How can I make my brother in law move his leachfield off my lot?

Carri,   Obviously, the first problem that you have here is that you allowed your Mother, the former owner, to place the leach field on your property.  But, now that someone else owns the property, your brother, you want the leach field either removed or you want compensation. The issue here is that you have provided the previous owner an easement on your property, but did the easement automatically transfer with the property or must the new owner craft a new agreement with you to maintain the easement?  This question will only be answered with a more indepth factual analysis.  Do you have any written agreement?  Did you make any agreement with you brother?  Can the leach field physically be located on your brother's property? I offer a free consultation and would be happy to discuss this matter with you in more detail if you will call me office and schedule an appointment.  Call 303-688-0944 and ask for Don.