Bring the water to a boil in a medium saucepan. Add bulgur; partially cover, reduce heat, and simmer for 5 minutes. Drain; cool.
While the bulgur cooks, heat a medium nonstick skillet coated with cooking spray over medium-high heat. Add scallops, and cook 3 minutes, turning once. Remove from heat; place scallops in a large bowl.
Add bulgur, cucumber, and next 9 ingredients (cucumber through pepper) to scallops in bowl; toss well to coat. Place 1 cup watercress on each of 6 plates; top each serving with 1 cup scallop mixture.