Rising Road Salt Threatens New Hampshire’s Waterways and Drinking Water

Salt levels in New Hampshire are steadily increasing, driven by development, more paved surfaces, and changing winter conditions. Road salt seeps into waterways, threatening aquatic life and contaminating drinking water, with the number of salt-affected wells rising 150% over 30 years. High chloride levels are toxic to fish and can corrode pipes, releasing metals like lead and copper.

The state’s Voluntary Commercial Salt Applicator Certification Program (“Green Snow Pro”) trains companies and municipalities in efficient salt use, yielding cost savings and reduced application. However, despite increased participation, salt accumulation continues due to warming winters, more freeze-thaw cycles, and expanded infrastructure.

Experts say a cultural shift is also needed, as public expectations for icy sidewalks have normalized over-salting. While stricter regulations on storage and application are under discussion, long-term solutions will require both behavioral change and policy support to protect New Hampshire’s freshwater systems.

20-10-2025