To me, sounds like there's a problem with the faucet. Connected to the CG water supply you should be able to shut all faucets off (just like home) even if the water pressure is too high. High water pressure will most likely cause leaks or pop a crimped connection in the plumbing. A regulator is a good idea, Wally world sells them as do most RV parts places.
2013 F-350 CC SB 2WD 6.7PS
2013 Eagle Premier 351 RLTS
-SOLD- 2012 X23B
-SOLD- 2003 Ford Expedition 5.4, Bilstein shocks