The massive increase to the salt content of soil located next to roads affects roadside vegetation; often killing the vegetation and impeding its ability to grow back.  Unfortunately, many invasive plants are well-adapted to high levels of salt, leading to a greater potential for invasive species to take over and spread along roadside communities. Researchers in Massachusetts found that road salt use directly aided the spread of invasive phragmites along the Kampoosa Bog in Stockbridge.

Many wild animals such as moose, deer, cattle, woodchucks, squirrels and mountain goats require essential elements such as sodium in the springtime for bone, muscle and other growth.  Salt deposits exacerbate roadside collisions as the wild salt-seekers are drawn from miles away to lick the mass salt deposits left near highways and roads during the spring.

People living in snowy climates are well away of the devastating effects salt has on their vehicles, perhaps not on what can occur within their own bodies.  Excess salt can contaminate ground and freshwater; water that we drink and use to prepare food.  Not all the salt can be filtered out of the water and can pose health risks to those who require sodium-reduced diets or those with hypertension.

High levels of chloride in water can corrode plumbing and leach harmful metals into drinking water, posing health risks, particularly for people using well water. Corroded water pipes lead to breaks which can cause disruption in service and even flooding.  Not to mention that the elevated chloride levels can also corrode appliances using water such as dishwashers and washing machines.

Sustainable alternatives are being implemented in both Canada and the United States.  Many Canadian municipalities are using a more environmentally friendly de-icing agents such as a mixture of beet juice and salt.  Beet juice works in the same was as road salt, but the beet juice stays on the road longer, so it is not only effective, but requires fewer applications.  In Wisconsin, cheese brine; an industrial byproduct from the dairy industry that is normally dumped as waste, is being combined with salt to create a unique deicer.

More and more people are experimenting with sustainable salt solutions and hopefully in the near future less salt will be used.

According to to Wisconsin Saltwise, an organization designed to educate Dane County residents and maintenance professionals about road salt safety, it takes one teaspoon of salt to permanently pollute five gallons of water to a level that is toxic for freshwater ecosystems. 

An average of 500 tons of salt a year is put into Lake Mendota during an average winter. Not intentionally of course, but the salt can wash into the lakes when met with rain.

Not only does salt degrade lake ecosystems, but it also diminishes the quality of drinking water.

Read about Madison’s action taken to limit is salt usage.

The city is concerned with the damaging effects of road salt.  It would ultimately get washed into storm drains which flow to a sewer treatment plant.  Will the salt corrode old metro-area pipes? It affects the roads, the steel in the bridges and the concrete and it affects your car.  And, the salt that stays on the roads will eventually get washed into the environment.

Minnesota is beginning to see some of the environmental effects of road salt use. In the Twin Cities metro area, the level of salt (chloride) in 39 surface waters now exceeds water quality standards.  An additional 38 surface waters are almost above the standard and many others remain untested.  Data shows that salt concentrations are continuing to increase in both surface waters and groundwater across the state.

The fact is that it only takes one teaspoon of road salt to permanently pollute 5 gallons of water. Once in the water, there is no way to remove the chloride. At high concentrations, chloride can harm fish, aquatic plant life, groundwater and drinking water supplies.

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