WASHINGTON, DC - SEPTEMBER 26: Children look at Ducks in the Reflecting Pool in front of the Lincoln Memorial that is full of algae after recently being filled with water, on September 26, 2012 in Washington, DC. National Park Service officials have hired a contractor to remove the algae that has appeared after a two year, $34 million renovation of the pool.  (Photo by Mark Wilson/Getty Images)
80 ducklings die in monument reflecting pool
00:53 - Source: CNN
CNN  — 

The National Park Service will drain the Lincoln Memorial Reflecting Pool this weekend after approximately 80 ducklings were found dead, including 53 in one day.

The culprit is a parasite that grows in snails that live in the pool, said park service spokesman Mike Litterst.

The federal agency says chemical treatments alone aren’t sufficient to fully reduce the parasite and snail population. So the pool must be drained and cleaned.

The cleanup begins Sunday. It will take about two days to fully drain the water. On Tuesday, crews will begin cleaning the interior.

Humans who come in contact with the parasite could develop cercarial dermatitis, better known as “swimmer’s itch.” It’s not contagious and rarely requires medical treatment, but it’s uncomfortable.

Crews will refill the pool next Friday and things should be back to normal the following week.