That's Right !!

4. Which of the following may be carcinogens (cause cancer)?

1. Trihalomethanes
2. Haloacetic acids
3. Bromate
4. Chlorite
5. All of the above
6. a, b, & c
7. None of the above

F - Research studies have shown that bromate, haloacetic acids, and trihalomethanes are carcinogenic in laboratory animals. This is why the EPA regulates how much of these byproducts can be in drinking water (80 part per billion [ppb] for trihalomethanes, 60 ppb for haloacetic acids, and 10 ppb for bromate).

Chlorite and certain types of haloacetic acids and trihalomethanes (there are many different kinds) have been linked to some reproductive or developmental problems in laboratory animals. Chlorite is regulated at 1.0 parts per million (ppm).

http://www.epa.gov/enviro/html/icr/gloss_dbp.html#dbp Federal Register, Dec. 16, 1998. Part IV, 40 CFR parts 9, 141, 142. National Primary Drinking Water Regulations: Disinfectants and Disinfection Byproducts; Final Rule. http://www.epa.gov/safewater/mdbp/dbpfr.pdf

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