Forum Title: How to fix reverse water hammer?
There is a single loud bang when the cold water is turned on in the bathrooms or kitchen. I believe this is reverse water hammer. Any way to fix it? I haven't found much on the topic from Googling.
Category: Plumber Post By: KATHERINE ROGERS (Puyallup, WA), 02/13/2016

Have you lived in the house for a while and this is a new sound? Has there been any plumbing work done recently? I've never heard of reverse water hammer so maybe you just mean water hammer. If it's happening when any cold water is turned on in the house the sound could be from a number of things. It could also be a damaged gate valve somewhere on the piping or a failing ballcock on a toilet. This sound only happens when cold water is used or is hot water also hammering? Is it happening when the water is turned on or off or both? Have you checked your water pressure? Do you have a regulator on the water service?

- SARA PRICE (Apple Valley, MN), 09/07/2017

sounds like a loose pipe slapping against a stud when the water turns on

- BECKY ROJAS (Topeka, KS), 09/15/2017

We've lived there for a year, we had major renovations including having most of the house re-plumbed since it was built in the 70s and had a lot of old under slab plumbing. It only happens when the cold water is used, never hot. The sound only happens when the cold water is turned on, a single loud bang/thump sound. We have a pressure regulator and PSI to the house is around 60. How would I know if it's a toilet ballcock causing it? The upstairs guest bathroom toilet sometimes gets stuck in the open position, so if any toilet is failing it would be that one.

- DORIS FLORES (Fall River, MA), 09/28/2017

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