On Feb 18, 1:58*pm, Eric in North TX wrote:
On Feb 18, 12:48*pm, MC wrote:

Can anyone think of anything else bad that might cause the water level
to be low that could be missed on an internal inspection of the tank?
Thanks

Yes; a leak between the house and the tank causing the liquid never to
reach the tank.

I guess. But that would have to be a huge leak to prevent the
accumulation of 1500 gallons of water in the tank over a 2-3 year
period. Plus we flushed a toilet and saw all of the water come from
the pipe into the tank.