During a primary treatment, large solids are removed. Tertiary treatment employs filtration to remove any remaining solids and uses a disinfectant, such as chlorine, to destroy bacteria, viruses and other pathogens. For many reuse applications, an advanced treatment process, such as filtration or reverse osmosis, is required. 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.