 I haven't eaten since the day before yesterday. Houston's main utility provider claims 8% of those without should have power back by the end of the weekend. The water has finally been deemed clean enough for Olympic athletes at the Summer Olympics. CBS's Elaine Cobb. Paris officials say the River Seine has been safe for swimming 10 or 11 of the past 12 days. 1.5 billion dollars have been spent on cleaning the river where the swimming marathon and triathlon swimming are slated to take place.