{"problem": "High Water Loss (Non-Revenue Water)", "categories": [{"name": "Metering", "color": "#1f77b4", "causes": [{"text": "Inaccurate customer meters", "comment": "Affects billing accuracy"}, {"text": "Missing bulk meters"}]}, {"name": "Illegal Use", "color": "#d62728", "causes": [{"text": "Bypassed meters"}, {"text": "Unauthorized hydrants"}]}, {"name": "Pipeline Integrity", "color": "#2ca02c", "causes": [{"text": "Undetected leaks", "comment": "Leak detection overdue"}, {"text": "Old pipe materials"}]}, {"name": "Monitoring", "color": "#ff7f0e", "causes": [{"text": "Poor SCADA integration"}, {"text": "Infrequent audits"}]}]}