Operator terms · Water
What is a water well?
A water well is a hole drilled into an aquifer to pump groundwater to the surface for use. Wells are the source for groundwater systems, and the operator protects the wellhead from contamination and monitors the water it produces. Well construction and protection are part of the Class D scope.
Last reviewed 2026-08-03
The source for groundwater systems
A well draws water from an aquifer underground. Most groundwater is cleaner than surface water, so systems that use wells often need less treatment.
Protecting the wellhead
Contamination can enter at the wellhead, so operators keep the area clean and sealed and monitor the water for any sign of a problem.
Common questions
- What does a well draw from?
- An aquifer, the water-bearing layer underground.
- Why protect the wellhead?
- It is a point where contamination could enter the supply.
- Do well systems need less treatment?
- Often, because groundwater is usually cleaner than surface water.