Back River Wastewater Treatment Plant


On June 22, 2022, the City’s Board of Estimates approved a Consent Order and Revised Directive with the Maryland Department of the Environment (MDE). The agreement represents a clear path forward that will ensure long-term compliance and strong partnership with MES to increase capacity and expedite key projects at the Back River Wastewater Treatment Plant. The Order will end after 3 months of effluent levels within permitted levels. The City anticipates a Consent Decree with MDE that will define future involvement.

DPW releases bi-weekly updates on compliance progress at the wastewater treatment plant. Status reports will be posted on this webpage.

Download July 7, 2022, Status Report


Download July 22, 2022, Status Report

Download Aug. 5, 2022, Status Report

Download Aug. 19, 2022, Status Report

Download Sept. 2, 2022, Status Report

Download Sept. 16, 2022, Status Report

The Back River Wastewater Treatment Plant (BRWWTP) began construction in 1907 and was opened in 1911. It is owned and operated by the City of Baltimore. It is situated on the west shore of the Back River; a tributary of the Chesapeake Bay. The plant occupies a 466-acre site and has a 35-foot elevation difference from influent to outfall, allowing wastewater to flow through the plant entirely by gravity. An estimated 1.3 million residents in a 140 square mile area of Baltimore City and County are served by this plant.

The BRWWTP currently employs approximately 300 people, including supervisory, operations, maintenance, and laboratory personnel. Twenty-four-hour, year-round plant operation is maintained. Our facility has evolved into a tertiary treatment plant and is currently designed to treat 180 million gallons per day (MGD) of wastewater utilizing fine bubbles, air distributed activated sludge. Utilizing phosphorus control by chemical addition and nitrogen control by biological processes, we currently remove a majority of these nutrients. Hydraulically, the BRWWTP can handle peak flows of over 400 MGD.

Wastewater from both Baltimore City and County enters the Back River plant through two large conduits. At the plant’s Influent Metering Building, flow rates are measured by two 78-inch diameter magnetic flow meters. After treatment, as described in the following paragraphs, approximately forty percent of the final effluent is diverted through two 6-mile long pipelines to Severstal Corporation at Sparrows Point for industrial purposes. The remaining effluent passes through a 1,200-foot long outfall structure where it is gradually aerated and diffused into Back River.