Preheat oven to 350 degrees. Grease and flour nine 3x6 inch loaf pans (or two large loaf pans if you prefer).
In a large bowl, whisk together both the flours, baking soda, cinnamon, nutmeg and salt.
In a very large mixing bowl, combine the sugar, oil, pumpkin, water and eggs. Stir with a spoon or heavy duty scraper until well blended.
Add the flour mixture to the pumpkin mixture and stir until fully blended, then stir in the blueberries.
Divide the batter between the pans and bake for 40 minutes or until a toothpick inserted comes out with moist crumbs. If making large loaves, the time will be around an hour.
Remove from oven and let cool for 10 to 15 minutes. Carefully loosen from loaf pans and then turn onto a cooling rack. Allow the loaves to cool completely, then wrap in plastic wrap and freeze or refrigerate until ready to serve.
To store, wrap well in plastic wrap and refrigerate for at least a week, or place wrapped loaves in a plastic freezer bag and freeze for several months.