The amount of water supplied to my house by the well, pressure tank, etc. is deteriorating. I used to be able to run a sprinkler outside and run the washing machine or fill a bathtub inside without any problems. A little while ago, I found that after running the sprinkler for a little while, the amount of water pressure to the sprinker deteriorates over time (15 to 20 mintues) and I can't really run any other water with meaningful supply while the sprinker is running. Is there a problem with my pressure tank, the pressure switch, well pump? How do I diagnose & fix?

What type of pipes do you have? Copper, plastic or galvanized? How old? What does your pressure gage show when the pump is up to pressure? Regards, Tom