Water levels in wells on the Paria Plateau range from 515 feet to 1,500 feet below land surface. In the Wahweap area, groundwater levels have responded to the filling of Lake Powell. Groundwater development has been relatively small. The N-aquifer, composed of Navajo Sandstone, Kayenta Formation, and Moenave Formation, is the primary aquifer in the area. Most wells are from 620 to 1,500 feet deep and yield from 30 to 1,400 gallons per minute for domestic and public supply.
Water quality varies across the basin.
In the Paria Plateau, water samples contain less than 300 milligrams per liter of dissolved solids. In the Wahweap area, dissolved solids concentrations generally exceed the recommended secondary maximum contaminant level of 500 milligrams per liter.