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People kayak in the Animas River near Durango, Colo. on Aug. 6, 2015, in water colored from a mine waste spill.

Waste water continues to stream out of the Gold King Mine near Silverton, Colo. on Aug. 11, 2015. Environmental activist Erin Brockovich, made famous from the Oscar-winning movie bearing her name, visited the nation聮s largest American Indian reservation on Tuesday, Sept. 8, 2015, to see the damage.

Crews work at two of the retention ponds at the bottom of Gold King Mine on August 13, 2015 at Gladstone townsite. Members of the EPA, Environmental Restoration, Weston Solutions and the U.S. Coast Guard are working on cleaning up the water in the four retention ponds and helping with the creation of the fifth.

A worker from Weston Solutions walks next to one of the retention ponds at the bottom of Gold King Mine on Aug. 13, 2015 at Gladstone townsite.

Dan Bender, with the La Plata County Sheriff's Office, takes a water sample from the Animas River near Durango, Colo., Thursday, Aug. 6, 2015. The U.S. Environmental Protection Agency said that a cleanup team was working with heavy equipment Wednesday to secure an entrance to the Gold King Mine. Workers instead released an estimated 1 million gallons of mine waste into Cement Creek, which flows into the Animas River.

The opening to the Kohler Mine along the Red Mountain Pass on Aug. 13, 2015. Although bulkheaded, the mine is still slowly leaking water that is making its way into the Animas River.

The opening to the Kohler Mine that has been bulkheaded August 13, 2015 along the Red Mountain Pass. Although bulkheaded, the mine is still slowly leaking water that is making its way into the Animas River. The San Juan County and the city of Silverton have a rich mining history with hundreds of mines being in the county including the Gold King Mine which spilled wastewater into the Animas River. Many of these mines were left abandoned or not properly bulkheaded which opens the possibility of wastewater draining into the rivers and creeks below.

Acidic wastewater discharge flows from the Red and Bonita Mine portals north of Silverton August 7, 2015. Over a million gallons of mine wastewater has made it's way into the Animas River closing the river and put the city of Durango on alert.

Mine wastewater empties into pits below mines north of Silverton August 7, 2015 along Animas River. Over a million gallons of mine wastewater has made it's way into the Animas River closing the river and put the city of Durango on alert.

An Environmental Protection Agency contractor keeps a bag of lime on hand to correct the PH of mine wastewater flowing into a series of sediment retention ponds, part of danger mitigation in the aftermath of the blowout at the site of the Gold King Mine, outside Silverton on Aug. 14, 2015. EPA contractors released more than 3 million gallons of contaminated water Aug. 5 while working at an inactive mine site near Silverton. States and Indian tribes said on Thursday, March 24, 2016, that they are getting ready in case runoff from melting snow stirs up potentially toxic metals in two rivers after a massive spill from a Colorado mine last August.

Water flows down Cement Creek just below the site of the blowout at the Gold King mine which triggered a major spill of toxic wastewater outside Silverton in this 2015 file photo.

Mine wastewater covers rocks from a mine along County Road 110 August 13, 2015 at the Gladstone townsite. Members of the EPA, Environmental Restoration, Weston Solutions and the U.S. Coast Guard are working on cleaning up the water in the four retention ponds and helping with the creation of the fifth.

Water flows through Cement Creek carrying some of the dirt from the construction of the fifth retention pond August 13, 2015 at Gladstone townsite. Members of the EPA, Environmental Restoration, Weston Solutions and the U.S. Coast Guard are working on cleaning up the water in the four retention ponds and helping with the creation of the fifth.

Mine wastewater washes up on shore August 7, 2015 along Animas River. Over a million gallons of mine wastewater made its way into the Animas River closing the river and putting the city of Durango on alert.

Sally Zabriskie disturbs the bottom of the river to show that the waste has settled under the dirt of the Animas River on August 12, 2015 at Santa Rita Park.

People get their first look at the Gold King Mine wastewater that flowed into the Animas River August 7, 2015 at the 32nd Bridge. Over a million gallons of mine wastewater has made it's way into the Animas River closing the river and put the city of Durango on alert.

Raft guide Brendan Grady takes a quick call after cleaning up the yard sale August 8, 2015 at Mild and Wild. Grady would be busy with the other 37 guides handling over 100 to 200 people taking trips in rafts daily, but with the spill all business has been halted with the exception of the Jeep Tours.Over a million gallons of mine wastewater from the Gold King Mine in Silverton has made it's way into the Animas River closing the river and put the city of Durango on alert.

Water flows through Cement Creek carrying some of the color of the dirt from the construction of a fifth retention pond on August 13, 2015 at Gladstone townsite which is the entry way into the mines. Members of the EPA, Environmental Restoration, Weston Solutions and the U.S. Coast Guard are working on cleaning up the water in the four retention ponds and helping with the creation of the fifth.

Stephanie Schuler, right, and Steve McClung, center, of Colorado Parks and Wildlife, and Mike Japhet, left check on cages with Rainbow trout fingerlings on Friday Aug. 7, 2015, on the Animas River in Durango, Colorado.

A sign alerting people of the Animas River's closure on August 12, 2015 at Baker's Bridge.

Colorado Gov. John Hickenlooper drinks water straight from the Animas River in Durango, Colorado, to get an update about the blowout from Gold King Mine on Tuesday, Aug. 11, 2015. The water was treated with an iodine tablet before he drank it to kill any giardia.

Cindy Arnold Humiston and Sally Zabriskie check the water in the Animas River to see if waste has settled at the bottom, days after the Gold King Mine spill, at Santa Rita Park in Durango on Aug. 12, 2015. (Photo By Brent Lewis/The Denver Post)

A dead fish lies at the bottom of the Animas River on August 12, 2015 at Santa Rita Park. "The river is returning to pre-event conditions," said EPA Administrator Gina McCarthy during a press conference in the afternoon. The Animas River is entering its sixth day of being closed to recreational use after the Gold King Mine spilled over three million gallons of wastewater into the river.

The yellow color that dominated the Animas River right after the spill turned a greenish color on by August 11, 2015.