US lawWashingtonRegulationsTitle 16 — AGRICULTURE, DEPARTMENT OFChapter 16-202 — APPLICATION OF PESTICIDES AND PLANT NUTRIENTS THROUGH IRRIGATION SYSTEMS16-202-100WAC 16-202-100WAC 16-202-100. PurposeLast amended: 2025Year: 2026Length: 27 wordsOfficial source The purpose of this chapter is to establish standards for chemigation and fertigation that are protective of existing and future uses of surface water and groundwater quality.NextWAC 16-202-110