Green algae reappeared in the Lincoln Memorial Reflecting Pool in Washington, D.C., just days after the completion of a multimillion-dollar renovation project.

The recurrence of the algae follows a high-cost effort to modernize the iconic site, raising questions about the efficacy of the repairs and the management of the National Park Service.

President Donald Trump ordered the renovation, which cost $14.2 million [1]. The pool, which spans more than 2,000 feet [3], underwent eight weeks of construction before the algae returned in early June 2024 [2].

An Interior Department spokesperson said the algae was "residual" and from supply lines that were dormant during eight weeks of construction [2]. National Park Service crews have since worked to clear the water, though a Politico report said workers are struggling to remove algae from the surface of the Reflecting Pool [2].

While government officials cite technical residues, other figures have suggested the incident was intentional. Grant Stinchfield said left-wing saboteurs are behind the algae [2].

The project aimed to ensure the longevity of the pool's infrastructure, yet the immediate return of the discoloration has drawn scrutiny. The renovation cost is cited between $14 million [2] and $14.2 million [1], depending on the source.

“the algae was 'residual' and from supply lines that were dormant during eight weeks of construction.”

The rapid return of algae to a site that just underwent a $14.2 million overhaul highlights the technical difficulty of maintaining large-scale urban water features. The divergence between the Interior Department's explanation of 'residual' algae and claims of sabotage reflects a polarized political environment where infrastructure failures are often framed as intentional acts rather than engineering lapses.