# UL 979 · UL — Which OSHA-recognized labs (NRTLs) can certify to a given test standard

For UL 979 · UL, test standard is UL 979; standard title is Water Treatment Appliances; nrtl is UL; laboratory is UL LLC; status is currently recognized, recorded from its source on 2026-09-08; source re-checked 2026-09-17.

- **Test standard:** UL 979 _(verified: appears in the quote below)_
- **Standard title:** Water Treatment Appliances _(verified: appears in the quote below)_
- **NRTL:** UL _(verified: appears in the quote below)_
- **Laboratory:** UL LLC
- **Status:** currently recognized _(our reading, not quoted from the source)_

## 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: 2026-12-07.
Part of [Which OSHA-recognized labs (NRTLs) can certify to a given test standard](https://referencesource.org/nrtl-recognized-test-standards/).