Environmental, Health and Economic Impacts of Road Salt environmental impact New Hampshire Department of Environmental Services toxic for wildlife Environmental, Health and Economic Impacts of Road Salt Environmental, Health and Economic Impacts of Road Salt impacts water supply degradation from roadway runoff caused extensive ground and surface water contamination impacts toxic for wildlife Environmental, Health and Economic Impacts of Road Salt erode soil particularly toxic for wildlife, plant life, pets and humans many negative effects road salt Chloride Environmental, Health and Economic Impacts of Road Salt four times the sodium chloride four times the sodium chloride