Every CO2 supplier we could find in the Washington area (Washington DC) was checked one by one, and 15 of them made the list. 2 will refill the cylinder you walk in with. 5 only swap it for a different tank, which matters if yours is new or an odd size. 8 would not confirm either way, so those are marked call to confirm rather than guessed at. 6 confirm food grade CO2 for anything you actually drink; the common sizes here are 20lb, 5lb, 10lb; most cover welding, industrial, soda.
15places listed
2confirmed refill
6confirmed food grade
Last checked October 2026
Sorted for you: places that refill your own tank come first, then the most complete, confirmed listings. Exchange-only and unconfirmed spots follow.
KeyRefillBothExchangeConfirm
Arc3 Gases - Alexandria
Refill + Exchange
6590 Fleet Dr · Alexandria, VA 22310
ServiceRefill + Exchange
Food gradeYes
Tank sizesAsk when you call
Your cylinderYes, refills yours
homebrewsodaweldingbeverage
Hours Mon-Fri 07:30-17:00; Sat-Sun Closed
Official current branch page verifies this Alexandria location and lists Beverage Gases. Current branch-specific business evidence explicitly lists CO2 Supply, Carbon Dioxide, Gas Cylinder Refill, and Cylinder Exchange. Arc3's official beverage-gas page explicitly advertises Beverage Grade CO2 Refills and high-pressure CO2 cylinders, supporting food_grade=yes for this branch because the branch specifically offers beverage gases. Exact qualifying cylinder sizes were not published.
Hours Sun 11:00-15:00; Mon Closed; Tue-Fri 11:00-18:00; Sat 10:00-17:00
Official current CO2 page states that Jay's fills customer 2.5 lb, 5 lb, and 10 lb CO2 tanks and exchanges 20 lb tanks. Tanks outside hydrostatic test are exchanged with an added fee. Official contact and hours pages verify the Manassas location and phone. The official email is masked in publicly readable text, so it is not guessed. Food-grade status was not explicitly published.
Official current Roberts location list verifies the Sterling branch and hours; the email is Roberts' official general contact address. Current branch-specific evidence says this location exchanges tanks including food-grade CO2. A February 2025 customer report specifically documents buying and replacing 5 lb food-grade CO2 tanks for SodaStream use, and a May 2025 report confirms CO2 tank exchange. Confirmed by Roberts Oxygen in October 2026: the CO2 is food grade and every branch does cylinder exchange rather than refilling the cylinder you bring in. The company stated this applies across all of its locations, so it is a company policy rather than a branch-level check.
Official current product page states that customers return an exhausted 20 lb CO2 tank and receive a full tank, which is an exchange rather than a same-cylinder refill. Official current site verifies the physical Washington location, phone, email, and hours. Food-grade status was not published.
The current help page explicitly says DC Kegs cannot refill gas tanks and instead swaps empty tanks for full tanks of the same size. The site lists 5 lb, 10 lb, and 20 lb CO2 sizes. A general page still uses the word refill, but the dedicated help page resolves the contradiction in favor of exchange. The New York Avenue address is a service base rather than a normal walk-in storefront; scheduled pickup coordination is required. Food-grade status was not explicitly published.
Official current Roberts location list verifies the Bladensburg branch and hours; the email is Roberts' official general contact address. Fresh March 2025 Washington-area aquarium evidence identifies Roberts in the Hyattsville area as a current source for 5 lb aquarium CO2, consistent with this nearby active Kenilworth Avenue branch. Because the evidence does not clearly distinguish same-cylinder refill from exchange or support exact sizes at this branch, those moat fields remain unknown. Confirmed by Roberts Oxygen in October 2026: the CO2 is food grade and every branch does cylinder exchange rather than refilling the cylinder you bring in. The company stated this applies across all of its locations, so it is a company policy rather than a branch-level check.
Official current Roberts location information verifies the Springfield branch and hours; the email is Roberts' official general contact address. Current local business evidence explicitly describes this branch as offering CO2 exchange service, and recent 2026 reviews confirm active tank-swap operations. Exact CO2 exchange sizes and food-grade status were not verified. Confirmed by Roberts Oxygen in October 2026: the CO2 is food grade and every branch does cylinder exchange rather than refilling the cylinder you bring in. The company stated this applies across all of its locations, so it is a company policy rather than a branch-level check.
Official current branch page verifies the Manassas location, phone, hours, and Beverage Gases service. Arc3's official beverage-gas page explicitly offers Beverage Grade CO2 Refills and high-pressure CO2 cylinders, supporting food_grade=yes because this branch specifically offers beverage gases. Public branch evidence did not clearly establish whether portable walk-in cylinders are same-cylinder refilled, exchanged, or both, so service_type and accepts_customer_tanks remain unknown.
Current business records verify the Springfield depot. NuCO2's official current site states that it supplies only Certified Beverage Grade CO2 and provides beverage carbonation service, including high-pressure cylinders and bulk systems. This is primarily commercial beverage-gas service rather than a standard consumer walk-in refill location. Public evidence does not establish whether portable customer-owned cylinders at this depot are same-cylinder refilled or exchanged, so service_type and accepts_customer_tanks remain unknown.
Official current branch page verifies the Alexandria location, branch-specific email, phone, hours, and carbon dioxide availability. Portable customer-cylinder refill versus exchange behavior, food-grade status, and exact cylinder sizes remain unknown.
Official current branch page verifies the Frederick store, branch-specific email, phone, hours, and explicitly lists carbon dioxide among available gases. Frederick is included at the outer edge of the practical Washington metro because residents in the northwest metro may reasonably use it. Portable refill versus exchange behavior, food-grade status, and exact cylinder sizes are not published.
Official current branch page verifies this exact Hyattsville location, branch-specific email, phone, hours, and explicitly lists carbon dioxide. Portable customer-cylinder refill versus exchange behavior, food-grade status, and supported cylinder sizes are not published.
Official current branch page verifies the Manassas store, branch-specific email, phone, hours, and explicitly lists carbon dioxide among gases available. Portable refill versus exchange behavior, food-grade status, and qualifying cylinder sizes were not published.
Official current branch page verifies the Frederick retail gas location, phone, hours, and explicitly lists Carbon Dioxide among gases available. The email is Linde's official corporate customer contact because no branch-specific public email was verified. Frederick is an outer practical-metro option. Portable refill versus exchange behavior, food-grade status, and exact cylinder sizes remain unknown.
Official current branch page verifies the Jessup retail gas location, phone, hours, and explicitly lists Carbon Dioxide among gases available. The email is Linde's official corporate customer contact because no branch-specific public email was verified. Portable refill versus exchange behavior, food-grade status, and exact cylinder sizes remain unknown.