The Antietam Valley Municipal Authority is a joint municipal authority created by the Borough of Mount Penn and Lower Alsace Township, for the purposes of owning and maintaining the sewer (or wastewater) collection and conveyance system, the pump station and the wastewater treatment plant.

These facilities are operated and maintained since 1982 by the Authority.

Antietam Valley Municipal Authority provides service to 3,863 sewer connections in Mount Penn Borough, a portion of Exeter Township, St. Lawrence Borough and the City of Reading.