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Home > Ag Chemicals & Fertilizers > Fertilizers > Arsenic Concentration Limits in Fertilizer

Arsenic Concentration Limits in Fertilizer

Fertilizer Registrants and Manufacturers

Liquid fertilizer being spread on farm land.As of Aug. 1, 2003 the Minnesota legislature amended Chapter 18C of the Minnesota Fertilizer Law as follows:

"18C.401, Subd.5 The commissioner may not license or register for sale or use in Minnesota any fertilizer containing more than 500 parts per million by weight of arsenic."

The Fertilizer Law provision (18C.401) applies to all fertilizer products. Registrants and manufacturers are responsible to ensure that fertilizer products sold in Minnesota do not exceed the 500 ppm threshold. If a fertilizer product exceeds this limit, it is subject to a Stop-Sale and removal from the state.

All registered and licensed fertilizers submitted for application must include an arsenic self certification in order to be processed by the Minnesota Department of Agriculture (MDA). The MDA may also require verification for certain products containing micronutrients, waste or ash. Arsenic concentrations are verified through a laboratory analysis report using 3050B or 3051A sample prep method as prescribed by the Environmental Protection Agency (EPA).  Arsenic concentration verification via laboratory analysis is required only at the time of initial licensing, registration, or if base raw materials or product sources change. If product composition does not change, an analysis report is not needed at the time of renewal.

MDA Contact

Carol Durden, State Program Administrator
Pesticide & Fertilizer Management Division