Bethlehem

Town drinking water exceeded new Environmental Protection Agency maximum contamination levels for a group of chemical compounds that are often a byproduct of disinfecting water, town officials said.

Acceptable levels of trihalomethanes, which include chloroform, bromoform and chlorodifluoromethane, are 80 parts per billion, according to the EPA and state Department of Health.

Water sampled at Bethlehem's two water treatment facilities tested at an annual average of 84 and 89 parts per billion.

The town's failure to meet maximum contamination level standards is a result of recently changed EPA standards, not a change in town water quality.

"Nothing has changed in the water," Supervisor John Clarkson said.

Trihalomethanes are produced when drinking water is chlorinated during disinfection. The chlorine reacts with acids found in organic material in the water, such as decomposing tree leaves, and produces trihalomethanes. Levels of trihalomethanes in the water can vary significantly depending on such factors as temperature.

Town residents received a notice with their March water bills explaining the contamination and its possible risks. Some studies have shown that long-term exposure to water containing high levels of such compounds could result in increased health risks, including birth defects and miscarriages in pregnant women. Some trihalomathanes, such as chloroform, are potentially carcinogenic.

Clarkson stressed that the contamination is not a cause for concern.

Residents who are concerned about the situation can use carbon filters on home tap water as a precaution.

In anticipation of the regulatory changes, Public Works Director Erik Deyoe said the town has taken steps to address the issue. Capital improvements to the New Salem Water Treatment Plant, including an $800,000 new pipeline, are expected to be finished in June.

kbrown@timesunion.com • 518-454-5035 • @kristenvbrown