Aha, it’s a PC term for a halfway house.
Sober living houses are boarding houses for people in recovery, run by people in recovvery. They work better than an institutional approach because, as the saying goes, you can’t kid a kidder. Usually they are started by someone in the fellowship of AA or NA, but are typically small operations (one or two dwellings, often gender-segregated). They fall under the general idea of long-term treatment, and they have a very good success rate. They are found all over, sometimes in pretty small towns, but definitely in every city in the country (pretty sure, I didn’t actually check every city), there’s even a “chain” called Oxford House.