Monitoring Our Water Resources... Established in 2001, Hydrologic Data Collection (HDC) is a highly skilled and knowledgeable team of Hydrologists, Chemists, Biologists and Professional Geologists. Our staff has over 350 combined years of USGS water resource monitoring experience, plus more than 50 additional years of environmental monitoring work conducted within the private sector. With offices in Florida and Virginia, we conduct hydrologic monitoring throughout the Southeast and mid-Atlantic United States. We collect and deliver the highest quality data for your surface water, groundwater, water quality, and meteorological monitoring projects. Our expert team of professionals can operate independently as your water resource monitoring staff, or help support and supplement your existing team for short or long-term projects of any size and scope. We provide our services to city, county, state and federal governments; regional consortiums and organizations; and private firms. Our structure and unmatched experience in water resource monitoring allows us to provide accurate data to you, with quick delivery, while reducing your overall project costs.