In the early 1970s, before an explosive growth in housing and winter road maintenance, the natural background chloride level of Lake Simcoe was just seven milligrams per litre (mg/L). According to monitoring data from the Lake Simcoe Region Conservation Authority (LSRCA), the chloride level has now risen to 63.7 mg/L. Lake Simcoe’s rising salinity level is the direct result of winter road salt washing off highways and commercial parking lots in…
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