The Alvarado water treatment plant, which supplies drinking water to USD and central San Diego, is currently in the process of switching its disinfection system from chlorine to ozone. The new system is currently being tested, and the switchover will occur in the next several weeks. (See link for details.) Of course, since ozone doesn't persist in the water, a small amount of chlorine will still be added to provide residual disinfection for the water as it flows through the system. The results should be less organics, less trihalomethanes, and better tasting water. However, according to our text, if bromine or bromide is present in the water supply, different carcinogens such as formaldehyde and bromate ions (instead of trihalomethanes) could be produced.
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