinforce any training with multi-lingual sign formats. An employer should check state and local laws and may wish to consult an attorney about liability issues related to not posting signs in a language employees can understand.