The San Francisco Public Utilities Commission has announced that construction is underway on groundwater wells aimed at improving the water supply during a drought or an earthquake. The US$113 million Regional Groundwater Storage and Recovery Project creates an underground reservoir in the South Westside Groundwater Basin. During wet years, surface water will be used instead of groundwater, creating a water savings account. Construction for this project is underway on 13 well facilities including chemical treatment equipment, tanks, pumping systems, and associated pipelines that will work together to ensure delivery of water to customers when they need it most. Once complete, this project will be able to provide 27 million litres of water per day to customers, which could serve up to 24,000 households after an earthquake or during a drought.