16 Pa. Stat. § 12024
Where any cause of action upon a contract or otherwise arises against two or more counties by reason of their participation in the operation of a joint-county department of health, the venue of a suit in which all the participating counties are joined as defendants shall lie in any of such counties. The sheriff of the county in which the suit is instituted shall deputize the sheriffs of the other participating counties against which the suit is brought to make service upon such other counties.
When any county participating in a joint-county department of health pays all or part of any judgments and costs recovered against it singly or jointly with any other counties by reason of its or their participation in the operation of a joint-county department of health, such county shall be reimbursed out of the fund of the joint-county department of health.
16 P.S. § 12024