1. (1) A chemigation application must be visually inspected by a certified applicator or someone under their direct supervision at least once during each four-hour period, unless the pesticide label(s) or product characteristics requires a more frequent interval.
2. (2) The certified applicator is considered principally responsible to ensure that the chemigation system functions properly and conforms with the provisions of this chapter.

3. (3) A chemigation system capable of being monitored by the certified operator from a remote location shall not require visual inspection every four hours if it is utilizing the following capabilities:

   1. (a) Automatically notifies the certified applicator of the pesticide flow rate at least once every four hours or more frequently when required by the label, location, or product characteristics;
   2. (b) Automatically notifies the certified applicator in the event of any power failure, equipment shutdown, or other fault affecting the chemigation; and
   3. (c) Allows the certified applicator to shut down the chemigation equipment from their location.
4. (4) Notwithstanding the provisions of this section, the application must be continuously observed whenever sensitive areas are at risk of being exposed to drift, runoff, or overspray.

[Statutory Authority: RCW 17.21.030, 15.58.040(2), and 15.54.800(2). WSR 25-22-066, s 16-202-360, filed 10/31/25, effective 12/1/25.]