Overview
- D.C. Water announced that expanded testing shows no current signs of lasting harm to the Potomac River after the January 2026 collapse of the Potomac Interceptor sewer line.
- Emergency repairs restored flow to the broken section in March 2026, and a broader rehabilitation of the 54-mile sewer conduit is still underway with four other critically damaged sections identified for repair.
- Shortly after the collapse, D.C. Water ran daily E. coli tests at multiple upstream and downstream sites for more than six months and lifted health advisories once bacteria levels returned to typical ranges.
- Federal and state regulators sued D.C. Water in April 2026 over maintenance failures and the Washington Suburban Sanitary Commission joined the suit in September 2026, and D.C. Water has declined interview requests because of ongoing litigation.
- Reports vary on the spill size with one account citing about 243 million gallons released, and local residents and businesses say they will watch repair work, testing transparency and court outcomes for how the river and riverside activities recover.