LEED Certification



Let Wahaso – Water Harvesting Solutions help you earn LEED v4 points on your green building project! Many building owners interested in water harvesting are also considering LEED certification for their project. As a U.S. Green Building Council member, Wahaso is a strong advocate of green building practices and can support efforts by clients wishing to achieve green building certification for their project.

As of November 1, 2016, all projects now need to be registered under LEED v4. The good news: LEED v4 increases the focus and value of water conservation efforts. With this new version, projects can now earn up to 15 LEED points for water conservation efforts alone. Wahaso can work with you to identify all possible on-site water sources and uses, and can then design a unique harvesting system to help you earn the maximum amount of LEED points for conservation efforts.

The LEED (Leadership in Energy and Environmental Design) Green Building Rating System was devised as a voluntary, consensus-based national standard for developing high-performance, sustainable buildings. LEED was initially created by the U.S. Green Building Council (USGBC) to establish a common measurement to define “green building.” It has since grown into a program aimed at raising awareness of and promoting integrated “green” building projects.

Projects seeking LEED certification earn points across nine categories addressing sustainability issues, such as sustainable sites and water efficiency. Depending on the number of points earned, projects are awarded one of four levels of LEED certification: Certified, Silver, Gold, and Platinum.

How is water harvesting important in a “green” building? Water harvesting touches on many of the principles embodied in LEED certification. These include:

  • Conserving water
  • Reducing energy consumption
  • Reducing the depletion of natural resources and materials
  • Creating a sustainable site
  • Use of innovative design

On average, LEED-certified buildings use 30% less water than a conventional building, which translates to about 1-3 million gallons of water saved per year. Reducing the amount of water that needs to be treated by municipal waste water treatment facilities also reduces pumping and process energy required to these systems.

LEED certification promotes on-site storage and use of rainwater and greywater through water harvesting to lower water consumption cost, as it reduces the impact on storm drainage and municipal treatment systems. Water harvesting efforts can earn a significant number of LEED points across several categories.

For more information, download our free information sheet: wahaso-supports-leed-v4-1


Water Efficiency Credits:

Credit 1: Outdoor Water Use Reduction (2 points)
  • Option 1: No irrigation required. Show that the landscape does not require a permanent irrigation system beyond a maximum two-year establishment period.
  • Option 2: Reduced irrigation. Reduce the project’s landscape water requirement by at least 30% from the calculated baseline for the site’s peaking watering month.
Credit 2: Indoor Water Use Reduction (6 points)
  • Earn 1 point for a 25% reduction in indoor water usage, 2 points for a 30% reduction, 3 points for 35%, etc., all the way up to 6 points for a 50% reduction.
Credit 3: Cooling Tower Water Use (2 points)
  • For 2 points, maximum number of cycles achieved without exceeding any filtration levels or affecting operation of condenser water system (up to maximum of 10 cycles).
  • For 3 points, achieve a minimum 10 cycles by increasing the level of treatment in condenser or make-up water, OR achieve the number of cycles for 1 point and use a minimum 20% recycled nonpotable water.
Credit 4: Water Metering (1 point)
  • Install permanent water meters for the following water subsystems, as applicable to the project:
    • Irrigation. Meter water systems serving at least 80% of the irrigated landscaped area. Calculate the percentage of irrigated landscape area served as the total metered irrigated landscape area divided by the total irrigated landscape area.
    • Indoor plumbing fixtures and fittings. Meter water systems serving at least 80% of the indoor fixtures and fitting described in WE Prerequisite Indoor Water Use Reduction, either directly or by deducting all other measured water use from the measured total water consumption of the building and grounds.

Sustainable Sites Credits:

Credit 4: Rainwater Management (3 points)
  • Implement the following strategies to reduce the annual volume of rainwater runoff from the existing site’s baseline condition:
    • Use Low Impact Development (LID) practices to capture and treat water from 25% of the impervious surfaces from 1.2” (30 millimeters) of rainfall.
    • Rainwater collection system capturing and reusing 25% of the runoff from impervious surfaces.

Integrative Process Credit:

Beginning in pre-design and continuing throughout the design phases, identify and use opportunities to achieve synergies across disciplines and building systems described below. Use the analyses to inform the owner’s project requirements (OPR), basis of design (BOD), design documents, and construction documents. Worth one (1) point.

If you are not already working with a LEED Accredited Professional (LEED AP) on your project, we encourage you start there. For a directory of LEED AP’s check here. Your LEED AP will provide the consultative support needed to work through the certification process.

We encourage you to focus on water use reduction for your project. Wahaso can help you evaluate water sources and uses that are unique to your project and develop a strategy to maximize water savings inside and outside the building. To learn more about how Wahaso can help you meet your water conservation goals, contact us today.