Northern Guam geospatial information server


This Northern Guam Lens Aquifer (NGLA) currently supplies drinking water for 80% of the population of Guam. Its immense importance to Guam was formally recognized in 1978 when U.S. Environmental Protection Agency designated the NGLA as Sole Source Aquifer. This term, originating in the Safe Drinking Water Act, means an aquifer which is the "sole or principal drinking water source for the area and which, if contaminated, would create a significant hazard to public health." For that reason, it is important that the general public in Guam is aware of NGLA's importance and its key characteristics.