Shared Well in Granby, MA. Board of Health Being Difficult

I own 2 adjacent parcels of land on one deed in Granby, each parcel with a single family home on it. Long term buy and holds. I want to do a shared well (private water supply), and everywhere I look on the Mass DEP regulations, there are no prohibitions regarding shared wells. Our local Board of Health is saying they will not allow a shared well "Because we say so." There are no bi-laws preventing this currently. My lawyer looked into it. There are also other shared wells in Granby. Where do I go from here? If I could get the approval, I could save around $8000. I don't think I would spend $8000 fighting this seemingly substance-less prohibition.