Place sour cream, cream cheese, worcestershire sauce, salt, onion powder, paprika, garlic powder, and black pepper into a large bowl, then use a hand mixer to beat until combined.
Gently stir in the spinach and water chestnuts, then taste and re-season, if necessary.
Serve immediately with crackers, chips, or bread, or place in the fridge to chill (preferred way to serve) until ready to eat.