Test results confirm it was diesel that contaminated the Whitesburg water supply and officials say Don Childers is responsible.
Thousands of people in Letcher County remain under a non-consumption advisory.
Letcher County Judge Executive Jim Ward says once the water is confirmed safe, they will lift the advisory...possibly as early as Sunday.
State officials say damaged fuel storage tanks leaked into the river four miles upstream from the water plant intake.
The tanks are the property of Childers Oil and officials say owner Don Childers was issued a notice of violation Friday.
He faces fines of up to $25,000 per day, per violation.
Childers was also found responsible for a similar leak last November.