# UL 979 · UL LLC — Which OSHA NRTL is recognized for which test standard: all 21 labs' scopes of recognition, cross-referenced

For UL 979 · UL LLC, laboratory is UL LLC; standard number is UL 979; standard title is Water Treatment Appliances, verified against its source on 2026-09-17.

- **Laboratory:** UL LLC
- **Standard number:** UL 979 _(verified: appears in the quote below)_
- **Standard title:** Water Treatment Appliances _(verified: appears in the quote below)_

## What the source says

> UL 979 | Water Treatment Appliances |

## Source

- https://www.osha.gov/nationally-recognized-testing-laboratory-program/ul

Last verified: 2026-09-17. Review by: 2027-01-06.
Part of [Which OSHA NRTL is recognized for which test standard: all 21 labs' scopes of recognition, cross-referenced](https://referencesource.org/nrtl-recognition-scopes/).