Algae Turns US Reflecting Pool Green Despite $14 Million Renovation

Algae bloomed in the Reflecting Pool at the National Mall on June 14, 2026, turning the water green [1, 2].

The event highlights a failure of recent infrastructure efforts to maintain the iconic Washington, D.C. landmark during extreme summer weather. The pool serves as a primary visual centerpiece for the U.S. capital, and its discoloration draws significant public and political scrutiny.

President Donald Trump previously ordered workers to paint the base of the Reflecting Pool blue to ensure a consistent appearance [1, 2]. This effort was part of a larger renovation project that cost $14 million [2, 3]. Despite these expenditures, the water shifted to a green hue as the D.C. heat intensified earlier this week [2, 3].

Officials and reports said the bloom was caused by a combination of high temperatures and lingering underlying problems within the pool's system [2, 3, 4]. The $14 million investment was intended to address these issues, but the organic growth persisted [2, 3].

There are conflicting reports regarding the administration's reaction to the water's appearance. One report said the president celebrated the water as beautiful and described it as quite green in a positive post ^[2]. However, other reports focused on the visible presence of algae as a failure of the renovation project [1, 2, 3].

The pool is located near the Lincoln Memorial and is subject to high visibility from tourists and government officials ^[4]. The current state of the water reflects a struggle to balance aesthetic preferences, such as the blue paint, with the biological realities of a large, open body of water in a humid climate [2, 3].