Find a Plumber in Illinois

Under the Illinois Plumbing License Law (225 ILCS 320), the Department of Public Health issues credentials for apprentice plumbers, plumbers, and plumbing contractors, and every plumbing contractor must also register with the state each year. For homeowners, that means a statewide authority to check a pro's standing against, with Chicago also licensing plumbers and plumbing contractors through its own Board of Plumbing Examiners.

• Authority. Illinois Department of Public Health (IDPH)
• License structure. apprentice plumber / plumber / plumbing contractor (annual registration); also retired plumber and irrigation contractor
• Worth knowing. Under the Illinois Plumbing License Law (225 ILCS 320), IDPH licenses plumbers, plumbing contractors and plumbers' apprentices, and all plumbing contractors must register with the state and pay an annual fee.

Checked against the official source, September 2026: dph.illinois.gov. License verification against sources like this is how a pro enters matching on CopperMain. A request never reaches an unverified one.

Chicago-area winters bring deep frost and true burst-pipe risk; across Illinois, winterizing hose bibs, heating vulnerable pipe runs, and knowing where the main shutoff sits all earn their keep. On water chemistry, Chicago's Lake Michigan supply runs about 137 mg/L (8 gpg), which is hard: enough that water heaters and faucet aerators collect mineral deposits year after year. Other utilities' numbers vary.

• Drain Cleaning
• Water Heater Repair
• Sewer Line Repair
• Septic Tank Pumping
• Leak Detection & Repair
• All services →

City guides cover how plumbing is regulated locally: licensing, permits and water conditions. They are information pages, not coverage listings.

• Chicago

City guides above cover licensing, permits and water conditions. For the job itself, describe the problem and your ZIP: a license-checked plumber who covers your area gets the details and contacts you with next steps and a quote.