Methanol is very soluble in water. If it starts to be used in motor fuel it WILL turn up in the ground water. MTBE, a substance used in small percentages and which isn't extremely soluble in water, has already been causing problems in people's water wells on a fairly large scale.
One of my relatives used to be a physician-narcologist [treating alcoholics] in Vitebsk [Belarus]. Once he was called to head an emergency medical response team - in an industrial setting the workers found a 55 gal [200 liters]drum labeled "methyl alcohol" [i.e. methanol]. The word "alcohol" they understood, the word "methyl" they did not, skull/crossbones they did not believe - and so they [several hundred of them] drank it. Well, if I remember right, my uncle's team managed to save about a hundred of them - but they got blind.