GRAND CANYON, Ariz. - A boil water notice has been lifted after E. coli was discovered in water at the bottom of the Grand Canyon.
"Bacterial contamination can occur when increased run-off enters the drinking water source (for example, following heavy rains)," said Grand Canyon NPS in a statement. "It can also happen due to a break in the distribution system (pipes) or a failure in the water treatment process."
The Grand Canyon recently experienced severe flooding brought on by the remnants of Tropical Storm Hilary.
Visitors were temporarily advised to not consume any water in the area without boiling it first to kill off the bacteria.
On Sept. 6, the advisory was lifted after officials said testing confirmed that the water is safe to drink and cook with.
The park is conducting further tests to see what caused the contamination.