I live in Illinois, and I'm trying to look up the Plumber License of a plumber with whom I am having an issue. In Illinois, the agency that licenses plumbers is the Illinois Department of Public Health (IDPH). The following is the IDPH database of licensed plumbers: https://plumblicv5pub.dph.illinois....erification/Plumber_License_Verification.aspx On the website of the plumber's plumbing company, is the company's Illinois Plumber License number, a number that begins with "055". I entered that number into the "License ID" field on the database website, and nothing came up. I then typed into the "Business Name" field, the first three letters of the company's name, followed by *. This was supposed to show me all licensed companies whose names begin with the three letters. A list of eight companies showed up, and none of these eight companies is my plumber's plumbing company. I then typed my plumber's last name into the "Last Name" field. This last name is a very unique Eastern European last name. I got one hit. It was a plumber with the same last name, but with a very different first name. So, what's going on here? Is my plumber licensed? Is his company licensed? Is the IDPH database malfunctioning? Thanks for any info.