The Lincoln Memorial Reflecting Pool has been cleaned and refilled after about 80 ducklings died in the pool.
The pool's 7 million gallons were drained after crews found the bodies of the ducklings in May. Officials say the deaths were caused by a parasite in snails that lived in the water.
National Park Service spokesman Mike Litterst says that park officials will test the water more often in the future.
Most of the remaining ducklings were relocated while the pool was cleaned and treated, The Washington Post reports. Some ducklings were offered a plastic pool inside the Lincoln Memorial Reflecting Pool.