The Demonstration of Direct Potable Water Reuse

The $30 million Denver Direct Potable Water Reuse Demonstration Project evaluated the feasibility of converting wastewater to drinking water to augment Denver's water supply. The main testing facility for this study processed one million gallons per day and was described as "the world's most complex water treatment plant." To establish water safety, a comprehensive testing program analyzed every known contaminant. As an ultimate test of the water safety the Project included a lifetime whole-animal health effects study, normally conducted to assess substance carcinogenicity or before approving new pharmaceuticals for use, to evaluate the possible effects from drinking recycled water long-term. The results of these evaluations concluded that reusing wastewater as a drinking water source was both economical and safe when compared to Denver's high quality drinking water and all recognized drinking water health standards.