73 Pa.C.S. § 6141 – State and county highways and consent required

(a) General rule.— A township may construct a sanitary sewer and drain in or under any State or county highway within the township boundaries.
(b) Consent.—
1. (1) For the construction of a sanitary sewer in or under a county highway, the consent of the county commissioners of the county shall be obtained.
2. (2) For the construction of a sanitary sewer in or under a State highway, the consent of the Department of Transportation shall be obtained.