I got a weird one here, we moved into a house where we are now on well water. I would say I have water hammering that's occuring, maybe my pressure tank is set to high?

Here are my issues

One of the toilets near the front of the house and directly above the pressure tank, the copper lines do bang alot every time I flush the toilet, I think I need to install a 1/2 water hammer arrestor on the line.

Dishwasher also bangs banging everytime when we use it.

New reno bathroom seems to be fine

Master bathroom is where is weird, toilet bangs multiple times but only happens once. For instance, it bangs on the first flush in the morning only, it is the longest run. I notice under our bathroom is the furnace room so I see all the plumbing, they ran a 3/8 to a reducer 1/2 and then it tees off, I thought I found the banging noise because the 1/2 copper line going to the toilet was hitting a 2x4, I put some foam and it seems to get better but it's still there.

Im wondering if the water pressure is set to high in the house, they made their own water hammer arrestor coming from the pressure tank but I would assume it should be pointing up and not down?

 

Yes, it sounds like you have water hammer. No, your water pressure is not too high. Lowering the pressure might help a bit but I doubt it will get rid of the problem.

 

I would expect the air cushion in a pressure tank on a well system to act like a water hammer arrestor. Perhaps the tank is waterlogged.

Check by trying to release a small amount of air from he Schrader valve (like a tire valve) on the tank. If water comes out then the tank is waterlogged and if a bladder tank the bladder is probably broken. A low air pressure or waterlogging will cause the pump to run more often and for shorter periods (not good.)

In either case you can add air through the Schrader valve. Turn off the pump and reduce the system pressure to zero before pumping air into the tank with a compressor or even a bicycle pump. Add air to the cut-in (low) pressure of your pump switch. The air will eventually get entrained in the water and will have to be replaced regularly. A bladder keeps the air and water separated.

 

When talking about water hammer, it usually occurs when the flush starts or when the refill stops. If you're hearing banging during the refill, it's probably not water hammer, but instead a loose or worn washer in a valve that's causing the water to cavitate.

Usually water hammer occurs more often with electronically switched appliances (washers, dishwashers, etc) as they turn on/off quickly. Toilets are heard less frequently as their mechanism slows down the water flow before turning it off. Not that it can't or doesn't happen, it just happens less often.

 

I'll try to release some air and will report back thanks. Well I know one toilet vibrates during the filling process only when coming to the end. The master toileti is where I hear the banging noise and again when slowing down and coming to a stop, it only happens the first flush of the day early in the morning. My guess it's when water is traveling from the tank all the way across the basement to the toilet. Definitely the washer machine is what you described with a sudden stop and that happenany times during the wash cycle. This is the first time I'm on well, is this normal? I was always on city and sewer utilities.

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Not normal. That is why I suggested checking the pressure tank. You can also check to see if the pump is short cycling--coming on almost immediately when pressure drops and then coming up to full pressure quickly. Pressure tank with proper air cushion will allow pressure to drop slowly and then come up to cut-off pressure again slowly rather than rapid on-off cycles.