Be Salt Wise in Winter

It’s as easy as 1-2-3! Shovel right away. Use less salt. (One 12-ounce mug is all you need to melt 10 sidewalk squares!) After storm events, sweep up any excess salt for re-use.

A Little Goes a Long Way

Most people know that salt is effective in melting snow and ice and it keeps our roadways safe in the winter. But many people may not realize that the salt we use on sidewalks, driveways and roads is harmful to the environment. Salt doesn’t just go away when the snow/ice melts. It seeps into the ground and travels with stormwater into streams and eventually into our drinking water sources – the Potomac and Patuxent Rivers.

WSSC Water closely monitors the water entering our Potomac and Patuxent Water Filtration Plants. Over the past 30 years, the average salt levels (sodium and chloride are the two components of salt) have been steadily increasing. The levels peak in the winter months and are higher in years where we experience more winter weather events. Because there is no economically feasible way to remove salt during filtration, higher levels end up in the drinking water.

Damage Salt Causes

Harms aquatic animals and plants in local streams
Pollutes soil and water
Damages buildings
Corrodes vehicles, pavement and water mains
Corrodes water mains and leads to an increase in water main breaks and cause discolored water

What is the impact on human health?

Sodium in drinking water is not a health concern for most of us, but the U.S. Environmental Protection Agency recommends sodium in drinking water be less than 20 milligrams per liter for those on severely restricted sodium diets. We recommend you talk to your doctor if you have medical conditions sensitive to sodium levels, such as high blood pressure or kidney disease.

Do your part to keep excess salt out of local waterways.

Homeowner tips from the Carey Institute of Ecosystem Studies

Learn what you can do to avoid over-using road salt that can contaminate drinking water, harm aquatic plants and animals, and damage metal and concrete.

Get Road Salt Tips for Homeowners

What are state and local agencies doing about road salt use?

In the last five years, the State Highway Administration has reduced its overall salt usage by half. See what it and Maryland's Department of the Environment are doing to manage road salt.

Get the 411 on Road Salt

WSSC Water-Led Salt Summits

Several years ago, WSSC Water recognized that runoff from winter de-icing compounds (primarily rock salt, consisting of sodium and chloride) applied to roads, sidewalks and parking lots during winter storms is a pollutant of concern. As a result, WSSC Water hosted its first Salt Summit in 2018 to raise awareness about the effects of salt pollution on our drinking water sources.

These WSSC Water events bring together local and regional experts from the water industry, Public Works Departments, environmental organizations and academia. The Summits focus on managing salt to reduce runoff into drinking water sources. Below, you'll find key documents from past Salt Summits with valuable insights into these important topics.

Last Modified: April 7, 2025, 11:01 am EDT

Be Salt Wise in Winter

A Little Goes a Long Way

Do your part to keep excess salt out of local waterways.

Homeowner tips from the Carey Institute of Ecosystem Studies

What are state and local agencies doing about road salt use?

WSSC Water-Led Salt Summits

Salt Summit 2025

Salt Summit 2024

Salt Summit 2023

Salt Summit 2019

Salt Summit 2018