Approximately 7,000 new water wells are constructed and 2,000 abandoned wells are sealed in Illinois each
year. A major consideration in constructing these wells is to prevent contamination form the ground surface or
shallow ground water, sewage disposal systems and other hazardous sources, from entering the well. To ensure the
safety of these water supplies, the division and local Health Departments review water well installation plans,
issue permits for new well construction and inspect wells.
It has been established by scientific evidence that improperly constructed water wells can adversely affect
the publicís health. The private water program approves the location, construction, modification, and sealing of
all water wells in an effort to protect the public health.
Sampling Private Water Supplies
Request for Water Sampling
Private Labs (PDF File)
Commonly Found Substances in Drinking Water and
Available Treatment (PDF File)
Storing and Disinfecting Water Supplies
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