2020-21 Findings

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During Season 4 of Winter Salt Watch (2020-2021), volunteers sent in 2,660 test results from all around the country. Twenty-seven percent of those tests showed salt levels acutely toxic to aquatic life.

How did different regions of the U.S. compare? Check out the highlighted regions below, then explore our interactive map to see how your area measured up.

Results - U.S.


Results - DC
Results - Detroit
Results - Philadelphia
Results - Twin Cities


Explore the interactive map of all the results from Season 4! Click on any dot to see more data, or click the double-arrow icon at the top left to see the legend.