Built by someone who has done the work
GemState is a Treasure Valley residential-habilitation agency founded and run by Cass Neilson, who has spent his career in Idaho's developmental-disability community.
Who we are
GemState Residential Habilitation is a Treasure Valley agency providing 24-hour-capable, person-centered support for adults with developmental disabilities. We were not started by an investor or a management company. We were started by someone who has spent almost three decades in the homes, on the overnights, doing the work itself.
GemState ResHab, LLC (gemstatereshab.com) is independently owned and is not affiliated with Gem State Residential Habilitation (gsreshab.com).
Our mission is simple: help each person we serve live in a real home of their own, in the community they know, and grow toward their own peak of independence.
Meet Cass Neilson, founder and administrator
Cass first stepped into direct support at eighteen, and in the 28 years he has spent in Idaho's developmental-disability field since then, he has worked at agencies in Idaho Falls and the Treasure Valley, moving from direct support into senior direct-support roles, training new staff, running households, and mentoring the people who do this work. He stepped away for other jobs at times, trucking and security among them, and always came back. The DD field is where the work actually meant something to him.
"I wanted to build the agency I always wished I worked for."
He meets Idaho's experience standards to serve as an agency administrator. More than any credential, though, what he brings is a long, hands-on understanding of what good care looks like from the inside, and what it looks like when it falls short.
Cass also writes the family guides on this site, because he has watched too many families get lost in the paperwork and wants the path to be clearer than it was for the people he has helped over the years.
How we think about care
Good care is not one relationship, it is three working together. When a company genuinely takes care of its staff, staff can give the people they support their full attention, and that is when participants truly thrive. We build around that whole triangle, not just one corner of it.
Honesty you can verify
GemState is built to Idaho's 2026 residential-habilitation standards (IDAPA 16.03.21) and was certified by the Idaho Department of Health and Welfare on July 20, 2026. Idaho law does not allow any agency to provide services before it is certified, and we will always show you exactly where we stand.
Our certificate: No. RHA-6337, an Initial certificate, the standard first certificate every new agency receives. Verify it right now with the Idaho DHW Division of Licensing and Certification at 877-457-2815 or DDARH@dhw.idaho.gov. Our own provider guide tells families an Initial certificate is a reason to ask more questions. So ask us. We will answer.
Where we serve
GemState serves the Treasure Valley: Boise, Meridian, Nampa, and Caldwell, across Ada and Canyon counties.