Misbranded or adulterated fertilizer, soil conditioner or soil amendment; distribution of unregistered fertilizer.
Wyo. Stat. Ann. § 11-14-109
in effect(a) No person shall distribute misbranded fertilizer, soil conditioners or soil amendments. A commercial fertilizer, soil conditioner or soil amendment is misbranded if:
(i) Its labeling is false or misleading in any particular way, including being labeled organic fertilizer, when its use is not allowed pursuant to the United States department of agriculture "National List of Allowed and Prohibited Substances" rule;
(ii) It is distributed under the name of another fertilizer, soil conditioner or soil amendment;
(iii) It is not labeled as required in W.S. 11-14-105 and in accordance with regulations prescribed under this act.
(b) No person shall distribute an adulterated fertilizer, soil conditioner or soil amendment. A commercial fertilizer, soil conditioner or soil amendment is adulterated if:
(i) It contains any deleterious or harmful ingredient in sufficient amount to render it injurious to beneficial plant life when applied in accordance with directions for use on the label, or if adequate warning statements or directions for use which may be necessary to protect plant life are not shown upon the label;
(ii) Its composition falls below or differs from that which it is purported to possess by its labeling;
(iii) It contains unwanted crop seed or weed seed; or
(iv) A commercial fertilizer that contains guaranteed amounts of phosphates or micronutrients, contains metals in amounts greater than the levels of metals established by the following table:
Metal
ppm per 1% P2O5
ppm per 1% micronutrients
Arsenic
13
112
Cadmium
10
83
Cobalt
3,100
23,000*
Lead
61
463
Mercury
1
Molybdenum
42
300*
Nickel
250
1,900
Selenium
26
180
Zinc
420
2,900*
(* only applies
when not
guaranteed)
The table shall be used according to the following three (3) situations:
(A) For fertilizers with a phosphate guarantee, but no micronutrient guarantee, multiply the percent guaranteed P2O5 in the product by the values in the table to obtain the maximum allowable concentration of each metal. The minimum value for P2O5 utilized as a multiplier shall be six (6.0);
(B) For fertilizers with one (1) or more micronutrient guarantee, but no phosphate guarantee, multiply the sum of the guaranteed percentages of all micronutrients in the product by the value in the appropriate column in the table to obtain the maximum allowable concentration (in parts per million, or ppm) of each metal. The minimum value for micronutrients utilized as a multiplier shall be one (1);
(C) For fertilizers with both a phosphate and a micronutrient guarantee, multiply the guaranteed percent P2O5 by the value in the appropriate column. The minimum value for P2O5 utilized as a multiplier shall be one (1). Then, multiply the sum of the guaranteed percentages of the micronutrients by the value in the appropriate column. The minimum value for micronutrients utilized as a multiplier shall be one (1). Then, utilize the higher of the two (2) resulting values as the maximum allowable concentration (ppm) of each metal.
(c) No person shall distribute unregistered fertilizers, soil conditioners or soil amendments.
(d) No person shall distribute fertilizers, soil conditioners or soil amendments that are short weight. All provisions for enforcement of items found to be short weight shall be administered by the department under W.S. 40-10-117 through 40-10-136 of the weights and measures law.
(e) Any penalties resulting from violations of these heavy metal standards shall accrue to the registrant of the material that violates the heavy metal standard.
Source: WY Statutes (Official Site)URL: https://wyoleg.gov/statutes/compress/title11.pdfFetched: 10/4/2026