Is Washington Chapter 173-905 WAC in force?

Yes. In force from Jan 16, 2026.

Which products does Washington Chapter 173-905 WAC affect?

Washington Chapter 173-905 WAC affects Residential energy storage systems and Commercial and utility energy storage systems.

When does Washington Chapter 173-905 WAC take effect?

The effective date on file is January 16, 2026.

Washington

Chapter 173-905 WAC

PartialRead in the state’s own source. It stays partial until the passage is on file word for word.

What does Washington Chapter 173-905 WAC do? Requires producers of portable batteries to join approved stewardship plans from Jan 1, 2027, and adds medium format batteries in 2029. From Jan 1, 2028, retailers may not sell large format batteries without producer marking.

Facts

Kind: Rule
Status: In force
Stage: In force
Signed or decided: January 16, 2026
Effective: January 16, 2026
Topics: Recycling and end of life
Products: Residential energy storage systems Commercial and utility energy storage systems
Source: Washington State Code Reviser (opens in a new tab)
Citation: Washington State Register, WSR 26-01-103

The state’s codes

The codes that reach each product this law names, with the edition Washington is on. Each links to the record.

For information only. Your local building or fire official decides which code applies. We check state records often but can miss a recent change, so confirm with your official before you design, permit, or install. Terms of use