Can I take away laundry room?

[Shayna Adams]

Hello!

We have a triplex in Missoula, MT, and have had repeated issues with tenants not caring for the shared laundry room.  Actually that's an understatement...  It's happened twice now that one of the tenants has left the door to the laundry room open, causing the entire room to freeze (it's winter in Montana...).  I have actually found the door left open dozens and dozens of times, but it's only caused frozen pipes and major water damage twice.  It happened again last night when there were sub-zero temps, and we are currently waiting for the pipes to thaw to see if any pipes are broken.  The property is on a private well, and the well pump/pressure tank is also housed in the laundry/utility room.  Currently all incoming and outgoing water lines are frozen solid.  If the well pump were to break from freezing damage it would be thousands of dollars to replace.  

The laundry room is something we added after we purchased the property 2 years ago.  We inherited 2 of the 3 tenants with the purchase and they've all been great other than this one recurring issue.  That being said, the machines are mentioned as "included appliances" on 2 of the updated leases.  One of the tenants is still on an old lease that has rolled over to month-to-month, and it makes no mention of the machines (after some investigating it seems that it's THEM that has continually caused this damage).  

Am I obligated to maintain all the tenants access to the shared laundry if they continually destroy it and cause thousands of dollars of damage?  The consequence of this event from last night is that the entire property is without water until the lines are thawed and the damage can be assessed and repaired.  Am I right in assuming my right to mitigate damage and respond to recurring issues trumps any responsibility I might have to maintain access to shared laundry machines?  Would love any thoughts.