53 Pa. Stat. § 53402
All municipal assessments for grading, paving, curbing, macadamizing, or otherwise improving public highways, or parts thereof, as aforesaid, shall be filed with the clerk or secretary of the incorporated town, who shall thereupon cause thirty days written or printed notice to be given each party assessed, either by service on the owner or agent, or left on the assessed premises, that the assessments are due and payable. If said assessments, or any of them, shall remain unpaid at the expiration of said notice, the same shall be placed in the hands of the solicitor of said town for collection, whose duty it shall be to collect the same, together with five per centum additional as attorney's commission, and interest from the completion of the grading, paying, curbing, macadamizing, or other improvements, by a municipal claim filed against the delinquent owner, describing the premises, upon which a scire facias may issue. When an owner has two or more lots against which there is an assessment for the same improvement, all of said lots shall be embraced in one claim.
53 P.S. § 53402