Official list entries
Authority-first tester table
Use the governing authority list first. Provider profiles and sponsor routing remain secondary to the official approval context.
| Full name | License notes | Company or label | Review date |
|---|---|---|---|
| Air & Water Factor | Official tester listed by Phoenix and also carried on Mesa and Avondale utility rosters for the metro cluster. | Officially listed across multiple Phoenix-metro utility tester lists. | 2026-04-05 |
| Western Backflow Testing LLC | Official tester listed by Phoenix and also present on Scottsdale's quarterly tester roster. | Officially listed on Phoenix and Scottsdale tester lists. | 2026-04-05 |
| Guardian Industries LLC | Official Phoenix tester list entry | Officially listed on the Phoenix tester PDF | 2026-04-04 |