Climate change is also projected to impact groundwater-dependent ecosystems and groundwater quality negatively . Projected increase in precipitation intensity and storms can contaminate groundwater by mobilising contaminants such as chemical fertilisers, pesticides and antibiotics and leaching of human waste from pit latrines into groundwater . By 2050, environmentally critical streamflow is projected to be affected in 42-79% of the world's watersheds. The majority of these watersheds currently experience intensive groundwater use, and changes in critical streamflow are projected to negatively impact aquatic ecosystems . Using a global synthesis of 9404 data points from 32 countries across six continents, McDonough et al.  report increases in DOC concentrations in groundwater following projected changes in precipitation and temperature. For example, hotspots of high DOC concentration  are associated mainly with increased temperatures in the wettest quarter of the year in the southeastern USA under RCP8.5 scenarios.
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report