Pump stations regulate the pressure in the water mains. 60-80 PSI is normal for around me. In a lower demand area, a water tower is more efficient. They fill the tower with pumps that shut off when the tower is full. As water is used, and the water pressure drops slightly as the level in the tower drops. A 120 ft tower would get you about 60 PSI. The pumps kick on to refill the tower before the pressure drop becomes enough for you to notice.
A fire hydrant is made of cast iron and is roughly 1″ thick. The reasoning for this is not because of the water pressure, but potential damage where they are located. This way you have to strike a hydrant with decent force even with a car to damage it. A common water pipe material is copper, and those lines are only 1/8 of an inch thick. 100 PSI isn’t an incredibly high pressure.
Power generation stations often have pipes with hundreds of pounds of pressure.
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