[hedgetrimmer]

How many teams of lawyers would it take to 'prove' my neighbor contaminated my water supply?

None. Do you have a map of your property? Does it show water from your neighbor runs onto your land? Does a sample of the neighbors water show contamination before it enters your property? Doesn't take any lawyers to figure that one out.

[GreenFreeper]

Doesn't take any lawyers to figure that one out.

You'd think that but that is rarely the case. There is a landfill in the area near my work that illegally handled toxic waste. This contaminated ground/drinking water supplies with contaminants like arsenic, lead, mercury, etc. as well as several tributaries, and a great lake. It's been 5+ years of litigation and still the case has yet to be decided.