Irvine Desalter Project

Irvine Desalter Project

IDP 098A2779 x725A diversified water supply is a reliable water supply.  In the late 1980s, it was discovered that portions of the groundwater beneath Irvine has high salts levels because of the natural geology of the area and the history of agricultural use. The Irvine Desalter Project is designed to clean the elevated levels of salt in this previously untapped local groundwater thus adding to IRWD’s drinking water supply.

The Irvine Desalter Project consists of five wells located near the I-5 Freeway in Irvine.   Salty water is pumped from these wells and sent to the IDP treatment facility. The treatment process uses reverse osmosis, decarbonation and disinfection to make the water suitable for drinking purposes.  The purified water provides 5,100 acre feet or 1.6 billion gallons of drinking water, enough for 50,000 people, per year.

The IDP provides a local supply of water, ensuring a reliable source of water during drought conditions and for future generations.

Desalter Fact Sheet

Latest News

2018 Poster Contest FinalistsAbout 400 students entered the Water Awareness Poster Contest. Ten students have been recognized as finalists. Their posters move forward for a chance to be featured in the 2019 Water Awareness Poster Calendar published by the Metropolitan Water District of...
Ready, Set, QuakeCalifornia is earthquake country and you always want to be ready. IRWD suggests you enroll in the CodeRED® Emergency Alert System to receive updated information in any emergency. Just log on to and click “Emergency & CodeRED” in the...
Money-Saving Tesla Batteries Arrive at IRWD’s Water Recycling PlantA caravan of 18-wheelers and large hoisting cranes completed delivery on Tuesday of 75 high-efficiency Tesla batteries to the Michelson Water Recycling Plant, where they will be installed as part of Irvine Ranch Water District’s money-saving Energy Storage Program. For those...