Antietam WWTP, Sharpsburg, Maryland - Secondary Treatment Plant

Antietam WWTP is a municipal wastewater treatment facility located in Sharpsburg, Washington County, Maryland, United States. It serves a small population of approximately 1,373 residents, reflecting its role in a rural community near the Potomac River. The plant provides secondary treatment, which is the standard level required by the U.S. Clean Water Act for municipal wastewater. With a designed capacity of 605.66 million gallons per year and a discharge volume of 605.67 million gallons, the facility operates near full capacity. Under the National Pollutant Discharge Elimination System (NPDES), plants of this scale must meet effluent limits to protect water quality. Treated effluent from Antietam WWTP flows into the Potomac River, a major tributary of the Chesapeake Bay. The Chesapeake Bay watershed is ecologically significant, supporting diverse aquatic life and serving as a critical habitat for migratory fish and waterfowl. Nutrient removal from wastewater is important to reduce impacts on the bay's ecosystem.

The plant discharges into the Potomac River, which flows into the Chesapeake Bay, the largest estuary in the United States. The Chesapeake Bay supports a complex ecosystem including blue crabs, oysters, and striped bass. Nutrient loading from wastewater can contribute to algal blooms and hypoxia, making effective treatment essential for downstream water quality.