In one study (Snyder 2008), a survey of plant effluent quality from a drinking water plant and an Advanced Wastewater Treatment plant was compared. The data shows that Atrazine, a pesticide, was found at levels of 76-1080 ng/L for the potable water plant, while they were less than 0.25 ng/L from the RO water reuse plant. This indicates the problem with these type of contaminants, they are not readily removed by the convention technology used in potable water treatment plants, and it shows that Advanced Wastewater Treatment plants can give the added level of protection through the use of RO.