The Biden administration is reversing a Trump administration rule that sought to loosen restrictions on water flow through showerheads. The Energy Department announced Friday in a document (pdf) that it will reinstate the definition of the word “showerhead” that was from 2013 during the Obama administration, in effect reversing the Trump administration’s rule on showerhead flow. The 2013 definition meant that for a given showerhead fixture—which could include multiple nozzles, such as in the case of rigid riser showers—no more than 2.5 gallons of water should flow out per minute (9.5 liters). A federal law in 1992 (pdf) required that showerheads couldn’t use more than 2.5 gallons of water per minute, but did not define whether a showerhead was an individual nozzle or the entire showerhead fixture. In December 2020, the Trump administration finalized a new definition for “showerhead” such that each nozzle would be able to have the maximum 2.5-gallon per-minute water flow, instead of …