Occoquan Reservoir (IMAGE) Virginia Tech Caption The Occoquan Reservoir is an important source of water supply to Fairfax Water, a water utility serving about 2 million people in Northern Virginia and the home of Virginia Tech's Occoquan Watershed Monitoring Lab. Photo courtesy of Stanley Grant. Credit Virginia Tech Usage Restrictions Credit Virginia Tech License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.