2026 Potomac River sewage spill

2026 Potomac River sewage spill
Location of the spill along the Potomac River
DateJanuary 19, 2026 (2026-01-19)
LocationPotomac River, near Potomac, Maryland
Coordinates38°58′21″N 77°10′08″W / 38.972412°N 77.168784°W / 38.972412; -77.168784
TypeSewage spill

On January 19, 2026, a section of the 72-inch-diameter Potomac Interceptor (PI) sewer line collapsed near the Clara Barton Parkway in Montgomery County, Maryland, which is approximately 5 miles (8.0 km) upstream of Washington, D.C.[1] An estimated 240 million to 300 million gallons of untreated wastewater was spilled into the Potomac River. According to the University of Maryland School of Public Health, the sewage spill is one of the largest in U.S. history.[2]

Background

The Potomac Interceptor sewer, principally constructed in 1962, originates in the Virginia and Maryland suburbs, and transports wastewater from Dulles International Airport, surrounding communities in Virginia, and parts of Montgomery County [3] to the Blue Plains Advanced Wastewater Treatment Plant in Washington, which is owned by District of Columbia Water and Sewer Authority (DC Water). This large piping system is constructed of reinforced concrete pipe, and one section of the system is located within the Chesapeake and Ohio Canal National Historical Park. DC Water is responsible for managing most of the PI sewer infrastructure. The Washington Suburban Sanitary Commission (WSSC) manages a section of the PI in the Maryland suburbs.[4]

Emergency response and repair efforts

DC Water installed a bypass system in cooperation with the National Park Service (NPS), near lock 10 of the C&O Canal with this system using a contained part of the canal. This system carries the wastewater 2,700 feet before the water enters a non-damaged part of the Potomac Interceptor downstream.[5] Later, the bypass was enhanced with three additional pumps bringing water into the canal to later fix the broken pipe. The next steps are to add a steel bulkhead gate to block the damaged section of pipe with the excess water pumped out to work on the rock blockage.[6]

On February 16, 2026, President Donald Trump announced that the federal government will respond to the spill,[7][8] while blaming Democratic leaders of local authorities, particularly Maryland Governor Wes Moore.[9][10] A spokesman for Moore stated that, "The President has his facts wrong — again," explaining that the Trump administration is "actually supposed to be in charge here." The Maryland Department of the Environment (MDE) does not regulate DC Water, but is monitoring water quality in the river.[11] DC Water has been managing the PI repairs and is issuing daily updates.[6][12] The District of Columbia Department of Energy and Environment is issuing weekly updates about the PI, pertaining to water quality monitoring and related information.[13]

DC Water has estimated the repair and remediation costs to be $20 million. On February 18 Mayor Muriel Bowser of Washington declared a public emergency. Bowser requested federal assistance and reimbursement, and a presidential disaster declaration. On February 19 Trump announced that the federal government is responding to Bowser's request, with the U.S. Environmental Protection Agency (EPA) leading the response, along with the Federal Emergency Management Agency.[14] The US Army Corps of Engineers began providing assistance at the spill site on February 21.[15]

On March 14, the emergency repair efforts were completed. The water is now directed via the interceptor. All bypass pumps were turned off. New long-term work is being done to rehabilitate and strengthen the pipe, which is expected to take 9-10 months.[16]

Environmental impact

The wastewater had a significant impact on the bacteria levels in the Potomac. E. coli bacteria levels were hundreds of times higher than the EPA's safety levels when the water was tested. Because the river was frozen over, downstream water in Georgetown was within safety limits published by the U.S. Environmental Protection Agency (EPA).[17]

The Maryland Department of the Environment (MDE) has stated that "All active Maryland drinking water intakes are upstream and unaffected." On January 25 the agency closed one downstream shellfish harvesting area in Charles County as a precautionary measure. MDE has conducted several inspections at the spill site jointly with EPA. Three Maryland counties (Montgomery, Prince George's and Charles County) have issued health advisories recommending avoiding recreational activity in the river.[18]

On February 17, the government of Arlington County, Virginia, released an announcement that the county's drinking water was safe for human consumption. The same announcement repeated the advice of the Virginia Department of Health, which had issued a recreational activity advisory encouraging people to avoid being in the Potomac due to concerns regarding the spread of illness.[19]

The drinking water systems in Maryland and Washington are also not affected by the spill. The principal drinking water intake for Washington and Arlington is located upstream of the spill at Great Falls.[20]: 68  While a smaller, supplemental intake for the Washington Aqueduct system is located at Little Falls, downstream of the spill, it had been shut off before the January spill.[21] The Potomac River water intake for the Montgomery County system, operated by WSSC, is also located upstream of the spill.[22][23]

References

  1. ^ Hedgpeth, Dana; Williams, Clarence (2026-01-23). "Millions of gallons of sewage spilled into the Potomac River". The Washington Post.
  2. ^ Sanchez, Victoria (February 11, 2026). ""One of the largest sewage spills in history" worries DC water watchdog group". WJLA News. Washington, D.C.
  3. ^ Condon, Christine. "Maryland congressional delegation enters the fray over massive Potomac sewage spill". Maryland Matters. Retrieved 19 February 2026.
  4. ^ "From Dulles to the District". Washington, D.C.: DC Water. Retrieved 2026-02-17.
  5. ^ "DC Water Sewer Overflow". Washington, D.C.: C&O Canal Trust. Retrieved 2026-02-18.
  6. ^ a b "DC Water Advances Work to Repair Damaged Section of Potomac Interceptor". DC Water. Retrieved 2026-02-18.
  7. ^ Hedgpeth, Dana; Johnson, Carolyn Y.; Heim, Joe (2026-02-16). "Trump directs federal government to intervene in Potomac sewage spill". The Washington Post.
  8. ^ Dance, Scott; Joselow, Maxine; Niiler, Eric (February 17, 2026). "Potomac Sewage Spill Becomes Ecological Disaster and Political Fight". The New York Times.
  9. ^ Venkatraman, Sakshi (2026-02-17). "Trump directs federal authorities to manage sewage spill 'disaster'". BBC News. Retrieved 2026-02-28.
  10. ^ "Taking a cue from Trump, Fox politicizes the massive Potomac sewage spill". Media Matters for America. 2026-02-27. Retrieved 2026-02-28.
  11. ^ Condon, Christine (2026-02-16). "Moore administration pushes back against Trump claims on Potomac sewage leak". Maryland Matters.
  12. ^ Small, Matt (2026-02-16). "Progress at Potomac sewer collapse, DC Water says, but overflow risk remains". Washington, D.C.: WTOP News – via Maryland Matters.
  13. ^ "Potomac Interceptor Update and FAQs". DC Department of Energy and Environment. 2026-02-13.
  14. ^ Vazquez, Maegan (2026-02-21). "Trump approves D.C. emergency declaration in response to Potomac sewage spill". The Washington Post.
  15. ^ Condon, Christine (2026-02-23). "Army Corps joins Potomac River spill response". Maryland Matters.
  16. ^ "Potomac Interceptor Collapse | DC Water". www.dcwater.com. Retrieved 2026-03-21.
  17. ^ Gary Grumbach; Isabelle Schmeler; Corky Siemaszko (18 February 2026). "Potomac River E-coli levels skyrocket after 240 million gallons of sewage pour into waterway". NBC News. Retrieved 19 February 2026.
  18. ^ "Potomac Interceptor Sewer Overflow". Baltimore, MD: Maryland Department of the Environment. Retrieved 2026-02-19.
  19. ^ "Arlington Drinking Water Safe; Avoid Activity in the Potomac River". Arlington County, VA: Arlington County Government. February 17, 2026. News release.
  20. ^ Ways, Harry C. (1996). The Washington Aqueduct: 1852-1992. Baltimore, MD: U.S. Army Corps of Engineers, Baltimore District.
  21. ^ "Potomac Interceptor Collapse". DC Water. Retrieved 2026-02-18.
  22. ^ "Where Does My Water Come From?". Drinking Water Source Protection. Laurel, MD: Washington Suburban Sanitary Commission (WSSC). 2025-12-08.
  23. ^ "Montgomery County Pumping Station". C&O Canal Trust. Retrieved 2026-02-18.
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