Is stealing water by connecting pipes from outside the meter considered one of the hudud punishments that necessitates cutting off the hand according to Sharia, knowing that the companies owning the water are private and joint-stock with the government?

The trick mentioned for taking water without paying for it is an aggression and an unlawful consumption of people's property, whether the company is private or public. It does not entail cutting off the hand, nor is it considered theft in its specific meaning; rather, it is a forbidden trick. The aggressor is liable for what he took towards the company.