"I can tell you with great assurance what the results were yesterday, but today is the day you want to go swimming," [Wendy Ralley] said. "That's why we post advisory signs."

"It is super-frustrating for the general public, the media and us," she said. "We don't have good, reliable, same-day results. The science isn't there."

"I don't really think it's something that's controllable," said Brady Anderson, a University of Manitoba film student from Red Wing, Minn. "Just don't drink the water."