These processes duplicate nature's own purifying actions. California is a pioneer in the field of water recycling. Successful projects exist for practically any type of reuse imaginable. Landscape irrigation has been practiced for more than 50 years, and recreational uses and industrial recycling are also common. There are many examples of recycled water being used to support and enhance aquatic habitat, fish and wildlife.
Standard practice requires separate pipes for drinking water and recycled water.
Guidelines set by the Department of Health Services ensure that recycled water facilities are clearly distinguishable from other water facilities to avoid mixing of supplies. Do Not Drink. Indirect potable reuse occurs in many communities as recycled water from an upstream community rejoins a river and becomes part of a downstream water supply. In addition, several milestone groundwater recharge projects in Southern California have an excellent track record of success, with over 30 years of history and no outbreaks of water-borne disease linked to recycled water. Through groundwater recharge, recycled water is percolated into groundwater basins, mixes with naturally-occurring groundwater, and eventually is pumped out for domestic use.