NEWS ALERT SERVICE!
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.