Analysis of water samples conducted in August of 1998 used a modified laboratory method which is able to reach down to 1 part per billion using Ion Chromatography. California currently has an interim health standard of 18 parts per billion. If results are above this level, water systems in California are required to remove that source from the drinking water system or to conduct public notification. California is able to do this since they have the legal authorities within their Department of Health. There are currently no cost effective treatment technologies that can remove perchlorate from the drinking water, groundwater or surface water.
Research is ongoing to find a cost effective treatment technology.
Risk studies on perchlorate and its effects on human health are underway, and a revised reference dose is anticipated to be completed by the US EPA by January of 1999. It is the goal of ADEQ to keep the communities in Arizona up to date on this emerging issue.