Tomaat,if you are looking to grow your own carrot seed and you have wild carrot in close proximity you are going to need pollen nets,how they are managed im a bit unsure, hopefully others here may have some info.
I`m quite fortunate to live in a near wild carrot free area,all i have is one roadside patch about 2kms away that every summer i spray out,this patch should be eradicated in the next year or so, i hope,and is probably far enough away that contamination is highly unlikely but if it were to be eradicated, the nearest is about 16 kms from here
