Amends GS 136-27.1 (Relocation of water and sewer lines of municipalities and nonprofit water or sewer corporations or associations) to make the existing statutory provisions applicable to water and sewer lines owned by municipalities with a population of 10,000 (was, 5,500) or less. Amends the statute to add that a municipality with a population greater than 10,000 must pay a percentage of the nonbetterment cost for relocation of water and sewer lines, owned by the municipality and located within the existing state transportation project right‑of‑way, necessary to be relocated for a state transportation improvement project. Sets out the percentage that must be paid according to the municipality's population, with the Department of Transportation paying the remaining costs.