CFR › Title 21 › Part 556 › §556.18021 CFR §556.180Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy link(a)[Reserved](b)Tolerances. The tolerance for dichlorvos is:(1)Swine. Edible tissues: 0.1 ppm.(2)[Reserved](c)Related conditions of use. See §§ 520.596 and 558.198 of this chapter.