Aquifer Storage & Recovery

Common to Southern California, Aquifer Storage and Recovery (ASR) is a process where water is injected to a groundwater aquifer using a well, then recovered through pumping water out of the aquifer. ASR wells are used to store large amounts of water for future use.

After injecting water into the aquifer from December 2005 to May 2006, the City of Roseville began extracting drinking water from the well and began delivering it to Roseville water customers beginning in July 2007. This extraction was done in accordance with the regulatory requirements placed on the city’s use permit.

In 2015, Environmental Utilities received Project of the Year from the American Public Works Association’s (APWA) Sacramento Chapter.

The future of ASR in Roseville
The data collected during the test program will help the city design the permanent ASR Program. Implementation of this program is consistent with the long term strategy laid out in the city's Urban Water Management Plan, with reliance on groundwater supplies when surface water supplies are not available. It is anticipated that ASR can help preserve the integrity of the groundwater basin.

The long term goal of Roseville's ASR Program is to implement a full-scale project of up to 12 wells, capable of injecting 10,000 acre-feet of water per year.

Once the program is fully implemented, the ASR wells would help meet operational needs to ensure that water reliability of the system is maintained. This could mean operation of the well even during wet or normal years. In dry years or in a drought situation, the City would employ the well to ensure that the city's water supply is reliable.

A fully implemented ASR program will allow Roseville to prepare for the future by banking water during times of plenty and extracting water during drought conditions. By providing a "water savings account,¨ Roseville is literally saving for a non-rainy day.