IL Well Driller study guide
IL Well Driller · Work through your exam, one topic at a time.
The Illinois Water Well Driller credential is administered in a state whose drinking-water oversight sits with the Illinois Department of Public Health (IDPH), the agency that publishes the department's environmental health protection, licensing and certification, and laws and rules material. This page is an independent study resource for candidates preparing for that licensing exam; it is not affiliated with, endorsed by, or operated by IDPH or the State of Illinois. The IL Well Driller study guide has 4 sections and about 1,369 words.
01Water Well Construction, Drilling Methods, and Equipment
This domain tests whether you can choose a drilling method and equipment string that fit Illinois geology and then build a well that seals out surface contamination. The exam favors practical reasoning: method versus formation, casing and screen design, and grouting as part of construction, not an afterthought.
361 words, about 2 min02Well Siting, Setback Distances, and Grouting/Sealing Requirements
This domain tests the minimum distances that keep a well away from contamination and the sealing work that keeps surface water and shallow groundwater from moving down the annulus. Illinois sets statewide minimums; local ordinances may be stricter but cannot be looser.
322 words, about 2 min03Well Development, Disinfection, Pumping Equipment, and Abandonment
This domain tests what happens after the hole is drilled: removing drilling fluids and fines, disinfecting the well, selecting and setting the pump, and sealing a well that is no longer used. The exam wants sequence and verification, not just a list of tools.
343 words, about 2 min04Illinois Water Well Construction Code, Licensing Rules, and Public Health Protection
This domain tests the legal side of drilling in Illinois: the Water Well Construction Code (77 Ill. Code 920), the Water Well and Pump Installation Contractor's License Act (225 ILCS 115), and the public health rationale behind both.
343 words, about 2 min