Water Recycling: At Home and Abroad

The Central Coast is not alone in leading water recycling and advanced treatment technologies. These processes have been tried and tested all over the world.  Follow along for a tour of other exciting water recycling projects in California, the United States, and the World.


  • Groundwater Replenishment System (GWRS): The GWPS is a joint effort between Orange County Water District and the Orange Count Sanitation District. Currently, the GWRS is the world’s largest advanced water purification system for potable reuse. After advanced treatment, the GWRS injects about 1/3 of the recycled water into coastal injection wells to serve as a seawater intrusion barrier and pumps about 2/3 of the recycled water to recharge basins where it percolates through sand and gravel before it filters into the county’s groundwater basin.
  • West Basin Municipal Water District: West Basin’s water recycling program produces five types of “designer” waters to meet their customer’s specific needs. The five designer waters include irrigation water, groundwater replenishment water, high-pressure boiler feed water, low pressure boiler feed water, and cooling tower water.
  • Silicon Valley Advanced Water Purification Center: The Santa Clara Valley Water District developed the Silicon Valley Advanced Water Purification Center, which receives secondary treated effluent from the neighboring San Jose-Santa Clara Regional Wastewater Facility and runs the flows through advanced treatment.
  • Pure Water Monterey: The Pure Water Monterey project is a joint effort between the Monterey Peninsula Water Management District (MPWMD) and the Monterey Regional Water Pollution Control Agency (MRWPCA). The project involves sending urban stormwater runoff, Salinas agricultural wash water, secondary treated wastewater, and agricultural drainage water through the advanced treatment process and using the purified water for agricultural irrigation, regulated ocean discharge, and groundwater replenishment.
  • VenturaWaterPure: The VenturaWaterPure Project was developed by the City of Ventura and a team of students from the Bren School of Environmental Science & Management. VenturaWaterPure is a demonstration facility and includes pasteurization, ultrafiltration, reverse osmosis, and ultraviolet light/advanced oxidation as its advanced treatment process.
  • Pure Water San Diego: The Pure Water Project is a phased program led by the City of San Diego that will provide one-third of San Diego’s water supply by 2035. The program aims to use advanced treatment to clean recycled water to produced safe, high quality drinking water. The City constructed a one million gallon per day demonstration facility in 2011.

The United States

The World

  • Israel
  • Denmark
  • Australia
  • Singapore
  • Spain