Lead-Free, Audit-Ready: The Single Job-File That Protects Your Plumbing Business With the lead-free WaterMark transition accelerating and auditors zeroing in on evidence-of-suitability and Certificates of Compliance (CoC), small plumbing businesses need tighter environmental and WHS record-keeping. Here’s a practical, real-world path to get audit-ready without slowing the job down. 1) Introduction: The Audit Wake-Up Call