The West Virginia Department of Environmental Protection issued an update on Monday evening indicating that the Elk River spill in West Virginia earlier this month involved more gallons of chemicals than previously reported.

Freedom Industries, which owned the tank that leaked into a river supplying water in the state, now says that approximately 10,000 gallons of the chemicals 4-methylcyclohexane methanol (also known as MCHM) and PPH were released. The company initially said 7,500 gallons spilled, and failed to disclose the presence of the second chemical until last week. The leak, first reported on Jan. 9, left hundreds of thousands in the capital region without access to tap water for days. Though the formal advisory on the water has been lifted, some in the region say they are still concerned about the safety of their water.

The DEP's press release provides Freedom Industries' newest estimate, but notes, "It is not known how much material spilled into the Elk River and shut down the drinking water supply for citizens across nine West Virginia counties."

""We are not making any judgment about its (estimate) accuracy," DEP Secretary Randy Huffman said in a statement, referring to the company's latest spill figure. "We felt it was important to provide to the public what the company has provided the WVDEP in writing. We are still reviewing the calculation, and this is something that will be researched further during the course of this investigation."

“This is the first calculation that has been provided concerning the amount of materials that spilled on Jan. 9,” Huffman said. "This new calculation does not change any of our protocols in dealing with this spill, nor does it affect the ongoing remediation efforts. Our actions have never been dependent on what Freedom has reported to us. From the start, we have acted aggressively to contain the spill and remediate the site."