Definition of mecoprop (MCPP):
Mecoprop has been used as a herbicide since 1960. It is an odourless, white to light brown crystalline solid.  
This is the common definition for mecoprop (MCPP), other definitions can be discussed in the article
MCPP is mainly used to control weeds around cereal crops, apples and pears.
The release of mecoprop to the environment will be primarily from its application as a herbicide, but also potentially from its manufacture, transport and storage. There are no natural sources of release to the environment.
In water is has a low solubility of 0.734 g/l. It has a low tendency to adsorb to organic matter and soils. In water it takes less than a month to half its concentration. 
MCPP has a low potential to bioaccumulate and is therefore not likely to biomagnify. 
Mecoprop causes oysters to die at concentrations above 4 mg/l. Most fish species tolerate concentrations up to 10 mg/l and some even concentrations up to 500 mg/l. 
Environmental standards and legislation
Included in the water framework list of priority substances