New research from Bangladesh shows that heavy municipal pumping creates pathways for young organic carbon to leak into deep aquifers. This process disrupts ancient geological seals and allows surface contaminants to reach depths previously thought to be safe. This downward movement of carbon fuels microbes that release trapped arsenic into the water supply. The findings suggest that deep wells in delta regions worldwide, including California and the Mekong Delta, may face similar toxicity risks due to overpumping.
