HAMMOND, Minn. -People in this hamlet of 100 people on the Zumbro River were told not to drink the water without boiling first. The alert was issued through Wabasha County Sheriff Rodney Bartsh. The advice: Water for drinking, cooking and ice-making should be boiled a full minute and cooled before consumption. The cause of the contamination was not clear except that it was bacterial. Hammond is on the Zumbro River 20 miles downstream from Rochester.