Since the volume of anti-icing products required to manage our Pacific Northwest winters is relatively low, environmental concerns are considered minimal.
The Washington State Transportation Center and Washington State University conducted a thorough scientific study of the effects of chloride anti-icing products on the environment. This study was conducted on a stretch of SR 97 near Leavenworth where high volumes of chloride products were used near a fish bearing stream. The results indicated that deicing activities along SR 97 had no measurable negative impact on Peshastin Creek. The full report can be viewed at: http://www.wsdot.wa.gov/research/reports/fullreports/500.1.pdf