Potassium is an essential mineral naturally present in water. It can increase from fertilizer runoff or water treatment. High levels may affect heart function in some people.

Potassium occurs naturally in water sources due to mineral deposits and rock weathering. While essential for bodily functions, elevated levels can result from agricultural runoff or certain water treatment processes. Potassium is typically measured in parts per million (ppm) in drinking water. The EPA doesn't regulate potassium levels, as they're generally not a health concern for most people. However, individuals with kidney problems or those taking certain medications may need to monitor their potassium intake, including from water sources.