Data Visualization

This interactive mapping tool was created for visualization use only. It is based on raw data. If you are interested in the data, please contact TRCA to acquire the accompanying metadata for correction and interpretation purposes.

How to Use the Mapping Application

On the left hand side of the screen, choose the water quality indicator, the date, and the sample depth you are interested in and search.

You can change the basemap to show imagery, streets, terrain, topography, etc. by clicking the button with the four squares on the upper right corner. It is also possible to draw on it using the paint palette located in the upper left hand corner.

Detection Limits change over time as instruments and analyses improve. We have shown how detection limits have changed over the years in the legends.