The U.S. Environmental Protection Agency (EPA) is reevaluating its earlier decision not to regulate perchlorate in drinking water, and currently is seeking advice from the National Academy of Sciences (NAS) before making a final determination on whether or not to limit the amount of the rocket fuel ingredient permissible in water supplies.
the agency has issued an interim health advisory of 15 parts per billion (ppb).
EPA expects to issue a final health advisory concurrent with the final
regulatory determination for perchlorate.
is a naturally occurring and manmade chemical that can affect the functioning
of the thyroid gland at sufficiently high doses. It is manufactured and used as
an industrial chemical, and can be found in rocket propellant, explosives,
fireworks and road flares.
Oct. 10, 2008, the agency issued a preliminary regulatory determination for
public comment in the Federal Register. The notice described the agency’s
decision that there is not a "meaningful opportunity for health risk
reduction" through a national drinking water regulation for perchlorate.
The agency received more than 32,000 comments on the notice.
considering public comments, as well as recommendations from EPA advisory
groups and offices, EPA is asking the NAS to evaluate its derivation of the
Health Reference Level of 15 ppb, the use of modeling to evaluate impacts on
infants and young children, and the implication of recent bio-monitoring
is replacing the existing preliminary remediation goal of 24.5 ppb with the
interim health advisory value of 15 ppb. This goal will be used as a
consideration when establishing cleanup levels for perchlorate at Superfund
More information on the
perchlorate health advisory, visit www.epa.gov/safewater/contaminants/unregulated/perchlorate.html