Hey there. I live in Maine and ever since the ice storm of '98 we have had water problems that are getting worse. Whenever we turn on our faucets or flush the toilets the water spurts out at a high pressure or the toilet sounds like it will explode. Last week tested the pressure in the pump and found that low so we added more. The problem went away for a few days but is now back full force. we have now dug around the well casing and have located the pipe leading to the well to check for a leak there but cannot tell if the water around it is ground water or a leak. our well goes 385' down and when there is no problems we have good pressure. Any help please want to get this taken care of before the cold weather comes.
If you have a check valve before the pressure tank, a leak in the underground line before that check valve, could very well let air into the system. Remove the above ground check valve. Then you can see if pressure leaks off while no one is using water. Pressure leaking off while no one is using water is proof that you have a leak somewhere.