UC Irvine perchlorate clarification

[Lenny Siegel <lsiegel@cpeo.org>]

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The Urban Water Research Center at the University of California, Irvine
has added the following information to the web page announcing the
release of its report, "Perchlorate in Drinking Water: A Science and
Policy Review":

"NOTE: A number of organizations and news media outlets have received a
press release from the Council on Water Quality. It is important for
anyone receiving such a release to know that the excerpts extracted by
the Council from this report are self-serving to the Council's own
viewpoint and do not reflect the true content of the report. Relevant
quotes from the perchlorate report that we would select are:

"Although the benefits of reducing concentrations of perchlorate below
250 [micro]g/L are even more difficult to define, additional issues of
concern suggest that further reductions are prudent. An estimation of
the health benefits from reducing exposure to perchlorate below the
lowest dose utilized in the study by Greer and colleagues (2002)
requires a serious examination of how representative the study
participants are compared to the population consuming drinking water as
a whole. In addition, it is necessary to consider the extent to which
water consumption per unit body weight might vary in the population,
(e.g., bottle-fed infants), and whether other environmental, (e.g.,
living and working in desert environments), or lifestyle differences,
(e.g., working outdoors in hot climates), may render some part of the
population at greater risk than would be otherwise estimated by
calculation. Unfortunately, data are lacking that allow precise
evaluations of other factors that would affect the sensitivity of
at-risk individuals in a population. One concern is that pregnant women,
or perhaps a subset of pregnant women, may have less thyroid ?iodine
reserve? than was exhibited by the study populations in the Greer et al.
(2002) and Lawrence et al. (2000) studies.

"...These last three paragraphs emphasize the need for adopting a
conservative value for the perchlorate MCL even though direct benefits
cannot be demonstrated at this time.

"From Pg. 4, Executive Summary "Perchlorate in Drinking Water: A Science
and Policy Review" (2004)"

See http://www.urbanwater.uci.edu/

-- 


Lenny Siegel
Director, Center for Public Environmental Oversight
c/o PSC, 278-A Hope St., Mountain View, CA 94041
Voice: 650/961-8918 or 650/969-1545
Fax: 650/961-8918
<lsiegel@cpeo.org>
http://www.cpeo.org

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