Boron is a mineral found in soil and water. It enters drinking water through natural erosion and industrial/agricultural runoff. High levels may affect reproduction.

Boron naturally occurs in rocks and soil, but human activities increase its presence in water. Industrial processes like glass manufacturing and agricultural practices using boron-containing fertilizers contribute to elevated levels. While essential for plants, excessive boron can be harmful to humans. Water treatment methods such as reverse osmosis can effectively remove boron. The EPA has set a health advisory level of 5 mg/L, though regulations vary globally. Regular testing is crucial for maintaining safe drinking water.