Salt Watch
Loudoun Wildlife Conservancy’s Salt Watch Program helps monitor and understand the impact of road salt on local streams. In partnership with the Izaak Walton League of America, our program began in 2021, gathering vital chloride data to track and identify pollution hotspots, raise awareness about the relationship between salt and stream health, and advocate for smarter salting practices.
Now in its fifth season, Loudoun Wildlife’s Salt Watch program has collected over 1,300 data points (as of December 2025) — currently contributing 27 percent of the nationwide data set. We currently have nearly 80 Salt Watch sites and over 100 volunteers, but are always looking for more! Data collected by our Salt Watch volunteers is shared on the Clean Water Hub and the Izaak Walton League of America’s Salt Watch Map, making it accessible to the public and policy makers.
What is Chloride and Why Do We Monitor It?
Chloride is a component of common salts, like sodium chloride (table salt) and calcium chloride that is often used for de-icing roads, sidewalks and parking lots. When these salts dissolve in water, they release chloride ions. Chloride acts as a reliable indicator of salt pollution because it persists in streams long after the salt dissolves.
This persistence means chloride levels can remain elevated year round, even in warmer months, reflecting the impact of winter salt applications. By monitoring chloride, we can accurately assess the impact of road salts on aquatic ecosystems, identify problem areas and promote sustainable salting practices.
How You Can Get Involved
Loudoun Wildlife’s Salt Watch team accepts volunteers year round and all around the county.
Interested in helping Loudoun Wildlife collect data about the salt levels in our local streams? Follow these simple steps to get started.
- Watch this training video on YouTube from our Season 4 kickoff.
- Email Stream Monitoring Program Coordinator Amy Ulland at aulland@loudounwildlife.org to register and she’ll send you more information about how to sign up for a stream site, request your free Salt Watch kit, and determine when you’ll be monitoring.
- When you get your kit, you will take a baseline reading of the chloride levels at your stream site before any snowfall or road treatments. Then you’ll test your stream site monthly (either on the 1st or the 15th of month) and around winter weather events.
- After completing each test, you’ll send in your data using a Google Form and a picture of your test strip to Amy. Your data to appear on the Clean Water Hub and Salt Watch maps.
How to Use a Salt Watch Kit
Salt Watch kit
Your kit will include four easy-to-use test strips, plus all the information you need to take salt readings and submit your results. To use your kit, you’ll need access to a stream, a small container (like a juice glass) to hold some water, a camera to take a photo of your results, and a computer or smartphone so you can submit your findings.
You’ll just take a small sample of stream water in your container, put your strip into the water and wait for a few minutes for the strip to detect the chloride levels.
For More Information:
Best practices for road salt
How to advocate for smarter salt use in your community