Every CO2 supplier we could find in the Baltimore area (Maryland) was checked one by one, and 15 of them made the list. 3 will refill the cylinder you walk in with. 8 only swap it for a different tank, which matters if yours is new or an odd size. 4 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; most cover welding, industrial, soda.
15places listed
3confirmed 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
Earlbeck Gases & Technologies - Baltimore
Refill
8204 Pulaski Hwy · Baltimore, MD 21237
ServiceRefill
Food gradeCall to confirm
Tank sizesAsk when you call
Your cylinderYes, refills yours
weldingindustrial
Hours Mon-Fri 07:30-17:00; Sat-Sun Closed
Official current Baltimore location page verifies the gas showroom, address, phone, hours, and customer-service email. Current company materials confirm active industrial-gas operations at this exact Baltimore facility. Historical exact-site industry evidence identifies the Baltimore fill plant as filling carbon dioxide; current operation and location were independently reverified in 2026. Food-grade status and portable refill sizes were not established.
Hours Mon-Fri 08:00-16:30; Sat 09:00-13:00; Sun Closed
Official current locations page identifies this exact Savage supply plant as handling 'Tank Refills (Propane and CO2)' and publishes current hours. The official corporate customer-care email is used because no plant-specific email was found. Recent January 2025 Annapolis-area customer evidence also identifies Poist in Laurel as a CO2 refill option. Food-grade status and exact CO2 refill sizes were not explicitly published.
Official current site verifies this Harford County gas and welding-supply operation, address, phone, email, and hours. Fresh February 2026 Harford County community evidence names Moxley's directly in response to a request for CO2 canister refills. Because the exact CO2 grade and supported sizes are not published, food_grade and tank_sizes remain unknown.
Official current Roberts location list verifies the Annapolis branch, phone, and regular hours; the email is Roberts' official general contact address. January 2025 Annapolis customer evidence explicitly says this location uses a tank-swap model rather than returning the customer's same CO2 cylinder. Food-grade status and exact exchange sizes were not verified at branch level. 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 and a current map listing verify this Baltimore branch, phone, and hours. Roberts currently supplies carbon dioxide as part of its gas business, but the branch page does not publish portable-cylinder refill versus exchange behavior. The official general email is used. Food-grade status and sizes remain unknown rather than applying chainwide moat claims. 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 list verifies the active Cockeysville gas-store branch, phone, and regular hours. Roberts currently supplies carbon dioxide, but the local branch does not publish portable-cylinder refill versus exchange behavior. The official general email is used. Food-grade status and exact sizes 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 list verifies this active Dundalk gas-store branch, phone, and regular hours. Roberts currently supplies carbon dioxide, but branch-specific portable-cylinder refill versus exchange behavior is not published. The official general email is used; food-grade status and exact sizes 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 list verifies the Edgewood branch, phone, and hours; the email is Roberts' official general contact address. Fresh February 2026 Harford County discussion identifies Roberts 'off of 40' as the area's established CO2-canister option, consistent with this Pulaski Highway branch. The discussion does not clearly distinguish refill from exchange, so service_type and accepts_customer_tanks 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.
706 Crain Highway North #D · Glen Burnie, MD 21061
ServiceExchange
Food gradeYes
Tank sizesAsk when you call
Your cylinderExchange only
weldingindustrial
Hours Mon-Fri 07:30-17:00; Sat-Sun Closed
Official current Roberts location list verifies the active Glen Burnie branch, phone, and regular hours. Roberts currently supplies carbon dioxide, but the branch does not publish the portable-cylinder refill versus exchange workflow. The official general email is used. Food-grade status and exact cylinder sizes 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.
Current business and map evidence verifies the active Joppa location, website, phone, and hours. Fresh February 2026 Harford County community evidence explicitly says Midway will swap CO2. No reliable public email, exact supported exchange size, or food-grade designation was verified.
Current official site verifies the Forest Hill location, phone, and public business email; current local listings verify regular hours. Fresh February 2026 Harford County community evidence explicitly reports swapping CO2 at Ronnie's. This is classified as exchange only. Exact cylinder sizes and an explicit food-grade designation were not verified.
Official current branch page verifies the exact Dundalk location, branch-specific email, phone, regular hours, and explicitly lists carbon dioxide at this store. Portable customer-cylinder refill versus exchange behavior, food-grade status, and exact supported cylinder sizes are not published.
Fresh 2026 carrier and current local business records verify the active Sparrows Point operation, address, phone, public business email, and gas-carrying status. Current local supplier evidence lists carbon dioxide among compressed gases associated with this business. No reliable current official website, portable refill-versus-exchange workflow, food-grade designation, or cylinder sizes were verified.
Official current branch page verifies this Baltimore retail gas location, phone, hours, and explicitly lists Carbon Dioxide at the branch. The email is Linde's official corporate customer contact because no branch-specific public email was found. Portable refill versus exchange behavior, food-grade status, and exact cylinder sizes are not published.