Pa. Code Title 28 § 27.60 (A)

Authority. The Department or local health authority shall direct isolation of a person or an animal with a communicable disease or infection; surveillance, segregation, quarantine or modified quarantine of contacts of a person or an animal with a communicable disease or infection; and any other disease control measure the Department or the local health authority considers to be appropriate for the surveillance of disease, when the disease control measure is necessary to protect the public from the spread of infectious agents.

The Department or local health authority shall ensure that instructions are given to the case or persons responsible for the care of the case and to members of the household or appropriate living quarters, defining the area within which the case is to be isolated and identifying the measures to be taken to prevent the spread of disease.

Pa. Code Title 28 § 27.65 1-2

Police Power & Limitations. If the disease is one which the Department, or a local health authority which is also an LMRO, determines to require the quarantine of contacts in addition to isolation of the case, the Department or local health officer of the LMRO shall determine which contacts shall be quarantined, specify the place to which they shall be quarantined, and issue appropriate instructions.