Plumber License Requirements in Illinois
License RequiredLast verified March 9, 2026
Agency And Exam
Issuing agency: Illinois Department of Public Health
Official licensing agency website
Exam provider: Not listed
Reciprocity And License Levels
License levels
PlumberPlumbing ContractorPlumber's ApprenticeIrrigation ContractorRetired Plumber
Reciprocity states
None listed
Notes
Illinois licenses plumbing through the Department of Public Health. Official IDPH materials state that the Department licenses plumbers, plumbing contractors, plumbers' apprentices, irrigation contractors, and retired plumbers, and that initial plumber applicants must work under a licensed plumber and pass a state licensing exam. Verified against Illinois plumbing licensing materials on 2026-03-09.