Lake Oswego's housing stock spans more eras than most Portland suburbs: early-1900s Craftsmans in First Addition, ranch and split-level homes through Lake Grove, and 1970s-onward planned construction up Mountain Park and the surrounding hillsides. Water comes from the Lake Oswego–Tigard Water Partnership treatment plant on the Clackamas River, which is a different source profile than Portland's Bull Run — slightly different mineral content, which can shift anode-rod wear and how often a tank needs flushing. We come prepared for both, and we bring a diagnosis-first read on whether a repair is worth doing or a replacement is overdue.