How can arsenic get into a drinking water supply?

Natural Sources: Arsenic can occur naturally in groundwater and rocks in some areas. When water dissolves these minerals, the arsenic can be released and contaminate the water supply. This is particularly common in certain geological formations, such as sedimentary rocks or volcanic regions.

Industrial Activities: Arsenic can also enter water sources through industrial activities, such as mining, metal processing, and the use of certain chemicals in agriculture. Improper disposal or accidental spills from industrial sites can leach arsenic into groundwater and surface water.

Agricultural practices: Arsenic-containing pesticides and herbicides can be used in agriculture. Runoff from fields treated with arsenic-containing pesticides and herbicides can contaminate surface water and groundwater.

Waste Disposal: Poorly managed waste disposal sites, including landfills and tailing ponds from mining operations, can also release arsenic into the environment and potentially contaminate water supplies.

Runoff: Arsenic-containing sediments from mining and industrial activities can be transported by water runoff during heavy rains or floods, contaminating nearby surface water sources.

Leaking Pipes and Fixtures: In older buildings, water pipes and fixtures containing arsenic may corrode and release arsenic into the water supply. This is particularly common in areas where the water supply is acidic.