To make the syrup, mix the sugar, water, zest and blueberries in a sauce pan and heat over high until boiling. Reduce heat and simmer for 10 minutes or so until the blueberries have broken down some. Strain through a fine mesh strainer and cool.
In a large pitcher, add the lemon juice, syrup, sparking water and ice and stir. Serve in glasses with a straw.