Skip to main content
King County logo

Treatment of arsenic found in drinking water is complex and it cannot be removed by simply boiling water. While methods for removing arsenic from water are available, the effectiveness of each method depends on the chemistry of the water being treated.

Groundwater chemistry varies across King County, therefore, the effectiveness of arsenic treatment methods can also vary. It is recommended to test your well water for the presence of arsenic to ensure that it is below the maximum contaminant level of 10 parts per billion (ppb). Ingestion of higher levels of arsenic in drinking water can be detrimental to health.