Local rules only
Washington
Last checked 2026-09-23
Washington's 2023 HB 1173 requires new and existing wind energy facilities to use aircraft-detection lighting systems so obstruction lights only activate when aircraft are nearby, instead of staying lit continuously; existing facilities must comply by January 1, 2026. It targets turbine light pollution specifically and does not set general outdoor-lighting or dark-sky rules for other development.
| Statute | Citation | Year |
|---|---|---|
| Wind turbine aircraft detection lighting systems | 2023 HB 1173 | 2023 |