Why Does My Brand New House Have Hard Water Stains Already?

https://www.apu-bookmarks.win/crawl-space-plumbing-access-panels-where-needed-maintenance-access-planning-and-panel-location-requirements-in-st-george-new-construction

St George Hard Water Problems and New Construction Plumbing Challenges Understanding St George Hard Water Issues in New Homes As of April 2024, over 60% of new construction homes in St George are facing unexpected hard water stains