Monday, Jan 10 2011 5:50PM

Officials from the Department of Health and Human Services are recommending a reduction in the levels of fluoride allowed in drinking water in the U.S., saying that the current standards are too loose and may be causing health problems for many rural residents.

The current standards, set in 1962, set fluoride levels at 0.7 parts per million in warm areas and up to 1.2 parts per million in cooler climates, where residents' water intake may be lower. The proposal would change that recommended level to 0.7 for all areas.

"This decision is another signal to the public to take care when it comes to exposures to industrial chemicals," said Jane Houlihan, senior vice-president of the Environmental Working Group, a Washington-based nonprofit organization. "What is considered safe today won't necessarily be thought safe tomorrow."

The final authority for the rules rests with the Environmental Protection Agency, which would pass along new regulations to companies providing water system services and utilities across the country.

While fluoride in drinking water can help prevent tooth decay, a report from the National Academy of Sciences says in high levels it can also cause health issues, including fluorosis, a discoloration or pitting of the teeth. Long-term exposure to high levels may also increase the risk of broken bones.