What causes air to get into the lines. It doesn't happen all the time. How do I find and correct this problem.

What causes air to get into the lines. It doesn't happen all the time. How do I find and correct this problem.
We need more details then just that. Pump or city water? If on a pump has the weather been dry lately? What does the air do? Spit acha? Tiny bubbles? Lutsa air when it happens? Any noise? Describe what happens.
Back to you, Tom

I have city water. The air in the line makes the toilet sound like someone has been working on a main somewhere. But my neighbors are not having this problem. And yes there are bubbles because of the air.

The water supply to my home is city water. And yes there are bubbles in the water, caused by the air pressure. The air pressure is very forceful at times, and is present in all my water lines.

Do you have a PRV installed after the water meter, have checked your water pressure?

The range of normal residential water pressure is from 30 to 80 psi. Ideally, the pressure should be set between 45 and 60 pounds in most residential plumbing systems.If the pressure rises too high particularly above 80 psi, plumbing fixtures and appliances (primarily hot water heaters) could be damaged or leak excessively, let us know, Thanks.

John

The water supply to my home is city water. And yes there are bubbles in the water, caused by the air pressure. The air pressure is very forceful at times, and is present in all my water lines.
What's your house pressure? If you haven't a hose bib pressure gage,(see image) then pick one up at your local hardware store and let me know. Do you have a PRV, (pressure reducing valve) installed? Call the water department and ask what the PSI is out in the city main. Has the city done any work out in the street lately? Back to you, Tom

Just a warning: Water meters respond to air as if it were water and there are devices to eliminate the air, but you generally don't need these devices.