Located in Gurnee, IL, Lake County Methadone Treatment Center specializes in the treatment of opiate addiction with professional detoxification, methadone maintenance and methadone detoxification services. Â We can help you address Heroin, Oxycodone, Hydrocodone, Morphine, OxyContin, Percocet, Lortab, Roxicodone or Fentanyl addictions with confidence.