What the records say
- When
- 19 Jan 2026
- Kind
- Industrial accident
- Coordinates
- 38.97° N, 77.17° W
- Description
- environmental disaster involving a sewer collapse in Maryland in January 2026
- Cause
- structural failure
2026 Potomac River sewage spill
Sewage spill in the United States
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, approximately 5 miles (8.0 km) upstream of Washington, D.C. An estimated 240 million to 300 million gallons of untreated wastewater was spilled into the Potomac River.
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