Calibration of backflow test kits is vital to ensure they are working properly. View the list of local approved backflow gauge testing companies:
| Company | Address | Telephone |
| Fluid Meter Service Corp. | 7304 McNeil Drive, Suite 604, Austin TX 78729 | 512-258-3594 |
| Test Gauge & Backflow Supply | 3321 Garden Brook Drive, Farmers Branch TX 75234 | 469-206-3741 |
If you are a backflow gauge testing company and would like to be added to this list, please email your company name, address and telephone number to awcrossconnection@austintexas.gov.