Despite a $14.8 million renovation that included painting the bottom of the Lincoln Memorial Reflecting Pool a dark 'American flag blue,' an algal bloom has turned the water green. National Park Service and contractors are using ozone nanobubbles, hydrogen peroxide, and vacuuming to clean it, but experts warn the scale of the pool and its untreated river water source make algae control a persistent challenge.
The Lincoln Memorial Reflecting Pool , recently renovated with a new dark blue paint job as part of President Donald Trump 's initiative, is facing an algal bloom that has turned the water chartreuse.
The $14.8 million project, which aimed to beautify the iconic Washington, D.C. landmark ahead of the country's 250th anniversary, has encountered unforeseen challenges due to the pool's massive size-larger than ten Olympic pools-and its source of water: the often stagnant Tidal Basin. National Park Service workers and contractors are employing chemicals, ozone nanobubbles, and vacuuming to combat the algae, but experts warn that without a complete water change and continuous treatment, the problem may persist.
The new dark bottom, while aesthetically intended, has inadvertently warmed the water, creating an ideal environment for algae growth. Visitors, including supporters of the president, observed the cleaning efforts amidst the green-tinged water, highlighting the tension between the administration's vision and natural ecological processes. The Pool Service Company's Cochise Wanzer II noted that using untreated river water inevitably leads to such issues, suggesting a full drain and fresh water treatment as the only lasting solution.
The Park Service maintains that the hydrogen peroxide and ozone methods are environmentally safe, but the immediate result is a stark contrast between clean patches of blue paint and expansive green swaths, reminiscent of a carpet being vacuumed. This incident underscores the difficulty of maintaining such a large, open-air water feature with natural water sources, despite modern purification techniques
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