What causes a sudden increase in water pressure after using cold water, and why does it remain elevated until water is released from an outdoor hose bib?

The sudden increase in water pressure after using cold water and its persistence until water is released from an outdoor hose bib may be due to a phenomenon called water hammer or hydraulic shock.


When cold water is turned off abruptly, particularly in systems with quick-closing valves, it can create a surge of pressure known as water hammer.


This pressure spike travels through the plumbing system, causing the pressure to remain elevated until it is dissipated.

Releasing water from an outdoor hose bib provides an outlet for this excess pressure, allowing it to dissipate and return to normal levels.

Installing devices such as water hammer arrestors or pressure regulators can help mitigate water hammer and prevent pressure spikes in the plumbing system, ensuring stable and consistent water pressure throughout the home.
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