Less than a week after I posted my blog post about the environmental and health problems associated with road salt, the Boston Globe published an article about de-icing alternatives some Massachusetts communities are turning to. Boston has received almost 50 inches of snow this winter compared to a total of 17 inches on average around this time. We can only assume that it means we’re using record amounts of salt to combat all this snow. While it is difficult to say if the increased snowfall we’re seeing is directly related to climate change, increased temperatures tend to increase evaporation thus resulting in increased precipitation.  (In the Northeast, there has been a 5 to 10% increase in annual average precipitation since 1900.) More generally speaking, scientists are increasingly concerned about the link between global warming and anomalous winter weather (such as the bizarre snowstorms seen recently in the South). As such, it is encouraging to hear that towns are looking to more environmentally friendly alternatives to deal with our new weather conditions as the planet continues to warm.

Besides rock salt (sodium chloride), calcium chloride and magnesium chloride can be used in colder temperatures but unfortunately, they are significantly more expensive than the traditional rock salt. Instead a growing number of Massachusetts communities are returning to an age-old solution: brine. The mixture is a combination of rock salt and water. Applying brine before snow falls and ice forms on the roadway (known as “anti-icing”) can prevent snow and ice from sticking to roads. Unlike plain old rock salt, this stuff doesn’t bounce or get blown off the roads like we’ve all seen. As such it dramatically reduces the amount of salt used and the time it takes to remove snow and ice from the roads in turn saving towns money. A study done in Oregon and Washington state showed that anti-icing can decrease costs by more than 50% compared to conventional de-icing. And it reduces the amount of salt that gets into our drinking water and the negative impacts on the environment.

This yet again reinforces the idea that solutions that are good for the environment are often also good for people and the economy.

It’s difficult to imagine a day like today in Boston without the aid of salt to make our roads safe to use. For those of us in the snowier parts of the country, road salt is a necessary and accepted part of our winter. It’s cheap, effective and it allows commuters, motorists and emergency vehicles to safely reach their destinations in harsh conditions. According to the Salt Institute, Americans used 22 million tons of road salt in 2008. In a different study by the National Research Council, Massachusetts tops the list of of states with the highest road salt-use at, 19.94 tons per lane-mile each year, surpassing even New York, with 16.6 tons per lane-mile. Under MassDOT salt policy, salt or sodium chloride is applied at 240 pounds per lane-mile. In other words, trucks in Massachusetts are dumping more than a ton of salt every 10 lane-miles in a single application! Salt does not evaporate or otherwise get removed, so one has to ask: what is the fate of all this salt that is dumped on our roads?

Unfortunately, most of it is washed off of roadways by rain runoff and snow melt and enters our rivers and streams or percolates through the soil into our drinking water supplies. That’s the situation that Cambridge, MA has been combating for years. This densely-populated city gets its water from two reservoirs, both located next to Route 128, making it particularly susceptible to salt contamination. Another town suffering from the same issue is Boxford, MA. The town launched a suit against the state highway department, MassHighway, to close its salt storage shed, contending that it was responsible for contaminating at least 30 local wells. Aside from the ecological damage of excess salt, there are also health and financial burdens associated with high salt levels in public and private water supplies. High salt levels can result in skin and eye irritation and pose a danger for individuals with sodium-restricted diets, according to the New England Interstate Water Pollution Control Commission.

MassHighway is already under court order to manage stormwater runoff after CLF’s successful suit in 2008. Hopefully this effort will divert some of the salt from our waters and, in turn, lead to better health for both the environment and the MA residents who live in it.