Arsenic primarily gets into well water from the natural erosion of rocks underground and from human-related activities.
Understanding Arsenic Sources in Well Water
Arsenic is a naturally occurring element found in the earth's crust. While it exists naturally, human activities can also introduce it into the environment. When it comes to private well water, understanding how arsenic contaminates the groundwater you tap into is crucial.
Natural Sources: Rock Erosion
The most common way arsenic enters groundwater is through geologic processes. As water flows through soil and rock formations beneath the ground, it can dissolve naturally occurring minerals. If these rocks contain arsenic, the element can be released into the groundwater. This natural erosion of rocks underground is a primary pathway for arsenic to reach wells, particularly in areas with specific types of geology.
Human-Caused Sources: Industrial and Agricultural Activities
Beyond natural processes, human activities can significantly contribute to arsenic contamination in groundwater. These activities often release arsenic into the soil or water, which can then seep down into the aquifer supplying private wells.
Key human-related sources include:
- Mining and smelting operations: These industrial processes can release arsenic into the environment.
- Coal-fired power plants: Burning coal can release arsenic-containing ash, which can affect nearby soil and water.
- Historical use of arsenic containing pesticides: Arsenic compounds were once widely used in pesticides for agriculture and pest control. Residues from these historical applications can remain in the soil and leach into groundwater over time.
Therefore, arsenic in well water can stem from either the natural geological makeup of the area or from pollution related to past or present industrial and agricultural practices.
