Bannock County Groundwater

Storm Water

Storm water pollution, also a potential threat to our drinking water, occurs when pollutants are poured directly into storm drains and when water flowing over streets, parking lots and yards picks up contaminants such as motor oil, deicing chemicals, lawn care products, and other chemicals. Everything that flows into the storm drain system goes directly into the Portneuf River, ultimately American Falls Reservoir and the Snake River. Polluted storm water that collects in land swales or depressions percolates into groundwater.

In the southern part of the valley, deicing chemicals have been detected in groundwater from road salting operations.

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