The Rockland and Westchester County Departments of Health are urging people to avoid any direct contact with the water in the Hudson River from Rockland Lake Park and to the south.
A sewage line break in Tarrytown overnight Wednesday and into Thursday morning.
That could disrupt Saturday's Ironman U.S. Championship, which includes a 2.4-mile swim in the Hudson River.
Race officials released the following statement regarding the situation Thursday:
"We are diligently monitoring the situation and are working with local entities to ensure the appropriate testing protocol is followed. Athlete safety is our first priority. We will be sure of the water quality and that the venue is safe before we allow our athletes to swim on Saturday."
The event has created controversy locally, with from the Orange County line to the George Washington Bridge from 2 a.m. to approximately 8 p.m. Saturday to accommodate the event. The 112-mile bicycle portion of the Ironman Championship will be held on the Palisades. The event also includes a 26.2-mile run from Ft. Lee, NJ to Riverside Park in Manhattan.