Activated Alumina Columns
Granular Ferric Hydroxide is in the right column
Antimony remains a troubling and increasingly difficult metal to remove from
our water. At the March 2006 board meeting of the Division of Drinking Water
we were granted a two year variance from EPA regulations. This
variance will expire in the year 2008 and to date we have conducted eighteen
pilot process studies obtaining either unacceptable results or
removal of the metal at a cost so high as to be fiscally irresponsible to
our consumers. We remain committed to solving this problem and advise you
to check in for the latest update.
Granular Ferric Hydroxide remains the only treatment technique that has proven to remove Antimony at a cost small enough to warrant further research. We also have begun a one year study to ascertain whether it may be feasible to blend and average sources to comply with the MCL. Preliminary test results are encouraging and we will update with more information as it becomes available.
The EPA, having recommended not to revise the Antimony MCL in it's six year review of drinking water standards, has just concluded a public comment period where we have submitted our thoughts and concerns regarding the toxicity of Antimony and the effects and costs associated with a full scale treatment facility. Salt Lake County Service Area #3 and the Town of Alta anxiously await news as to the comments submitted by us and on our behalf.
The lack of toxicological studies on the effects of Antimony in Drinking Water remain a concern and we recently were informed of a California study that suggests a Maximum Contaminant Level Goal of 20 parts per billion should be instituted.
little data regarding long term health effects and there are a few people
of the opinion that it actually helps to promote longevity.
California Study suggests a MCL 3.5 times higher than the current level