When deep wells were dug for the irrigation of crops, naturally embedded arsenic in the earth was brought up in the water, and it eventually seeped into wells used for drinking.
Kad labības lauku apūdeņošanai tika izraktas dziļas akas, zemē esošais arsēns tika pacelts augšup līdz ar ūdeni, un beigās tas nokļuva akās, no kurām ņem ūdeni dzeršanai.