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Long Term Hydrological (Radiological) Site Monitoring Data

Published by U.S. EPA Office of Air and Radiation (OAR) - Office of Radiation and Indoor Air (ORIA) | U.S. Environmental Protection Agency | Metadata Last Checked: July 31, 2025 | Last Modified: 2014-01-15
Quality Data Asset includes all current and historical data on the quality of water with regard to the presence of water pollutants of all kinds regulated by the Clean Water Act. Under the new Interagency Agreement with the Department of Energy (DOE), the Radiation & Indoor Environments National Laboratory (R&IE), Office of Radiation and Indoor Air (ORIA), EPA, located in Las Vegas, NV, conducts a Long-Term Hydrological Monitoring Program (LTHMP) providing laboratory sampling/analysis and Quality Assurance and Control to measure radioactivity concentrations in the water sources near the sites of former underground nuclear explosions. The results of the LTHMP provide assurance that radioactive material from the tests have not migrated into water supplies.

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