Every CO2 supplier we could find in the San Antonio area (Texas) was checked one by one, and 10 of them made the list. 2 will refill the cylinder you walk in with. 3 only swap it for a different tank, which matters if yours is new or an odd size. 5 would not confirm either way, so those are marked call to confirm rather than guessed at. The common sizes here are 60L; most cover welding, soda, homebrew.
10places listed
2confirmed refill
0confirmed food grade
Last checked September 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
BrewCity Homebrew Supply
Refill
8666 Huebner Rd Ste 206 · San Antonio, TX 78240
ServiceRefill
Food gradeCall to confirm
Tank sizesAsk when you call
Your cylinderYes, refills yours
homebrewsodapaintball
Hours Wed-Sat 10:00-18:00; Sun 12:00-16:00; Mon-Tue Closed
Current business listings verify the active Huebner Road store. Recent March 2025 local evidence confirms CO2 filling at BrewCity. An older owner post described refilling cylinders from 20 lb down to paintball and SodaStream sizes, but tank sizes are left unknown because that size evidence is older. No reliable public email or explicit food-grade designation was verified. Additional service evidence: https://www.reddit.com/r/sanantonio/comments/1j6qciz
Current gas-industry and business listings verify the active San Antonio location and carbon dioxide service. Current listing text explicitly says customer-owned bottles are filled onsite and lists bulk CO2 and cylinders. Recent January 2026 local evidence also recommends Natwel for CO2 tank refills. No verified public email or food-grade designation was found.
Hours Mon-Fri 08:00-21:00; Sat 09:00-21:00; Sun 10:00-19:00
Official current Staples page verifies this active store. A current SodaStream retailer listing for this exact branch explicitly states 60L exchange and spare carbonators. This is SodaStream exchange only and is not represented as standard 5 lb or 20 lb cylinder service. No reliable public branch email was found. Exchange evidence: https://www.mystore411.com/store/view/3673681/Sodastream-San-Antonio
Current official site verifies the active San Antonio store, hours, phone, and public email. A current SodaStream retailer listing for this exact location explicitly states 60L exchange and spare carbonators. This is SodaStream exchange only and is not represented as standard portable-cylinder service. Exchange evidence: https://www.mystore411.com/store/view/3673674/Sodastream-San-Antonio
Official current branch page explicitly lists carbon dioxide and publishes a branch-specific email. Recent January 2026 San Antonio CO2 discussion reports empty-cylinder swapping at Airgas. Because the branch page does not explicitly designate its CO2 as food grade or publish exchange cylinder sizes, those fields remain unknown. Additional behavior evidence: https://www.reddit.com/r/sanantonio/comments/1qnl87v/where_to_refill_co2_tanks_in_san_antonio/
Official current branch page verifies the Schertz physical location serving San Antonio. Current Gas and Supply CO2 materials identify carbon dioxide supply for food, beverage, and welding applications and direct customers to local branches. Because branch-specific portable refill versus exchange behavior and food-grade designation are not explicit, moat fields remain conservative. The official branch uses a contact form rather than a published email address.
Linde Welding Gas & Equipment Center - Frost Bank Center
Call to confirm
822 Frost Bank Center Dr · San Antonio, TX 78219
ServiceCall to confirm
Food gradeCall to confirm
Tank sizesAsk when you call
Your cylinderAsk
welding
Hours Mon-Fri 08:00-16:30; Sat-Sun Closed
Official current branch page explicitly lists Carbon Dioxide among gases available at this exact retail location. Linde's official corporate contact email is used because no branch-specific public email is published. Portable refill versus exchange behavior, food-grade status, and cylinder sizes were not established.
Linde Welding Gas & Equipment Center - New Laredo Hwy
Call to confirm
330 New Laredo Hwy · San Antonio, TX 78211
ServiceCall to confirm
Food gradeCall to confirm
Tank sizesAsk when you call
Your cylinderAsk
welding
Hours Mon-Fri 08:00-16:30; Sat-Sun Closed
Official current branch page explicitly lists Carbon Dioxide among gases available at this exact retail location. Linde's official corporate contact email is used because no branch-specific public email is published. Portable refill versus exchange behavior, food-grade status, and cylinder sizes were not established.
Current business information verifies this active San Antonio compressed-gas retail branch. Recent January 2026 local evidence recommends MATHESON for CO2 service. A branch-specific 2022 review described a small-bottle CO2 exchange for a kegerator, but current moat behavior is left unknown because that exchange detail is older. No verified public email or current food-grade designation was found.
Official current site verifies the active welding-supply business and physical location. Recent January 2026 San Antonio CO2 discussion identifies Welders Supply as a local CO2 source, but the available evidence does not clearly distinguish same-cylinder refill from exchange. No reliable public email, food-grade designation, or cylinder sizes were verified. Additional service evidence: https://www.reddit.com/r/sanantonio/comments/1qnl87v/where_to_refill_co2_tanks_in_san_antonio/