Why would the environmental protection agency have a regulation about dumping waste salts containing barium into waterways?

The Environmental Protection Agency (EPA) regulates the dumping of waste salts containing barium into waterways to protect aquatic ecosystems and public health. Barium can be toxic to marine life and can accumulate in the food chain, posing risks to both wildlife and humans who rely on these water sources. Additionally, preventing barium contamination helps ensure compliance with water quality standards and safeguards drinking water supplies. These regulations are part of broader efforts to mitigate pollution and preserve environmental integrity.