CHLORATE/CHLORITE
        What is Chlorate/Chlorite? Chlorate and chlorite are inorganic compounds that form during the degradation of sodium hypochlorite (chlorine). They also are formed during the generation of chlorine dioxide, an alternative disinfectant to chlorine.

        What are the Health Effects of Chlorate/Chlorite? Exposure to chlorate and chlorite have both been shown to have adverse effects on the blood. Chlorate has additional health effects including abdominal pain, diarrhea, coma, and at high enough levels, will cause death. Further research needs to be conducted to determine the mutagenic and carcinogenic potential of chlorate and chlorite.

        How may I be Exposed to Chlorate/Chlorite? Chlorate and chlorite are found in disinfected drinking supplies where either sodium hypochlorite or chlorine dioxide are used as the method of disinfection. The levels vary considerably depending on water quality, the concentration of sodium hypochlorite, and the method used to form chlorine dioxide.

        Are the Levels of Chlorate/Chlorite in Drinking Water Dangerous to my Health? The results of toxicity tests suggest that safe levels of chlorate and chlorite in water for adults are 24 mg/L for each of them. Measurements of the levels found in water disinfected with chlorine dioxide indicate that higher levels may be found. No regulatory limits currently exist for chlorate or chlorite, but both may be regulated within the next 5 years.




Source: http://www.ci.sf.ca.us/puc/wqfs/tocsec4.htm