Actually, closer to 4.33 psig.

A cubic foot of water weighs 62.4 pounds, which is a good number to remember.

That 62.4 pounds exerts a pressure on the bottom surface of the cubic foot of :

62.4 pounds divided by 144 square inches, or 0.43333 pounds per square inch.

So the pressure gradient of water is 0.43333 pounds per square inch per foot of water column height, or 0.4333 psi/foot.

The pressure at the bottom of a 10 foot tall tank of water would be 4.333 psi gauge.