City Water Department: contaminant no huge risk

City of Watertown Water Department officials said Monday that high levels of a contaminant was found in the city’s water supply, but it is unlikely to cause harm to consumers.

WATERTOWN — City Water Department officials said Monday that high levels of a contaminant was found in the city’s water supply, but it is unlikely to cause harm to users.

The city collects water samples monthly from four locations. During the last calender year ending March 31, the amount of trihalomethanes in one of the locations reached 80.8 micrograms per liter, which exceeds the maximum contaminant level of 80 micrograms per liter. The annual average for one of the testing sites contained the high level of trihalomethanes, which is a byproduct of chlorine disinfectant used to treat drinking water of bacteria and viruses.

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