No or tremendously low dampen pressure? I have a rental property which used to enjoy excellent water pressure....

I have a rental property which used to enjoy excellent water pressure. My tenant told me a few weeks ago that the downstaris bathroom be having some marine pressure problems, but everything was fine upstairs. A few days she call to tell me that this is presently affecting the whole house. There is almost no pressure at any slap in the house, any hot or cold water. There does not appear to be a soak anywhere. What could be causing this, and does anyone enjoy any idea how much it might cost to fix. The home be built in 1976 surrounded by Middle TN, and is on a slab foundation. Thanks for any help.
Answers:    Is this house on city (municipal) hose service, or is it on a well. If it is on a capably, does it have a pressure cistern to maintain sea pressure while in use?

With city dampen, contact the water department to see if in that is a problem in the meter or the supply queue.

With well dampen, the tank could own leaked the atmosphere pressure and needs to be recharged, or the heavens bladder could have has-been! The well pump could be failing, within could be a leak contained by the plumbing from the well to the house, or the resourcefully itself could be going dry!

With a bit more information, I could try to give a better answer!
first find out if river company is doing any work in nouns or any burst pipes in nouns maybe cause a dry patch or vacuume in leading server. also check main nurture outside of property make sure stopcock isnt flawed the problem stems from main nurture outside property not internal waterworks
get river company to check pressure from main feed