In an effort to make drug and alcohol treatment is available to persons with co-occurring psychological disorders, Partial Hospitalization drug and alcohol treatment programs in Williamstown, NJ. can supply treatment in certain hospital and mental health hospital facilities for clients in need of treatment. Partial Hospitalization the name for this type of drug rehabilitation facility, because the treatment client will undergo drug and alcohol treatment during the day and returns home at night for about seven days a week. This is why these drug and alcohol rehab facilities are also referred to as Day Treatment. Partial Hospitalization drug and alcohol treatment programs help clients deal with drug addiction disorders and mental health disorders simultaneously so that treatment staff can make sure that the individual won't fall back into drug use the moment drug and alcohol treatment is finished.