Grantsville WWTP - Secondary Treatment Plant in Grantsville, Maryland

Grantsville WWTP is a municipal wastewater treatment facility located in Grantsville, Garrett County, Maryland. The plant serves a population of approximately 1,175 residents and operates under the regulatory framework of the U.S. Clean Water Act, which requires secondary treatment for municipal discharges. The plant provides secondary treatment, a standard level for small communities in the United States. With a designed capacity of 2,271.24 cubic meters per day and an average daily discharge of 537.53 cubic meters, the facility operates well below its capacity, indicating room for future growth or seasonal variations. The treated effluent is discharged into the Casselman River, a tributary of the Youghiogheny River, which flows into the Monongahela River and ultimately the Ohio River and Mississippi River system. This watershed supports diverse aquatic life and provides recreational opportunities in the Appalachian region.

The plant discharges into the Casselman River, which flows into the Youghiogheny River, part of the larger Ohio River basin. This watershed supports coldwater fisheries and is ecologically sensitive due to its headwater status in the Appalachian Mountains. Downstream environments benefit from the plant's secondary treatment, which reduces organic pollutants and protects aquatic habitats.