Significant Progress Made to Reinforce Downstream Section of Damaged Potomac Interceptor

March 07, 2026
geopolymer downstream

Significant Progress Made to Reinforce Downstream Section of Damaged Potomac Interceptor

  • As emergency repairs continue, today marks 27 days, nearly one month, with no overflow reaching the Potomac River. The last release that entered the river was February 8.
  • Crews are making significant progress to reinforce the downstream section of pipe from the collapse site and completed 240 linear feet of geopolymer overnight. Crews are working to apply another layer of geopolymer today. The material is similar in strength to concrete and when applied restores the structural integrity of the pipe.
  • Completing the geopolymer on the downstream section of pipe is the last major step in the emergency repair.
  • DC Water crews are working on clearing trees and brush in Area 1, closest to the collapse site, as part of the environmental rehabilitation work. They will also be installing silt fences and performing erosion and sediment control.
  • After an area is cleared, annual rye seed, straw, and coir matting are being applied for soil stabilization.
  • Residents and community members who would like to provide feedback on the Environmental Rehabilitation Plan will now be able to contact us to fill out a form through our dedicated webpage for the Potomac Interceptor Repair.
  • Geopolymer work was completed yesterday on the upstream section of the damaged pipe, covering more than 300 linear feet. This marked the halfway point in the emergency repair.
  • Once the emergency repair is completed, the flow will be restored to the Potomac Interceptor and the bypass pumping system deactivated. Work continues concurrently on the environmental rehabilitation. Daily water quality sampling also continues.

crews doing soil stabilization

Water Quality Sampling Results

Fluctuations in water quality are influenced by factors such as weather events, river flow, runoff, pollutants, releases of combined overflows, and other sources discharging into waterways. Given these variables, measurements taken much further downstream cannot be attributed solely to this incident.

For the Potomac River, historical water quality data shows E. coli levels may vary from a range as low as 10 MPN/100mL to as much as 5,000 MPN/100mL on a given day. A more detailed explanation is posted on the District Department of Energy and Environment (DOEE) website at doee.dc.gov/release/potomac-interceptor-update-and-faqs.

As of March 4, two new sampling locations have been added at Sycamore Island and Lock 6. Sample results from February 23 - present. Past results may be found here.

For quality assurance purposes, lab results are unavailable on weekends and will be posted on the following Monday, excluding holidays.

graphic of water quality testing

 

Latest News

Map of lane closure on Clara Barton Parkway at Maryland-DC Border

Drivers should expect delays on Clara Barton Parkway at the Maryland – DC border on Saturday, Sept 26. One lane will be closed from 7 a.m. to 3 p.m. while DC Water makes repairs as part of ongoing ...

Christening of TBM Emily with DC Water Interim General Manager Matt Brown holding bottle of tap water to christen Emily

DC Water celebrated the christening of Emily today. It’s the second giant tunnel boring machine (TBM) that will help build the 5.5-mile Potomac River Tunnel. The celebration continued with Community Day. Residents and families met Emily and stepped inside the tunnel where she will soon begin digging.

Map: Temporary closure of the southbound curb lane on Rock Creek and Potomac Parkway NW

DC CLEAN RIVERS – POTOMAC RIVER TUNNEL PROJECT

Drivers should expect a temporary southbound lane closure on Rock Creek and Potomac Parkway NW between F St and Virginia Ave on Saturday, September 19, and Sunday, September 20, 2026. The closure will be in place from 7 a.m. to 7 p.m. each day, weather permitting.

Upcoming Meeting

Board of Directors Meeting

April 24, 2023

Monday 9:00 AM

Announcement

Christening of TBM Emily with DC Water Interim General Manager Matt Brown holding bottle of tap water to christen Emily
DC Water Welcomes the Community Underground to See the Potomac River Tunnel and Christens Tunnel Boring Machine Emily

DC Water celebrated the christening of Emily today. It’s the second giant tunnel boring machine (TBM) that will help build the 5.5-mile Potomac River Tunnel. The celebration continued with Community Day. Residents and families met Emily and stepped inside the tunnel where she will soon begin digging.

Latest Blog Post
Emergency supplies arranged on a table, including bottled water, canned food, a backpack, first aid kit, flashlight, phone, medication and other essential items.
Simple Ways to Stay Prepared at Home
A few simple steps can help your household prepare for severe weather and temporary water or sewer service interruptions.
Upcoming Meeting
Date
October 8, 2026
Thursday, 9:30 AM

Upcoming Events

Customer Service Center Announcement

Payment Plan Incentive: provides a credit back of 50% of the last 3 payments made. Eligible participants are residential customers who have had an outstanding balance for 60 days or greater and with an outstanding balance of $500 or more.