DC Water reported that recent testing shows the Potomac River remains healthy despite the large sewage discharge earlier this year.
In January 2026 a sewer line failed, releasing hundreds of millions of gallons of sewage into the river. The utility began a broader testing program in August 2026 to check for any long‑term environmental effects.
Findings released in October 2026 indicate no lasting harm to the river, confirming that water quality standards continue to be met.