The news outlet reported the singer's admission was met with a series of "Eww!" and shocked "swim in the river?!" exclamations from concertgoers and even resulted in the Potomac Conservancy responding with a post on their Twitter account.
Enlightening international fans as to why the crowd was so horrified, the post explained it's not only unsafe to swim in the Potomac River surrounding DC but also illegal.
Despite the singer seemingly being left without any side effects from her pre-show swim, many fans took to Twitter to share their horror.
One fan said, "Wildest part of the Lorde concert thus far: she's talking about swimming in the Potomac river today. Lorde, I love you but noo it's so contaminated!"
Another person posted a video of the Royals singer finding out why the crowd was so horrified by the activity.
"Now I know why you were all laughing. I'm happy to be a DC meme," The popstar can be heard saying with a sheepish look on her face.
Only two months ago, the Green Light singer revealed the response to her Solar Power album was "painful".
Speaking about the album that was released last year, the singer said, "It took people a while to get the album — I still get emails every day from people who are just coming around to it now! — and that response was really confounding and at times painful to sit with at first."