January 17, 2002 -- NEWS ALERT SERVICE
safedrinkingwater.com NEWS -- the premier newsletter for the drinking water quality industry.


Chlorate Action Level Reaffirmed by California Department of Health Services (CDHS)

  • An action level for chlorate in drinking water of 200 micrograms per liter (ppb) has been posted on the CDHS Action level website.
  • 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.
  • 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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