Water is essential to a healthy home—but when it leaks or carries toxins, it can also be one of the most damaging elements. In this module, you’ll learn how to plan and install plumbing systems that are safe, leak-resistant, and compatible with healthy home principles. You'll explore the three phases of plumbing installation, understand the pros and cons of copper vs. PEX piping, and discover smart waterproofing strategies for showers, tubs, and wet areas. You'll also learn how to prevent mold and hidden damage with leak detection systems, catchment trays, and water alarms. Plus, we’ll cover how to test and filter your water based on what it actually contains, and how to choose safe, durable plumbing fixtures and water heaters that fit your home's energy and EMF goals. This lesson is packed with practical insights to help you manage indoor water with confidence.