Weeks after a renovation that ended up costing taxpayers more than $16 million, the Lincoln Memorial Reflecting Pool algae returned, the water turned a murky green, and the fresh blue coating began peeling off the bottom and floating to the surface.
President Trump has a culprit in mind: vandals. Across a string of Truth Social posts, he accused “radical left lunatics” of sabotaging the pool, claimed they poured “corrosive and destructive chemicals” into the water and carved a 250-foot gash into the basin, and announced that police were making arrests.
He offered no evidence for any of it.
What the experts describe is far less dramatic — and far more predictable.
What Trump is Alleging
Trump tied the pool’s troubles to the same people he blamed for the “86 47” message cut into the National Mall grass days earlier. He said U.S. Park Police had arrested “multiple individuals,” and U.S. Attorney Jeanine Pirro warned that anyone caught adding something to the water to generate algae could face serious charges.
By Monday, Park Police said five people had been arrested on vandalism charges, five more had been cited, and 14 reports had been filed.
But the highest-profile “arrest” Trump amplified tells a different story.
The man taken in on Friday was David Hearn, a 67-year-old retired three-time Olympic canoe racer who had stopped during a 64-mile bike ride to look at the pool.
Out of scientific curiosity, he reached into the water to examine a piece of the coating that was already peeling away — and was detained for five hours.
A separate viral claim that “Antifa operatives” had been caught dumping buckets of algae into the pool was traced to an unverified Facebook post and debunked. No reputable outlet has reported any evidence that vandalism caused either the algae or the peeling paint.
Why the Water Turned Green
The reflecting pool is, in the words of the scientists who study it, an almost perfect incubator for algae.
The basin is wide, only about a foot and a half deep, fully exposed to the sun, and its water barely moves — exactly the conditions algae thrive in.
Rosalina Stancheva Christova, an aquatic ecologist at George Mason University who tested water from the pool, told NPR the bloom is growing in excess but is not toxic, and that this ordinary regional algae appears around D.C. every summer.
Left to nature, she said, it “could happen every single summer.”
It has happened before — essentially every time it reopens. The Reflecting Pool algae returned within weeks of the 2012 reconstruction under the Obama administration, forcing crews to drain and re-treat the water.
This year’s renovation likely made the bloom worse, not better. The new dark-blue bottom absorbs more sunlight and warms the water, which speeds algae growth.
Draining and resurfacing also stripped out the beneficial bacteria and biofilm that help hold blooms in check, and it disturbed the pool’s nutrient balance.
On top of that, the basin was refilled with untreated water drawn from the Tidal Basin — water that, as a local pool-service operator told reporters, is bound to bloom green.
Kym Hall, a former National Park Service regional director, questioned in the same reporting how anyone expected a coat of paint to fix a century-old problem worsened by the birds and wildlife that constantly add waste to the water.
The Interior Department, for its part, has called the bloom “residual algae” left in the supply lines during construction — a partial explanation that experts say leaves out the bigger picture.
Why the Paint is Peeling
Here the facts cut against the vandalism story even more directly.
The coating was sold as nearly bulletproof: contract documents described it as a waterproof, anti-algae system “suitable for continuous submersion.”
If it began peeling within two weeks of being submerged, that points to a failure of the work itself — not a saboteur’s chemicals.
Coating specialists say underwater paint fails for mundane, well-documented reasons.
Tim Auerhahn, a pool-infrastructure expert who chairs the Aquatic Council, told CNN that delamination like this can come from poor surface preparation, contamination, the wrong product, bad application conditions, or some combination of those — the ordinary ways a rushed coating job goes wrong.
And this job was rushed. The work was fast-tracked to be ready for the Fourth of July, layering new material onto a porous, 104-year-old concrete basin.
If that surface wasn’t properly cleaned and profiled, or if the coating wasn’t given enough time to cure before the water went back in, it can lift off in sheets.
The hydrogen peroxide later poured in to kill the algae may have stressed the young coating even more.
Atlantic Industrial Coatings, the firm that did the work, said the pool would have to be drained again and the damage would be covered under warranty — an admission, in itself, that something went wrong with the job.
The Part That isn’t About Reflecting Pool Algae
Strip away the talk of vandals, and what remains is a procurement story.
The painting was a no-bid, sole-source contract handed to Atlantic Industrial Coatings, a Virginia firm that had never held a federal contract before — but had previously done pool work at Trump’s golf club in Sterling, Virginia.
Initially floated at around $1.8 million, the painting alone ballooned to roughly $14.7 million, and with a separate no-bid contract for an algae-killing “nanobubble” system, the total topped $16 million — paid largely out of national park entrance fees.
That is the backdrop for the sudden focus on saboteurs. A routine summer algae bloom and a coating that didn’t hold are deeply embarrassing for a project that was supposed to gleam for the nation’s 250th birthday.
Blaming “radical left lunatics,” threatening years in prison, and sending officers to patrol a public pool shifts the subject away from a rushed, no-competition contract and basic biology, and toward a story about enemies.
But the science doesn’t bend to a press release. The water is being treated, the paint will have to be redone, and the bill has already come due — for the public.
