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UPDATE: Potomac Interceptor Collapse, February 9
DC Water and its contractors continue working around the clock, to operate, clean and maintain bypass pumps that divert wastewater around the damaged section of the Potomac Interceptor and return flows into the system further downstream. Despite these efforts, a significant overflow occurred late Sunday.
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Traffic Advisory: Emergency Lane Closures Due to Risk of Collapse—14th Street NW south of Thomas Circle
DC Water is taking emergency measures with the immediate and ongoing closure of all northbound lanes of 14th Street between L Street NW and Thomas Circle, due to the imminent risk of collapse posed by an abandoned, century-old, brick-lined sewer tunnel beneath the roadway.
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UPDATE: Potomac Interceptor Overflow Repair - February 8, 2026
Work continues on the Potomac Interceptor, a section of which collapsed on January 19, along Clara Barton Parkway and the I-495 interchange and C & O Canal Historical Park causing a sanitary sewer overflow.
A bypass system established five days after the overflow occurred continues to successfully divert wastewater around the collapse site and back into the Potomac Interceptor further downstream.
However, late this evening a limited overflow occurred at the site but wastewater did not reach the Potomac River. An estimated 3600 gallons overflowed and was captured by site containment measures ...
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A significant overflow occurred overnight when multiple pumps were temporarily offline for cleaning and maintenance after becoming clogged by non-disposable wipes that were flushed into the system. This reduced capacity during a high-flow period. A smaller overflow earlier in the day was fully contained on site. Five new high-capacity pumps are being tested and may arrive this week to support additional bypass pumping and help prevent similar incidents. Construction on new bypass connections also continues. DC Water is preparing an Environmental Restoration Plan which is still in development and continues water quality sampling. Elevated E. coli at Lock 10 remains tied to snowmelt and residual wastewater and periodically impacted by overflow events. What this means: ✔️ Last night’s overflow happened because pump capacity temporarily dropped. ✔️ New pumps to support additional bypass pumping will make the system more stable. ✔️ Crews must finish the expanded bypass setup before rock removal can begin. ✔️ Drinking water is not affected. Details ▶️: https://www.dcwater.com/about-dc-water/media/news/update-potomac-interceptor-collapse-february-9
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