Where has it been detected?

A:

In 2012 Friends of the Earth attempted to determine which were the most commonly detected pesticides on Australian food (*3). Chlorpyrifos and Chlorpyrifos Methyl (*4) were the second and fourth most commonly detected pesticides. Chlorpyrifos was also the most commonly detected pesticide detected on food imports at this time, particularly on peanut products imported from China. 

(*3) The Dose Makes the Poison, Friends of the Earth (accessed here)

(*4) There are 13 registered products containing Chlorpyrifos Methyl in Australia. Chlorpyrifos Methyl is used as a control for insects in stored grain and lupins (except for maize, malting barley and rice) and on surfaces of buildings, bins and machinery used for grain storage (except rice).

Chlorpyrifos has also been detected in many different locations across Australia, including waterways and drinking water catchments.  See map here.

Chlorpyrifos has been linked to a number of fish kills and has been detected in many waterways across Australia. Chlorpyrifos has a remarkably low ecological water guideline of 0.00004 parts per billion, meaning that even at levels this low, it can have an ecological impact on freshwater ecosystems.