Algae Infestation in the Reflecting Pool Raises Concerns

The Reflecting Pool on the National Mall is currently facing an algae infestation, specifically a genus of green algae known as Scenedesmus. Workers have been attempting to manage the situation, having eliminated one type of algae, only to see another type flourish. Testing requested by The Atlantic confirmed the presence of Scenedesmus, which is characterized by its thin appearance. The pool's water has changed colors, with some areas appearing clearer while others are murky. National Park Service (NPS) workers are conducting treatments, but there is uncertainty regarding the safety of the water due to the algae, some of which can be toxic. A spokesperson from the Department of Interior stated that ongoing water testing is being conducted, but results have not been disclosed. Scientists have expressed concerns about the effectiveness of current treatments, which primarily target blue-green algae, while the green algae continue to thrive. The NPS has been actively vacuuming algae from the pool, and there are reports of the sealant at the bottom of the pool beginning to peel off, raising further concerns about the renovation project.