Recycled wastewater is not only as safe to drink as conventional potable water, it may even be less toxic than many sources of water we already drink daily, Stanford University engineers have discovered. … The engineers found that, after treatment, potable reuse water is cleaner than conventional drinking water sourced from pristine-looking rivers. In most rivers, someone upstream is dumping in their wastewater with much less treatment than occurs in potable reuse systems. Conventional wastewater treatment plants just aren’t equipped to deep clean. This leaves many organic contaminants, such as chemicals from shampoos and medicines, floating down river and straight into a drinking water plant.