The various substance abuse treatment programs which are offered to drug addicted persons in Walnut Creek, California can vary in a lot of various ways. Quite a few drug and alcohol abuse treatment programs take place in a residential or inpatient setting, where clients reside the entire time they are in rehab which provides a more conducive rehabilitation environment. Others offer substance abuse rehab services on an outpatient basis which allows for more flexibility, though outpatient facilities may not be a suitable drug and alcohol abuse treatment service for people in Walnut Creek, CA. who are struggling with long term drug addiction issues. Whether or not inpatient or outpatient substance abuse rehabilitation programs are selected, there are varying lengths of time that individuals will be asked to stay in the drug and alcohol rehab center. For example, some short-term programs provide programs for a month or less, whereas long-term centers will require at least a 90 day stay.