Three radioactive contaminants, or radionuclides, are currently regulated under this rule in Kansas: gross alpha, combined uranium mass, and combined radium (radium -226 + radium -228). Source waters can be contaminated with radioactive materials by the natural decay of uranium in rocks and soil, and high levels of radiation in drinking water may lead to increased cancer risk and kidney toxicity. The Radionuclides Rule applies to community water systems only and monitoring requirements are independent of water system size or source water type. For detailed information regarding this rule, please see below for a copy of the Radionuclides Rule Survival Guide. This guide provides an overview of the rule, lists the maximum contaminant level for each radionuclide, and outlines monitoring requirements.