There is no connection between the Berkeley Pit water and well water near Butte, Montana’s East Ridge. The water levels in the Berkeley Pit and the flooding underground mines are well below the lowest groundwater levels in the greater Butte Basin. The Berkeley Pit is the “sink” or lowest water-level point in the basin, and all groundwater near the Pit flows towards the sink. Water levels in alluvial aquifers (loose-sediment aquifers within the valley above the bedrock level) are generally several hundred feet or more above the Pit level, while water levels in the bedrock along the East Ridge and foothills south of Butte are a hundred or more feet above the Pit level. Water quality monitoring of bedrock wells surrounding the Pit continues to show that wells outside the area are not being impacted by rising Pit and mine water levels.

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