Over the last 15 years there has been a disturbing increase in high damage litigation arising from severe corrosion in mid-rise and high-rise building HVAC plumbing systems. A recurring theme in these instances is the lack of comprehensive water treatment specifications. In the absence of such specifications, critical omissions of necessary tasks relating to water treatment are condemning the building HVAC piping to severe corrosion very early in the life of the assets. These instances are being exacerbated by the confluence of rising labor/material costs, the availability of inexpensive, poor quality, offshore piping, and the legacy of environmental restrictions on the available corrosion inhibiting chemistry. This publication identifies common scenarios with the objectives of planning for success and managing exposure.