A recent news story suggested pregnant women should avoid exposure to trihalomethanes in tap wateris this a concern?
There isnt a simple answer until more research is available. Trihalomethanes (THMs) are formed as a by-product of disinfection when chlorine, used to control disease-causing contaminants in drinking water, reacts with naturally occurring organic matter in the source water. In one new study, pregnant women who drank five or more glasses of tap water at THM levels of 75 parts per billion or higher were found to have a higher risk of miscarriage. The California Department of Health Services conducted the study, and says their results need to be replicated before specific health recommendations can be made. Pregnant women who have questions should consult their physician. EVMWDs average for Total Trihalomethanes is below the state and federal MCL of 100 ppb, though sample ranges can vary above and below this limit. EVMWD has reduced THM levels through treatment plant improvements and is studying disinfection alternatives, such as ozone to further reduce THM levels.
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