# Washington — HFC refrigerant GWP regulations by US state

For Washington, equipment category is Existing equipment that undergoes a retrofit; gwp limit is less than 150; effective date is Jan 1, 2029; regulatory status is signed into law; regulation citation is Chapter 173-443 WAC, recorded from its source on 2026-08-05.

- **State:** Washington
- **Equipment category:** Existing equipment that undergoes a retrofit
- **GWP limit:** less than 150
- **Effective date:** Jan 1, 2029
- **Regulatory status:** signed into law _(our reading, not quoted from the source)_
- **Regulation citation:** Chapter 173-443 WAC

## What the source says

> Washington has Finalized a rulemaking to update <https://ecology.wa.gov/getattachment/eb351094-2b5e-49ce-b626-c90092542a75/OTS-4615-6-For-Filing.pdf> Chapter 173-443 WAC for HFCs and other fluorinated greenhouse gases that: Established GWP threshold less than 150 for HFCs used in new equipment (Jan 1, 2025) Established GWP threshold less than 150 for existing equipment that undergoes a retrofit (Jan 1, 2029)

## Source

- https://nasrc.org/hfc-policy-tracker/

Last verified: 2026-08-05. Review by: 2027-02-01.
Part of [HFC refrigerant GWP regulations by US state](https://referencesource.org/hfc-refrigerant-regulations-by-state/).