A three-day Phish music festival at Watkins Glen was cancelled because of dirty water from torrential rains. Health officials denied a permit just as the rock band was about to go onstage for its sound check.The Curveball festival was expected to draw more than 30,000 fans starting on Friday. A mandatory order to boil water was issued for the area on Thursday after days of heavy rain. The New York State Department of Health said tests showed it would be impossible to deliver clean drinking water to festival patrons and vendors. A 14-county state of emergency was in effect on Thursday, two days after storms poured more than 6 inches of rain on towns between Seneca and Cayuga lakes, washing out roads and swamping cars and mobile homes. More storms were anticipated.