The National Park Service is treating algae growth in the Lincoln Memorial Reflecting Pool using hydrogen peroxide, according to a Department of the Interior spokesperson. Multiple outlets report that workers begin adding the chemical to the water feature as part of efforts to address a new algae bloom. The reports link the current algae problem to the recent renovation of the Reflecting Pool under the Trump administration, citing a multi-million-dollar overhaul that included resurfacing and other changes to the pool’s appearance and base. One outlet describes the bloom color change as turning the pool a chartreuse or greenish tone, indicating the algae’s spread. Other coverage characterizes the approach as part of the White House’s plan to manage conditions after the renovation and to restore the water feature’s clarity. The articles consistently describe hydrogen peroxide as the primary treatment used by park staff or contractors and present it as a response to algae returning after the recent refurbishment. The reports do not provide final results or detailed environmental monitoring outcomes at this stage.