Savory Potato Salad

6 (about 2 lb) medium potatoes
2 stalks celery, finely chopped
2 stalks scallion, finely chopped
1/4 C red bell pepper, coarsely chopped
1/4 C green bell pepper, coarsely chopped
1 Tbsp onion, finely chopped
1 egg, hard boiled, chopped
6 Tbsp light mayonnaise
1 tsp mustard
1/2 tsp salt
1/4 tsp black pepper
1/4 tsp dill weed, dried