Perchlorate in the Pacific Southwest
Perchlorate contamination within the United States is most prevalent in the Pacific Southwest. This site provides information about:
- state-issued perchlorate advisory levels,
- specific sites contaminated with perchlorate, and
- links to information provided by Arizona, California and Nevada (including the Colorado River watershed), which are the three states in Region 9 where perchlorate releases have been detected.
This thumbnail clicks to a map showing the locations of all perchlorate detections in Region 9 reported to EPA as of September, 2004.
Region 9's Response to Perchlorate Contamination
A number of EPA's nationally recognized perchlorate experts work out of the Pacific Southwest regional office (the Region 9 office) and have played leadership roles in sorting out the technical, legal and regulatory issues surrounding perchlorate.
- Perchlorate Update Factsheet, 2002
- Perchlorate Update Factsheet, 1999
- Perchlorate Cleanup activities in Region 9, 2005
- Perchlorate Cleanup activities in Region 9, 2004
- Perchlorate Cleanup activities in Region 9, 2003
- Nevada (Kerr-McGee Chemical Company)
To learn more about perchlorate, review the December 2004 presentation (links below) with information about perchlorate occurrence, health effects and regulatory status.