855773520-LEED-v5-ID-C-Reference-Guide-Launch-Edition-1 - Page 104
Extracted Content
PATH 3. PROCESS WATER USE
Projects pursuing this path must demonstrate that process water exceeds 10% of the total building-regulated water use, excluding cooling water.
Using alternative water sources, such as captured condensate from air handling units, reduces reliance on fresh water for process systems. Diversifying the water sources on a project site also builds resilience in buildings. This allows projects to divert freshwater for human consumption instead of processes during a water crisis.
When selecting the alternative water source, ensure that the quality of the water is sufficient for its intended use and that the local authority having jurisdiction (AHJ) allows that alternative water source, per local codes and standards.
DOCUMENTATION
| Project types | Options | Paths | Documentation |
|---|---|---|---|
| All | Option 1. Whole Project Water Use | All | LEED v5 Whole Project Water Use calculator. |
| All | Option 1. Whole Project Water Use | All | Contract documents and manufacturer information to support the baseline and proposed water use values in the calculator. |
| All | Option 2. Fixtures and Fittings | All | LEED v5 Fixture and Fittings Efficiency calculator, documenting the fixtures/fittings within and outside of the tenant space. If there are fixtures both within and outside the tenant space, this will be a separate, additional calculator from that submitted for the prerequisite. |
| All | Option 2. Fixtures and Fittings | All | Evidence of any plumbing fixtures and fittings used by the project occupants outside of the tenant space, including flush/flow rates (recommended: product information from the manufacturer, photographs with date/time/location stamp, and/or as-built documents). |
| All | Option 3. Appliance and Process Water | All | Contract document(s) specifying the project’s newly installed commercial washing machines, commercial food waste disposers, commercial laboratory and medical equipment, and/or municipal steam systems and process water equipment, as applicable, including performance specifications. |
| All | Option 4. Optimize Process Water Use | Path 1. Limit Cooling Tower Cycles | Results from the potable water analysis for cooling towers and evaporative condensers. Include the concentration levels for all five parameters listed in Table 8 of the rating system. |
| All | Option 4. Optimize Process Water Use | Path 2. Optimize Water Use for Cooling | Equipment schedule indicating cooling tower type. |
| All | Option 4. Optimize Process Water Use | Path 2. Optimize Water Use for Cooling | Calculation showing the baseline process water use. |
| All | Option 4. Optimize Process Water Use | Path 2. Optimize Water Use for Cooling | Calculation showing the design process water use, including any alternative water savings. |
U.S. Green Building Council LEED v5 Reference Guide for Interior Design and Construction, April 2025 Launch Edition 93