groundwater

groundwater — noun

1. water that collects and moves through the tiny gaps between soil particles and c

1.nounB2
Definition

water that collects and moves through the tiny gaps between soil particles and cracks in rocks beneath the Earth's surface, forming a natural supply that can be taken from wells and springs

Example

Farmers in the valley use groundwater to water their crops during dry weather.

use groundwater for irrigation — typical agricultural collocation

Élise's study found that the local groundwater had been contaminated by chemicals from old factories.

groundwater contaminated by [pollutant] — common environmental pattern

Common collocations
  • groundwater levels
  • groundwater contamination
  • groundwater extraction
  • groundwater recharge
  • groundwater table
  • groundwater aquifer
  • groundwater depletion
Synonyms
  • subsurface water

    more technical term used in hydrology and geology; less common in everyday conversation

  • underground water

    a plainer, less formal alternative that is often used in news reports

Antonyms
  • surface water

    water found in rivers, lakes, and reservoirs on the Earth's surface

Usage Note

Groundwater is an uncountable noun; do not say 'groundwaters'. To refer to quantities, use phrases such as 'groundwater levels', 'groundwater supplies', or 'groundwater resources'.

Common Mistakes

The groundwaters in this region are clean.
The groundwater in this region is clean.
groundwater is uncountable and takes a singular verb.

Word family

  • water table
    nounB2
  • aquifer
    nounC1
  • surface water
    nounB2
  • groundwater contamination
    noun phraseC1

Synonym discussion

Sense: noun/1

Groundwater, surface water, and rainwater are all sources of fresh water but differ in where they are found and how they behave. Groundwater lies beneath the Earth's surface in the gaps between soil and rock; it is naturally filtered as it moves through underground layers, making it generally cleaner than surface water. Surface water collects in lakes, rivers, and reservoirs — it is exposed to the air, so it evaporates more easily and is more vulnerable to direct pollution from runoff. Rainwater is precipitation that falls from the sky and has not yet soaked into the ground or been absorbed into a body of water; it is typically harvested from rooftops or caught in tanks. For example, a farming community may pump groundwater for drinking, collect rainwater for watering gardens, and use surface water from a nearby river for washing equipment.

groundwater ↗surface waterrainwater ↗

Common collocations

Nouns

  • groundwater levels
  • groundwater supply
  • groundwater resources
  • groundwater contamination
  • groundwater quality
  • groundwater extraction
  • groundwater depletion
  • groundwater monitoring

Adverbs

Phrases

  • groundwater recharge zone
  • groundwater depletion crisis
  • groundwater monitoring station

Prepositions

  • from groundwater
  • of groundwater
  • into groundwater

Etymology

Old EnglishEnglish

Groundwater is a compound word formed from 'ground' (Old English 'grund', meaning the earth's surface or bottom) and 'water' (Old English 'wæter', meaning the liquid that falls as rain). The term began appearing in geological and hydrological writings in the late 19th century as scientists needed a precise label for water stored below the land surface.