National Research Council report on potable reuse.

In 1998, the United States National Research Council prepared a report assessing the viability of potable reuse. The report concludes that planned indirect potable reuse is a viable application of reclaimed water but should be considered for implementation only after other alternative measures, such as development of new water sources, nonpotable reuse, and water conservation, have been evaluated and determined not to be economically or technically feasible. Although health-effects research has not indicated that there have been any adverse health effects resulting from drinking highly treated reclaimed water, those data are sparse. There are uncertainties associated with assessing the potential health risks of drinking reclaimed water. The report acknowledges that several issues remain unresolved regarding reclaimed water treatment and reliability, microbial and chemical constituents of concern, and water quality and health effects monitoring. Research needs include methods to detect emerging pathogens, identification and quantification of trace organic compounds, development of suitable in vivo toxicological methods, and evaluation of the effectiveness and reliability of multiple treatment barriers. The report also concludes that direct potable reuse is not a viable option to consider at this time.