Featured Post from Villanova University

Application of Road Salt Can Have Widespread and Long-Lasting Impacts, Says Villanova’s Steven Goldsmith, PhD

Feb 13, 2025

5 min

Streaks of white that coat roads and cars. Powdery footprints smudged into floors. It’s the time of year when much of the United States relies on road salt to keep ice at bay and accepts the nuisances that come with it. But beyond the inconvenience, all that salt has potentially serious, long-term effects on the environment, human health and infrastructure.


Steven Goldsmith, PhD, an associate professor of Geography and the Environment at Villanova University, researches topics in watershed biogeochemistry and environmental health. A focus of his lab is the study of de-icing practices on water quality. Recently, Dr. Goldsmith shared insights from his work, exploring the widespread consequences of road salt and potential solutions to reduce its harm.


Villanova PR: You have led or participated in research focused on the environmental impacts of road salt application, often locally, but with much broader implications. What have some of those studies found?


Steve Goldsmith: In 2022, we published a paper showing that salt—sodium in particular—is seeping into Philadelphia's water supply, and it's timed with snow melts. We found that if you drank a glass of tap water during the peak period in the winter of 2018-19, your sodium intake would be six times what the Environmental Protection Agency (EPA) recommends within a glass of water for someone on a low-sodium diet. We are susceptible in this region because most of our water supply comes from rivers, and the rivers receive that salt runoff. Some of our findings indicate this is a chronic issue and not limited to winter months. All that contaminated shallow groundwater causes the concentration to rise year-round, even in the summer.


In a recent paper, we discuss the issue of salt that lands on the side of the road. When it does, it infiltrates into soil, and then it goes into shallow groundwater before entering our streams. Oftentimes when salt is applied to the road and you receive that initial precipitation, you are left with runoff with salinity near the concentration of sea water, which is very bad for freshwater organisms.


PR: Have those studies found other impacts beyond those created directly by sodium?


SG: It’s certainly not just a sodium issue—it's also a chloride issue. Chloride does have a negative impact on aquatic organisms, but it can also corrode drinking water infrastructure. If you have lead pipes in that infrastructure, that can lead to a range of human health issues. Even just to prevent those problems, applying chemicals to protect from the corrosion of pipes increases costs.


Perhaps the worst part is when road salt infiltrates shallow soil and groundwater, the sodium is left behind preferentially in soils because it's displacing other positively charged elements, which could then go into groundwater. The elements it replaces are metals. If we have more salt runoff on the side of the roads, chances are, if we look in those streams, we are going to see higher concentrations of heavy metals like copper, zinc and even lead.


PR: You have mentioned the efficacy of brine. What is brine and why is it more effective than traditional road salt?


SG: If you’ve ever driven behind a rock salt truck, you probably noticed it pelts your windshield and shoots salt everywhere. A lot of that rock salt ends up following the natural trajectory of the road, which is designed to drain towards the sides to keep water from pooling. As soon as a snowstorm happens, it's going to melt and flow into the storm drain. That, of course, is bad for the environment, but also doesn’t help remove ice from the road.


With brine, the application is a diluted road salt with water mixture that is usually about 23 percent sodium chloride by volume, and it’s referred to as an “anti-icing” measure. The saltwater infiltrates the top layer of pavement and embeds in the roadway itself, which keeps ice from crystallizing when snow or water hits the surface.


To use an analogy, let’s say you have a large rock that you placed on top of the pavement, but you also have a quarter of that rock’s volume in sand. If you put that sand onto the pavement, it will permeate into nooks and crannies. That's the same idea here: use less material and in a way that makes it stick better to the surface and reduces the need to reapply as often during and after storms.


PR: What are potential positive impacts if municipalities switch from road salt to brine?


SG: There are limited studies on this, but it's been shown that if done properly, brining can reduce salt runoff into streams by anywhere from 23 to 40 percent. If it's 40 percent, you have almost cut the problem in half, and that lower peak salt concentration and runoff would have a profound positive impact on aquatic organisms that are downstream. From a cost standpoint—and I say this theoretically because there are other up-front costs associated with brining at the municipal level—if you reduce salt concentrations by up to 40 percent it means you apply a lot less and therefore spend a lot less.


PR: What can individuals do to decrease road salt runoff, and how much of an impact does individual use have?


SG: We can start by addressing the household salt application problem. Another one of our recent papers suggests that other impervious surfaces, like driveways, sidewalks and parking lots, are probably contributing even more than the roadway application. The best estimate is that individual or private contractor use could be over 10 times what you see on roads. For researchers, part of addressing this is trying to understand why people apply so much salt on their personal properties: are they afraid of lawsuits? Keeping with the Joneses? Are they not aware of ordinances that say you have to shovel within a certain number of hours, which would negate the need for salt anyway?


For homeowners and other individuals, one proposed solution is to use a coffee mug’s worth of salt for every 10 sidewalk squares. Think of it as a “low-sodium diet” to make sure you’re not overapplying. It’s a way we can limit our use of salt and do so in a way that doesn't jeopardize safety. These individuals can also sweep up salt applied before a storm that never materialized to use before the next one. This will prevent the possibility of rain needlessly dissolving the salt.


PR: Are there effective alternatives to road salt that individuals can use?


SG: The only truly effective alternative, unfortunately, is simply using less road salt. While some people apply sand, it also washes into local streams, causing environmental harm. Another option that has gained attention is beet juice—what I like to call the “Dwight Schrute” solution. Beet juice actually works better than road salt because its organic acids prevent ice from crystallizing at temperatures much lower than those at which rock salt is effective. However, from an environmental standpoint, beet juice contains high levels of nutrients, which can contribute to algae growth if it enters waterways. Additionally, recent studies suggest it may also be toxic to aquatic organisms. The growing consensus is that while some road salt is necessary, we need to use less of it.


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3 min

Villanova Professor Sees Costs and Benefits in Corporate and Federal Return-to-Office Mandates

In early February, federal agencies submitted plans in accordance with an executive order to initiate an estimated 1 million government employees’ full-time return to their duty stations. The departments’ actions are among the latest in a series of RTO moves enacted since the start of 2025. Notably, they follow policy changes by corporate giants Amazon, AT&T and JPMorgan, who in January began requiring five days of in-person work for select staffers, with justifications ranging from strengthening culture to improving performance. With more employers expected to require in-office work in the coming months, some predict that 2025 could be the “year of the RTO mandate.” But, given the arguments from those pushing for these policies, it’s worth asking: Are these return-to-office requirements truly justified? Do they actually improve communication, strengthen teams and boost productivity, as supporters claim? According to Kyoung Yong Kim, PhD, whose research focuses on telework, strategic human capital management and employee-organization relationships, the answer is complicated—and highly circumstantial. Dr. Kim says that, by gathering coworkers around the proverbial water cooler, RTO policies can in some cases facilitate dialogue, promote teambuilding and foster organizational success. Yet, in other instances, work-from-home (WFH) arrangements can significantly boost employee morale, efficiency and output. “In a recent paper, my colleague Ijeoma Ugwuanyi [a professor at Hong Kong Metropolitan University] and I examined how social distancing initiatives, which reduce interactions among people, impact working relationships,” says Dr. Kim. “We found that they can actually help improve negative ones, at least in employees’ minds.” Analyzing data collected on 105 working relationships among 43 full-time personnel at a South Korean healthcare company, Dr. Kim and Dr. Ugwuanyi discovered that, when afforded extended WFH privileges, colleagues previously at odds were given the space necessary to reassess their outlooks and improve their dynamics—especially when the individuals involved were viewed as competent and warm. As a result, these repaired relationships generally empowered more effective collaboration in the long run. 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4 min

Villanova Nursing Professor Addresses Overlooked Roles in Mental Health Care

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In a recent conversation, Dr. Weissinger shared insights into his research, the unique roles that parents and nurses have in managing mental health crises and the steps needed to create a more holistic and inclusive approach to care. Q: A large part of your research examines the parents of youth who are experiencing mental health crises. What challenges do parents face when tasked with providing ongoing healthcare for their children who might be facing these issues? Dr. Weissinger: There’s been a lot of recent work looking at how parents can be better supported in any kind of health crisis as their child is experiencing it. At the end of the day, a physician, therapist or nurse practitioner (NP) can support a patient with their clinical expertise in the hospital, but when those patients return home, the responsibility most often falls on the parent to continue that care. If we're then requiring parents to act as case managers and healthcare providers for their children, how can we best equip them to fill those roles? Q: How does a parent’s role in managing a child’s mental health crisis differ from the roles of a physician or therapist? Dr. Weissinger: I studied family intervention science, which looks at both the individual and family processes that may be related to adolescent suicide risk or any other mental health concern, so I like to ask the question: what is this person's role in their family system? Parents oftentimes have a particular role in the family system, and when there's any kind of mental health crisis, that role may have to change: how they act, what tasks they perform, etc. I’m studying the role transition of a parent during a suicide crisis—what are their struggles and what are parents identifying as their big needs? I’m finding that a lot of parents are feeling really alone or shameful in some way, and then they’re using their own money, time or social resources to try to provide care for their child. This often happens because they feel like the mental health system is not providing the support they need to take on that role, so they’re trying to figure out what to do on their own. Q: An additional part of your research surrounds the role of a nurse practitioner in suicide crises. What are some of the findings from your recent research with nurse practitioners (NPs) about their suicide prevention education? Dr. Weissinger: The findings, which will soon be published, are really interesting because they’re very mixed. I went out and asked NPs what they were taught about suicide prevention and when they were taught it as part of their education and training. Some said that their primary care education integrated suicide prevention as a focus of the curriculum. Others mentioned that they didn’t learn about it in their undergraduate or master’s programs, but they’re still expected to know about suicide prevention as part of their job responsibilities. It’s important to highlight these discrepancies and how we need to think about adapting nursing education to include these important topics. Q: What are some of the overlooked responsibilities and challenges of nurses in managing adolescent mental health? Dr. Weissinger: A large percentage of primary care visits are currently conducted by nurse practitioners, and now suicide screenings are expected to be a standard of practice in primary care visits, even though some NPs don't have that specific training. NPs are often left out of consideration and conversation around best practices related to suicide prevention, so we need to make sure that anyone who's conducting these screenings surrounding suicide has the training and the preparation to do so. It's a difficult conversation for NPs to have, especially when they’re working with kids and families. Q: Why is suicide prevention important to study from a nursing lens? Dr. Weissinger: So much mental health research lumps together groups or only studies psychologists and physicians, so a lot of people who provide mental health services or do suicide prevention screenings are left out of these studies. For example, nurses provide a majority of the discharge education on what parents are expected to do at home when a child leaves the hospital—whether that’s administering injections for a child with diabetes or making a house safer for preventing self-harm. Most of the time, a nurse is walking parents through next steps, answering questions and checking in on patient progress. It’s not the psychologists who evaluated the child, or the physicians who decided that the individual needed to be inpatient, it’s the nurses who are providing those points of contact. Q: What do you hope is the main takeaway from your work surrounding mental health and suicide crises? Dr. Weissinger: Suicide is a really complex thing to address, and it needs to be a conversation that isn’t looking for a silver bullet. It’s a conversation that asks the questions: how do we improve the mental health care system? How do we get primary care providers trained and involved in these discussions? How do we best prepare family members to support individuals who are struggling? Not all researchers need to work on every part of this, but it needs to be a total, all-encompassing effort.

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