About Waterville Comprehensive Treatment Center in Waterville, ME Waterville Comprehensive Treatment Center (CTC) offers assistance to adults age 18 and older who are struggling with opioid addiction. Our center uses medication-assisted treatment (MAT) to help people safely withdraw from opioids and remain in recovery. Often, when a person attempts to quit opioids “cold turkey” without professional assistance, they experience highly uncomfortable physical symptoms that can force them to continue using opioids. But with MAT, we combine the use of medications with counseling to address opioid addiction.