Hi my kid has celiac and we live in the area. There is not much. &pizza in Georgetown is closed. Pizzeria Paradiso will cross contamination(kid got sick). A little farther is Comet pizza but the gluten free pizza got thumbs down from my kid.
We have gotten a lot of pizzas from domino’s with no problems -2330 Wisconsin Ave NW. they are pretty quick and easy pickup.
Across the street, Sprig and Sprout can do gluten free reliably if you want something different vs pizza. They have a pretty big gluten free menu.
https://www.sprigandsproutdc.com/menu
On the left is a box to check for gluten free stuff. It pretty good and no issues.
Hope this helps