Groundwater contamination means that the water underground has become dirty or unsafe to drink or use.
You can think of the ground like a big sponge that absorbs water when it rains or snows. This water is called groundwater and it’s what many people use for drinking or watering plants.
But sometimes things we put in the ground can seep into the sponge and pollute the water. These things might be chemicals from factories, pesticides from farms, or even waste from people’s homes.
When this happens, the water can become dangerous because the chemicals or waste can make people sick if they drink it or use it to water their plants.
It’s important to keep the groundwater clean by being careful about what we put into the ground. Sometimes we have to clean up the water if it gets contaminated so that people and animals can stay healthy.