Seven of eight test holes drilled in Glacier National Park derive water from the Quaternary alluvial or glacial deposits. The eighth test hole was dry. Aquifer tests indicated that production wells at the seven sites will yield enough water for domestic or campground uses. Estimated maximum pumping rates range from 4 to 50 gallons per minute (0.2 or 3.2 liters per second). The water is of excellent chemical quality and generally the major dissolved constituents are calcium and bicarbonate.