The number of public drinking water systems in Vermont with elevated levels of disinfection

The number of public drinking water systems in Vermont with elevated levels of disinfection by-products has notably increased in recent years and scientists link the trend to climate change. Extreme flooding and warmer winters mean more organic matter is being washed into rivers and lakes. When chlorine is added to ensure drinking water is pathogen-free, it interacts with the organic material in a way that creates toxic chemicals. State health officials say most Vermonters have nothing to worry about — the risk comes only from long-term exposure. Still, these situations could affect many of the public drinking water systems that serve 60 percent of Vermonters.