Groundwater is the water found underground in the cracks and spaces in soil, sand and rock. According to estimates from the CDC, more than 103 million people living in the U.S. get their drinking water from local water district or private wells. In addition, currently 64% of crops in the U.S. are irrigated by groundwater.

A number of factors have significant implications on groundwater quantity and quality:
  • Drought
  • Over-plumbing
  • Chemical spills
  • Feedlot run-off
  • Pesticide overuse
  • Leaking sewage systems
  • Pharmaceuticals
  • Hydraulic Fracturing (fracking)
In recent years, drought has had the biggest impact on groundwater supplies and quality.


  • Private Well Class, NEHA | Register
    • 10 lessons: One CE each from NEHA
  • Well Owner's Manual, Water Systems Council | PDF
  • Groundwater Fact Sheets, National Ground Water Association | Webpage
  • Source Water Protection, EPA | Webpage
  • Groundwater Rule, EPA | Webpage