About Coastal Comprehensive Treatment Center in Wilmington, CA Coastal Comprehensive Treatment Center (CTC) is a safe and welcoming facility where adults can receive personalized outpatient care for opioid addiction. Our center in Wilmington, California, serves adults age 18 and older of all genders. We offer medication-assisted treatment, or MAT, which incorporates medication and therapy to prepare adults for long-term recovery from opioid addiction. MAT has been closely studied for years, and it has a documented history of effectiveness. Years ago, most methadone clinics typically offered one type of medication.