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By Alice Gibbs
Senior Reporter
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David L. Gadis, DC Water CEO and general manager, has addressed the public after a major sewer pipe failure sent hundreds of millions of gallons of wastewater into the Potomac River, an incident experts have described as one of the largest sewage spills in U.S. history.
In an open letter dated February 11, Gadis acknowledged widespread concern following the January 19 collapse of a section of the Potomac Interceptor sewer line that was over 60 years old, calling the incident "deeply troubling" and recognizing the frustration and distress expressed by residents, environmental advocates and river users.
"The Potomac River is a shared natural treasure, and any event that threatens its health understandably causes concern, frustration, and a sense of loss," Gadis wrote. "Those feelings are not only valid—but they are also shared by all of us at DC Water."
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What To Know
According to DC Water, the failure occurred along the Clara Barton Parkway near the Interstate 495 interchange, when security cameras detected unusual activity near one of the utility’s odor control facilities.
Crews later discovered a collapse in a 72‑inch‑wide section of the Potomac Interceptor sewer line, triggering an uncontrolled overflow of wastewater into the Potomac River.
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The sewer system pipe collapsed on January 19, leading to an estimated 250 million gallons of wastewater overflowing before an emergency bypass system was activated on January 24 to reroute flows and stop the discharge.
The Potomac Interceptor, built in the early 1960s, carries around 60 million gallons of wastewater each day to the Blue Plains Advanced Wastewater Treatment Plant.
Gadis said DC Water crews and contractors worked around the clock, including through sub‑freezing temperatures and winter weather, to contain the overflow, protect public safety and begin repairs.
Why It Matters
Health and environmental experts have warned that the spill poses potential public health risks. The University of Maryland’s School of Public Health described the incident as "one of the largest sewage spills in U.S. history," saying water testing detected fecal‑related bacteria and pathogens that raised urgent concerns about aging sewer infrastructure.
Experts have noted that, although fewer people may be swimming during winter months, bacteria can survive in freezing temperatures and become active again as conditions warm. Testing identified risks associated with E. coli bacteria and Staphylococcus aureus.
Gadis said the incident highlights broader challenges facing utilities nationwide as decades‑old infrastructure operates under modern environmental standards, population growth and climate pressures.
What People Are Saying
Rachel Rosenberg Goldstein, a microbiologist and assistant professor at University of Maryland’s department of global, environmental and occupational health, said in a statement: "People coming into contact with the impacted water or land are at risk of becoming infected with these bacteria, which can lead to serious health conditions."
David L. Gadis, CEO and general manager of DC Water, said in an open letter: "We recognize that describing response actions and infrastructure details does not erase the environmental impact or the concern this incident caused. For those who live near the river, recreate on it, or work every day to protect it, witnessing this unfold was distressing. We hear that clearly…Restoring confidence—both in the river’s health and in our stewardship—requires more than repairs. It requires listening, learning, and continuous improvement."
What Happens Next
In his letter, Gadis pointed to DC Water’s long‑term investments, including a $625 million commitment to rehabilitate the Potomac Interceptor as part of a 10‑year, $10-billion capital improvement program.
Gadis also cited the utility’s Clean Rivers Project, which he said has already prevented more than 19 billion gallons of combined sewage from entering local waterways, as well as construction of the Potomac River Tunnel designed to reduce future overflow events.
Gadis said DC Water plans to continue environmental monitoring, maintain frequent public communication and engage directly with community members and environmental partners as assessment and restoration efforts continue.
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