Overview
- The freshly refilled Lincoln Memorial Reflecting Pool developed a visible algae bloom within days of reopening in mid‑June, and National Park Service crews were seen vacuuming clumps, pouring hydrogen peroxide, and deploying ozone “nanobubbler” equipment to remove it.
- The Interior Department says the nanobubble ozone system is operating and that the algae is being killed and vacuumed up, while independent experts warn warm shallow water, high phosphates and dark new paint make repeated blooms likely.
- The expedited renovation was awarded through urgency, no‑bid contracting to firms with prior ties to Trump properties, and reported contract costs grew from initial estimates to roughly $14–16 million, raising questions about oversight and spending.
- Reporting shows the project sealed and painted the basin but did not replace the buried 12‑inch circulation pipes that move water to the filtration plant, with officials saying pipe repairs are planned for the fall.
- The pool’s long history of recurring algae and a 2012 $34 million rebuild underscore the challenge ahead, and the bloom could affect July 4 semiquincentennial plans while keeping maintenance needs and legal preservation disputes in the spotlight.