Customers were credited with 1,000 gallons of water, which was likely more than enough to flush out a system. The average residential customer uses about 3,300 gallons per month.
The first area cleared was downtown Charleston, the state capital and its largest city. Hospitals were flushing out systems as were schools, which hoped to open again Wednesday.
The water crisis started Thursday when a chemical used in coal processing leaked from a Freedom Industries plant into the nearby Elk River.
Complaints came in to West Virginia American Water about the odor and officials discovered the source was the chemical 4-methylcyclohexane methanol that spilled out of a 40,000 gallon tank.