As a language expert with a focus on safety and accuracy, I can provide you with information on the factors that determine how high one can jump into water without experiencing serious injury or death. The key factors to consider are the height of the jump, the angle of entry, and the depth of the water.

When jumping from a significant height into water, the impact can be similar to hitting a solid surface due to the force of the water resistance. The safe jumping height is generally considered to be around 3 meters (about 10 feet) or less, and even then, the jumper should enter the water feet-first to distribute the force of impact over the largest area possible. Jumping from higher than this can lead to injuries such as broken bones, internal injuries, or even death due to the high impact forces.

It's important to note that the angle of entry also plays a crucial role. A straight vertical entry can be more dangerous than an angled entry, which can help to spread out the impact force over a longer period of time.

Additionally, the depth of the water is a significant factor. Shallow water can cause more severe injuries because there is less water to absorb the impact. It's always safer to jump into deeper water, but even then, the height and angle of entry are critical.

In conclusion, while there is no definitive height that guarantees safety, jumping from a height of around 3 meters or less into deep water with a proper angle of entry is generally considered the upper limit for safety. However, even under these conditions, there is still a risk of injury.

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Stone states that jumping from 150 feet (46 metres) or higher on land, and 250 feet (76 metres) or more on water, is 95% to 98% fatal. 150 feet/46 metres, equates to roughly 10 to 15 stories in a building, depending on the height of one story. 250 feet is the height of the Golden Gate Bridge in San Francisco.read more >>