Changes

*Sodium also has an aesthetic objective of 200 mg/L based on taste, as well as a guideline of 20 mg/L for people on sodium restricted diets

*Sodium also has an aesthetic objective of 200 mg/L based on taste, as well as a guideline of 20 mg/L for people on sodium restricted diets

===Observed Stream Concentrations===

==Observed Chloride Levels in Streams Concentrations==

Monitoring data show that our freshwater resources are become increasingly salinized, particularly in urban areas.  As the graphic shows, several urban streams in the GTA have average chloride concentrations exceeding the chronic toxicity threshold, and at some monitoring stations, even the acute toxicity threshold is exceeded.  This is not just a winter problem; it can take months for water to move through the soils and into the rivers, resulting in high concentrations even in the spring and summer during sensitive life stages for many aquatic species.   

Monitoring data show that our freshwater resources are become increasingly salinized, particularly in urban areas.  As the graphic shows, several urban streams in the GTA have average chloride concentrations exceeding the chronic toxicity threshold, and at some monitoring stations, even the acute toxicity threshold is exceeded.  This is not just a winter problem; it can take months for water to move through the soils and into the rivers, resulting in high concentrations even in the spring and summer during sensitive life stages for many aquatic species.