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Green algae return to reflecting pool days into Trump’s renovation

Crews are using hydrogen peroxide and nanobubbler technology to clear the bloom after a $14.2 million renovation meant to keep the pool blue.

  • Just days after a $14.2 million renovation, the Lincoln Memorial Reflecting Pool became overrun with algae, threatening preparations for the nation's 250th anniversary celebration on July 4.
  • President Donald Trump commissioned the project to seal leaks and paint the basin "American Flag Blue," previously disparaging the pool as "filthy" and "dirty" for years.
  • On Sunday, National Park Service workers in waders manually cleared algae with hand tools, while the Department of the Interior attributed the growth to "residual" material from supply lines dormant during eight weeks of construction.
  • Hans Paerl, Research Professor of Marine and Environmental Sciences at the University of North Carolina at Chapel Hill, told USA TODAY on Monday the pool may remain impacted by algae as temperatures rise.
  • Algae thrives in hot weather but dissipates in cooler months, experts explained, meaning July temperatures in the upper 80s and 90s may complicate efforts to restore the pool's blue appearance before Independence Day.
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Center

The water in the pool, which was designed to be bright blue, has turned yellowish-green.

·Finland
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Associated Press NewsAssociated Press News
+13 Reposted by 13 other sources
Lean Left

Trump administration uses hydrogen peroxide and tiny bubbles against algae in Reflecting Pool

President Donald Trump's remodeled Lincoln Memorial Reflecting Pool has turned chartreuse from an algal bloom.

·New York, United States
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Lean Left

Trump's prestige project at Lincoln Memorial should shine in bright blue. Hardly is the million-dollar renovation finished, there is another problem.

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CNN broke the news in Atlanta, United States on Sunday, June 14, 2026.
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