US lawWashingtonRegulationsTitle 16 — AGRICULTURE, DEPARTMENT OFChapter 16-231 — USE RESTRICTED HERBICIDES16-231-420WAC 16-231-420WAC 16-231-420. Boundaries for Columbia County Area 4Last amended: 2019Year: 2026Length: 20 wordsOfficial source Area 4 description. This area includes all remaining lands in Columbia County not included in WAC 16-231-413 and 16-231-415 .PreviousWAC 16-231-415NextWAC 16-231-425