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Turning on one faucet will cause a pressure drop at any other faucet that is running, but you say it is a "significant" drop - that implies that you have low water pressure, period. You might to consult with a plumber to see if anything can be done - if you live in a house with very old steel Plumbing pipes, replacing them can make a noteworthy difference (it's not cheap, of course).

Or possibly, you have an unusually low pressure system, perhaps a gravity feed system. Installing a water pump will solve any inconvenience, such as the shower almost quitting when a toilet is flushed elsewhere.

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Q: Why does turning on one faucet cause significant pressure loss in every other faucet in the house?
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