Bad water pressure (well water)
We live in a 2 year old house with well water. Our water pressure, particularly in the upstairs showers, stinks. It seems to have gotten progressively worse over time. If you run a second source of water with the shower running (ie a faucet), it dribbles out. We have a filtration system, the water has been checked, and all pH/metal levels have been ok. The well guague reads between 40-60psi.
The only thing of note with the well--we had air in the pipes twice last winter that required the well company to come fix a stuck valve. There is no more air in the pipes, but I swear the pressure has been getting worse ever since.
I called the well company and they claim it isn't the well. They say the stuck valve wouldn't cause this problem. The boiler company says its not them.