Like many small English towns, Washington does not have many restaurants but does boast a few quality ones. Fiume's, on the banks of the River Wear at Fatfield, and San Remo, in Concord are both of high quality and good reputation amongst local people.
There are many takeaway food establishments within the town, with nearly every village boasting a Chinese, Indian or traditional English chip shop. Costs are usually cheap.
Many, if not all, of Washingtons public houses will serve some variety of pub meal, although quality and cost may vary. Ask the manager beforehand to make sure you don't arrive somewhere that won't serve food.
Washington also contains the usual range of fast food establishments, including McDonalds, Subway and Greggs.