Welcome to Just Answer. I will do my best to fully answer your question(s).
There is no way without being there 1st hand that I can tell what is going on. My advice to you is take pictures of EVERYTHING you have described. Bring them to the police so they can look it over. Maybe 1st bring them to a local plumbing contractor for their input would also have more standing with authorities if in fact there is something to your claims. In the mean time I wouldn't drink or use the water.
Thank you for your advice. I will do just that.