There are a few reasons...why you suddenly have water hammer ⤵️ - changes in your plumbing system that disrupt the flow of water - a recently installed appliance, like a washing machine or dishwasher, that uses quick-closing valves - rise in water pressure or changes made to your plumbing system such as valve replacements or pipe modifications - air chambers or water hammer arrestors become waterlogged or ineffective If you're experiencing a sudden water hammer, it's advisable to consult a quali