Katayamazu Onsen Hainyuso is a thermal distribution facility completed in 1987 in Katayamazu, Kaga City, Ishikawa Prefecture. Designed by Bunka Environment Planning Institute, this structure serves as essential infrastructure for the hot spring resort community. Beyond its primary function as an equipment facility managing water distribution, the building also incorporates commercial and social education spaces. The facility represents a thoughtful integration of utilitarian design with community-oriented functions, demonstrating how infrastructure buildings can contribute meaningfully to the cultural and economic vitality of a traditional hot spring town while maintaining practical efficiency.