If it is registered as being decommissioned then you are fine.

It's better to decommission them and put in the lease tenants are not allowed to use them.Way too much liability.

At the very least I'll need to get them decommissioned during or soon after due diligence.

I think it's just best I have them get the decommission cert first then move forward.

Maryland gives you 1 year to remove a decommissioned tank.  

Even the old (now decommissioned) SR-71 isn't as fast as time.

We hooked up to sewer before sale once and it was $5000 plus the decommissioning and install fees  of about $4000  that was  like 25 years ago. 

I am not sure what the date is where they stopped putting tanks in the ground but I have looked at several houses where there were tanks in the basement though there was a decommissioned tank underground outdoors.  

The other had that setup but someone had decommissioned it and put a forced air furnace in the attic and flexible ducting to the different areas.

That area is far enough from champaign that it's not treated as a bedroom community, and there are some possible problems with the water from the decommissioned chanute Air Force base.