Granby dials back fluoride dosing in response to new federal guidelines

Calcium fluoride
Calcium fluoride

From the Sky-Hi Daily News (Lance Maggart):

The PHS has reduced the optimum recommended amount of fluoride in municipal water systems to a maximum of 0.7 milligrams per liter. The previous recommended range, from 0.7 to 1.2 milligrams, was changed this year for the first time since 1962.

Fluoride levels in Granby’s water supply vary depending on whether the water comes from the North Service Area or the South Service Area, two separate water systems providing public water service to community residents. Historically the fluoride levels in the two different service areas have been 1.1 milligrams per liter.

Following the new recommendations the North Service Area began reducing the amount of fluoride added to the water system. Granby Town Manager Wally Baird explained the levels in the North Service Area are already down to 0.9 milligrams per liter, and the Town plans to continue to reduce North Service Area down to the recommended level of 0.7 milligrams.

The South Service Area’s fluoride levels will remain at 1.1 milligrams per liter. No fluoride is added to the water in the South Service Area, explained Superintendent of the South Service Area Doug Bellatty. Instead the water levels in the South Service Area are naturally occurring.

Bellatty explained why the fluoride levels in the South Service Area will remain the same.

“The only process available to communities to lower the naturally occurring levels is through reverse osmosis,” he said, “which is extremely expensive and energy consuming.”

Bellatty pointed out that while the recommendation levels have been dropped, the Maximum Contaminant Level (MCL) — the highest level of a contaminant allowed in drinking water — for fluoride is 4 milligrams per liter.

More water treatment coverage here.

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