Asked about reports of vomiting and irritation from people who came in contact with the contaminated water, McIntyre said: "I'm not able to link anybody's illness to this event."
In the meantime, mobile water haulers have been deployed to provide customers with water, and four tractor-trailer loads of bottled water have been purchased to provide residents in affected areas with water.
A federa investigation was also underway.
FEMA now says there are 75 trucks on their way from Cumberland and Frederick in Maryland, each carrying 18,500 liters of water. The arrivals will be staggered though so all 75 will not arrive at once.
FEMA said it was anticipating the first group of 53 trucks to arrive around 7 p.m. today at Yeager Airport in West Virginia.
"This has been devastating to the public at large and to the people who live in our city," said Charleston, W.Va., Mayor Danny Jones at the news conference.
The Associated Press contributed to this article.