U.S. Water Reservoirs are Shrinking and Becoming Less Reliable, according to New Research

A recent study published in the journal Geophysical Research Letters found that major water reservoirs across the continental U.S. are facing increased periods of low storage that are longer, more severe, and more variable compared to several decades ago. To help with this issue, utilities are encouraged to review EPA’s resilience resources for guidance on managing water scarcity.

The study concluded that reservoirs are less reliable and more vulnerable to climate change than they used to be, largely due to the fact most were built between 1930 and 1970 when climate resilience was not built into the process. However, with natural water storage sources, such as snowpack, rivers, and groundwater growing scarcer due to impacts from climate change, U.S. communities are more dependent on reservoirs than ever before.

With reservoirs in the central and western U.S. experiencing the most severe changes, members are encouraged to consider examining the study for the researchers’ conclusions about their respective region. Furthermore, members are encouraged to review whether their organization has appropriate plans in place for if and when a critical reservoir fails due to drought or another contingency. EPA has resources for both Drought Response and Recovery for Water Utilities and Emergency Drinking Water Supply Guidance, which can help utilities with their initial planning efforts. Read more at the American Geophysical Union or access the full study here.