Residents of Letterkenny Township, who do not have their own on-lot sewage disposal systems, have public sewer service provided by one of three organizations listed below. The Letterkenny Township Municipal Authority (LTMA) Sewage Treatment Plant was sold to the York Water Company in September of 2020.
Cumberland Franklin Joint Municipal Authority (CFJMA)
Hamilton Township Municipal Authority (HTMA)
The York Water Company (formerly LTMA)