On May 31, the US EPA published a technical correction affecting the MRL regulation for azoxystrobin.

On May 29, the US EPA published a final rule in the US Federal Register revoking tolerances for the active ingredient difenzoquat.

On April 24, 2013, the US EPA published a final rule in the US Federal Register amending the MRL regulation for the active ingredient azoxystrobin.

On May 1, 2013, the US EPA published a final rule in the US Federal Register amending the MRL regulation for the active ingredient glyphosate.

On May 15, 2013, the US EPA published a final rule in the US Federal Register amending the MRL regulation for the active ingredient spirotetramat.

On May 17, 2013, the US EPA published a final rule in the US Federal Register amending the MRL regulation for the active ingredient streptomycin.

On May 17, 2013, the US EPA published a final rule in the US Federal Register amending the MRL regulation for the active ingredient sulfoxaflor.

On July 17, the US EPA published a proposed rule in the US Federal Register proposing an amendment to the MRL regulation for the active ingredient spi

On July 17, the US EPA published a final rule in the US Federal Register amending the MRL regulation for the active ingredient hexythiazox.

On July 24, the US EPA published a final rule in the US Federal Register amending the MRL regulation for the active ingredient mancozeb.