WASHINGTON, D.C. — Green algae has reappeared in the Lincoln Memorial Reflecting Pool just days after the completion of a $14 million renovation project ordered during the Trump administration, prompting questions about the effectiveness of the upgrades.
Visitors to the National Mall observed thin green films forming near the World War II Memorial end of the pool on Friday. Workers were seen treating the water and removing algae as officials worked to address the issue.
According to the Department of the Interior, the algae growth is the result of residual algae remaining in water supply lines that sat unused during the eight-week construction project. Spokesperson Katie Martin said the buildup is a common startup issue following major maintenance work and is expected to clear as the new system reaches normal operation.
The renovation included installation of a new ozone-based filtration system known as a “nanobubbler,” which National Park Service officials say will improve long-term water quality and reduce algae growth. Approximately $1.7 million of the project’s funding went toward the upgraded filtration technology.
The project attracted attention earlier because of its escalating cost. Initial estimates reportedly placed the work at less than $2 million before costs increased to approximately $14 million. Critics also questioned the use of a no-bid contract awarded to a contractor whom President Donald Trump reportedly referred to as his “pool guy.” Media reports noted the contractor had limited experience with large public reflecting pools.
Officials emphasized that algae issues are not unique to this renovation. The Reflecting Pool experienced similar problems after a major $34 million rehabilitation completed during the Obama administration in 2012.
The renovation is part of broader efforts to prepare federal monuments and public spaces in Washington for celebrations marking the 250th anniversary of the United States in 2026.
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