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NEWS ALERT SERVICE!
Chlorate Action Level Reaffirmed by California Department of Health Services (CDHS)
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An action level for chlorate in
drinking water of 200 micrograms per liter (ppb) has
been posted on the CDHS
Action level website.
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The action level is based upon a
new evaluation of chlorate by the California Office
of Environmental Health Hazard Assessment (OEHHA),
the risk assessment entity for the State. The
risk assessment is contained in a January 7 (misstated as January 11 on the website)
memorandum. Action levels are health-based,
nonenforceable advisory levels.
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The chlorate action level could
affect decisions by California water utilities
considering chlorine dioxide treatment.
Chapter 4 of USEPA's 1999 Alternative
Disinfectants and Oxidants Guidance Manual (PDF file, 346 pages)
provides information on chlorine dioxide as a
disinfectant and its byproduct of chlorate.
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