For purposes of this article, the following definitions apply:

(a) “Active ingredient” has the same meaning as defined in Section 136 of Title 7 of the United States Code.

(b) “Agricultural use” has the same meaning as defined in Section 11408.

(c) “Board” means the State Water Resources Control Board.

(d) “Chemigation” means a method of irrigation whereby a pesticide is mixed with irrigation water before the water is applied to the crop or to the soil.

(e) “Degradation product” means a substance resulting from the transformation of a pesticide by physicochemical or biochemical means.

(f) “Groundwater protection data gap” means that, for a particular pesticide, the director, after study, has been unable to determine that each study required pursuant to subdivision (a) of Section 13143 has been submitted or that each study submitted pursuant to subdivision (a) of Section 13143 is valid, complete, and adequate.

(g) “Henry’s Law constant” is an indicator of the escaping tendency of dilute solutes from water and is approximated by the ratio of the vapor pressure to the water solubility at the same temperature.

(h) “Pesticide” is defined in Section 12753.

(i) “Pesticide registrant” means a person that has registered a pesticide pursuant to this chapter.

(j) “Pollute” means to introduce a pesticide product into the groundwaters of the state resulting in an active ingredient, other specified ingredient, or a degradation product of a pesticide above a level that does not cause adverse health effects, accounting for an adequate margin of safety.

(k) “Pollution” means the consequence of polluting.

(l) “Soil adsorption coefficient” is a measure of the tendency of pesticides, or their biologically active transformation products, to bond to the surfaces of soil particles.

(m) “Soil microbial zone” means the zone of the soil below which the activity of microbial species is so reduced that it has no significant effect on pesticide breakdown.

(Amended by Stats. 2014, Ch. 626, Sec. 1. (SB 1117) Effective January 1, 2015.)