WILTON - Wilton officials are concerned the road salt the state has been using this year is harmful to vehicles.

Wilton officials say they have seen an increase in corrosion on some of their trucks. They say they have not seen this problem in previous years.

The mixture that is used is known as magnesium chloride, which some believe may be toxic. The Wilton Fire Department says it has proof it’s toxic. The department also says it has spent thousands of dollars trying to clean up after it.

First Selectman Bill Brennan backs legislation that would require the state Department of Transportation to look into possible alternatives to magnesium chloride. State DOT Commissioner James Redeker says he's willing to look into whether the mixture may be at fault.

Wilton officials sent written testimony to the General Assembly's Transportation Committee, which held a hearing on the bill last week.