16 Pa.C.S. § 12302 – Incompatible offices

(a) Legislative member, school director or board of health member.— An elected county officer or, in counties of the third, fourth, fifth, sixth, seventh and eighth class, county solicitor, if the county solicitor is an individual, may not, at the same time, serve as:
1. (1) A member of the legislative body of a municipal corporation.
2. (2) A school director of a school district.
3. (3) A member of a board of health.
(b) Treasurer or tax collector.— Except as authorized under law, an elected county officer or county solicitor, if the county solicitor is an individual, of a county of the third, fourth, fifth, sixth, seventh or eighth class may not, at the same time, serve as treasurer or tax collector of a municipal corporation.
(c) Congress or Federal office.— A member of Congress from this Commonwealth and an individual holding or exercising an office or appointment of trust or profit under the United States may not, at the same time, hold or exercise a county office in this Commonwealth to which a salary, fee or perquisites are attached. This subsection shall not apply to a member of the National Guard or other reserve component of the armed forces not called into active duty.