After the raw sewage flows in the C&O Canal pass a cave-in of a 72-inch interceptor sewer, they pump the sewage back into the sewer. During the six days it took to get the pumps operational, all of the raw sewage was overflowing into the Potomac River.
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| Facebook Reel https://www.dcwater.com/about-dc-water/media/news/update-dc-water-activates-bypass-contain-wastewater-overflows-potomac |
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| dcwater The collapse occurred Jan 19, and the pumps stopped the river pollution on Jan 24. Fortunately, the intake for DC's water supply is upstream of this sewer overflow. |
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| The DMV Daily posted Repairs to a massive sewage spill contaminating the Potomac River could take weeks or even months longer than expected, according to DC Water. The spill began Jan. 19 after a 72-inch sewer pipeline, known as the Potomac Interceptor, collapsed near Glen Echo, Maryland, sending raw sewage directly into the river. DC Water estimates about 243 million gallons of wastewater equal to 368 Olympic-sized swimming pools have spilled so far, mostly in the days before emergency bypass pumping was activated. Crews later discovered a large rock and debris blockage inside the pipe, complicating repairs. Clearing the obstruction could take four to six weeks, after which the timeline for permanent repairs will be determined. While DC Water says recent testing shows E. coli levels within federal safety standards, environmental groups dispute those findings and warn the river may still be unsafe for recreation. Monitoring and cleanup efforts are ongoing. 📸: @dc.water Chad Schoelkopf: E-coli levels 4,000 times higher than a safe level and DC says they are within safe limits 😡 |
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| Kem Clawson commented on the above post We live about 20 miles down river and starting Sunday the river looked like a waste treatment facility. Now with the warmer temps it SMEELS like one. |
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| Ginger Morrison commented on the above post The levels are off the chart! |
I repeat an above statement: "DC Water says recent testing shows E. coli levels within federal safety standards." When will institutions learn to not say anything rather than tell a blatant, testable, lie?
E. coli levels over 10,000 times the recreational water quality limit have been found. "DC Water estimated that during the peak of the crisis, the pipe was discharging 40 million gallons per day for at least six days." [WUSA9_unsafe, Jan 28, 2026]
Feb 10, 2026: DC Water admits they reported incorrect E. coli levels and provides new figures.
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| dcwater_feb10 "As noted previously, data highlighted in yellow represents corrections made following a review of the sampling data that identified reporting errors. These errors were promptly corrected, and additional quality control measures have been implemented to ensure the accuracy of the data being reported." |
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| DC Water on X/Twitter "Pumping challenges continue at the damaged Potomac Interceptor. Two pumps clogged w/non-disposable wipes Monday night, causing an overflow & contained on-site. E. coli levels remain elevated at collapse site, downstream levels remain below EPA standards" |
Feb 11, 2026:
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| WUSA 9 posted Super Bowl bathroom breaks triggered a sewage overflow into the Potomac River after non-flushable wipes clogged DC Water's system: https://www.wusa9.com/.../65-bbe1af6c-6dd0-4aad-bb99... "Non-flushable wipes cause more sewage spills into Potomac River during Super Bowl" |
Some comments have wondered what the impact on the crabbing industry in the Chesapeake Bay might be.
Background
The interceptor sewer was built to support Dulles Airport and the surrounding developments.
Between 2001 and 2015, DC Water inspected the entire interceptor. "The individual pipe segments inspected indicate the majority of the pipe segments show signs of corrosion, and some show settled deposits." [dcwater_inspections]
<rant>
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| dcwater_PI |
Between 2001 and 2015, DC Water inspected the entire interceptor. "The individual pipe segments inspected indicate the majority of the pipe segments show signs of corrosion, and some show settled deposits." [dcwater_inspections]
They have been working on repairs. In fact, they worked on a segment just upstream of the collapse.
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| dcwater_high_priority via dcwater_PI |
<rant>
The webpage about the inspections contains:
Information about specific rehabilitation efforts is available under the Projects section of this website, including:
But when I tried accessing either of those links, I got:
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| Either of the above two links. |
</rant>
Feb 13, 2026:
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| Fairfax County Government posted The Virginia Department of Health (VDH) posted information regarding the Jan. 19 Potomac River sewage spill. Because Maryland has regulatory authority over the Potomac River, VDH is deferring to Maryland Department of the Environment for management of response and monitoring activities related to this event. However, Virginia residents are urged to use caution on the Virginia shoreline of the Potomac River. [The caption explains these are the sites were DC Water collected bacteria samples. It conspicuously doesn't say what the results are.] |
Feb 13, 2026: This video shows that the pumps are discharging upstream of Lock #13 of west of I-495. That disagrees with the information I found above. In fact, this is close to the area of repair. So now I wonder if it was a construction accident.
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| Facebook Reel |
This shows where the sewage is being diverted from the C&O Canal back into the sewer down around Lock #10.
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| Facebook Reel |
They have increased their pumping capacity from 36m to 100m gallons per day. A normal big flow is 60mgpd.
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| Same Reel |
This is the nearby rehab work they were doing before the collapse.
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| Facebook Reel |
DC Water has been issuing daily news releases.
The pipe is reinforced concrete pipe. But "the sewer gases have eaten the concrete to a point of failure." [Brew Kennedy on a Facebook post]
No wonder they are shoving a new lining into the pipe in some segments.
They need to review their inspection procedures because the fixed the wrong segment.
If the concrete fails, why hasn't some Chicagoland sewers failed? This ED sewer was installed for Dulles Airport. I was alive when that was built. A lot of Chicago's sewers were built in the 1920s when Water Reclamation Plants were first developed. I wasn't alive back then.
Feb 25: They now have 14 pumps that can handle 150 million pumps per day. "Excavation around the damaged section is now fully extended. Approximately 45 feet of the rock and debris dam have been removed, with another 8 to 10 feet of remaining rock and debris still to go." A comment indicated that "this particular section was already slated to be upgraded next year." Some comments indicate that the pipe looks way too thin for a concrete pipe and that the backfill is rubble instead of crushed rock. [Facebook post] (I know that Downers Grove backfills with crushed rock because I have watched some construction.)
Feb 26: I've finally seen a completion date estimate: mid-March. [DC Water posted]
Mar 15: the Chicago Tribune had a few paragraphs about the sewage flow being returned to the sewer rather than being pumped into the canal.
I still haven't figured out how to get a date for a Facebook Reel. It looks like there is only half the sewer pipe their. What happens if the flow is over one half of the pipe's capacity?
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| Facebook Reel |
I think this is the mess that they now have to cleanup in the canal.
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| Same Reel |
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