Each State shall establish or designate one or more State or local authorities which shall establish, maintain, and insure the enforcement of standards for any category of institutions, foster homes, or group living arrangements in which (as determined by the State) a significant number of recipients of supplemental security income benefits is residing or is likely to reside. Such standards shall be appropriate to the needs of such recipients and the character of the facilities involved, and shall govern such matters as admission policies, safety, sanitation, and protection of civil rights.