What is a characteristic of a natural spring?

A natural spring is defined by its ability to release water from underground aquifers, resulting in water flowing to the surface due to hydrostatic pressure. This characteristic of bubbling up under pressure is what differentiates a natural spring from other water sources. The pressure from the surrounding earth and water in the aquifer forces the water upwards, which can create visible activity at the surface, often described as bubbling or geyser-like behavior.

Other factors associated with springs may include their water quality, temperature, and ecological context, but the primary defining feature remains the pressure-driven emergence of water. Unlike man-made sources, which can be built and controlled, natural springs rely solely on geological formations and the natural hydrologic cycle.

While permits may be required for water usage in various contexts, this does not define the spring itself, as permits pertain to human interaction with water sources rather than their natural characteristics. Additionally, the pressure in a natural spring is often substantial enough to be considerable, rather than low, further reinforcing the definition of a spring as an emergent water source driven by subsurface pressure.