Overall Rating	Gold
Overall Score	71.21
Liaison	Lisa Noriega
Submission Date	June 29, 2022

STARS v2.2

Yale University
OP-21: Water Use

Status

Score

Responsible Party

2.12 / 4.00

Lisa Noriega
Sustainability Data Analyst
Yale Office of Sustainability

"---" indicates that no data was submitted for this field

Level of ”Physical Risk Quantity” for the institution’s main campus as indicated by the World Resources Institute Aqueduct Water Risk Atlas:

Low

Part 1. Reduction in potable water use per person

Total water withdrawal (potable and non-potable combined):

	Performance Year	Baseline Year
Total water withdrawal	500,297,528 Gallons	570,159,522 Gallons

Potable water use:

	Performance Year	Baseline Year
Potable water use	500,297,528 Gallons	570,159,522 Gallons

Start and end dates of the performance year and baseline year (or three-year periods):

	Start Date	End Date
Performance Period	June 1, 2020	May 31, 2021
Baseline Period	June 1, 2012	May 31, 2013

If end date of the baseline year/period is 2004 or earlier, provide:

A brief description of when and why the water use baseline was adopted:

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Figures needed to determine "Weighted Campus Users":

	Performance Year	Baseline Year
Number of students resident on-site	2,434	4,679
Number of employees resident on-site	71	50
Number of other individuals resident on-site	73	150
Total full-time equivalent student enrollment	11,982.50	11,906
Full-time equivalent of employees	15,652	13,733
Full-time equivalent of students enrolled exclusively in distance education	0	0
Weighted campus users	21,425.13	20,561.50

Potable water use per weighted campus user:

	Performance Year	Baseline Year
Potable water use per weighted campus user	23,350.97 Gallons	27,729.47 Gallons

Percentage reduction in potable water use per weighted campus user from baseline:

15.79

Part 2. Reduction in potable water use per unit of floor area

Gross floor area of building space:

	Performance Year	Baseline Year
Gross floor area	17,682,608 Gross square feet	16,200,000 Gross square feet

Potable water use per unit of floor area:

	Performance Year	Baseline Year
Potable water use per unit of floor area	28.29 Gallons per square foot	35.20 Gallons per square foot

Percentage reduction in potable water use per unit of floor area from baseline:

19.61

Part 3. Reduction in total water withdrawal per unit of vegetated grounds

Area of vegetated grounds:

	Performance Year	Baseline Year
Vegetated grounds	325.70 Acres	325.70 Acres

Total water withdrawal per unit of vegetated grounds:

	Performance Year	Baseline Year
Total water withdrawal per unit of vegetated grounds	1,536,068.55 Gallons per acre	1,750,566.54 Gallons per acre

Percentage reduction in total water withdrawal per unit of vegetated grounds from baseline:

12.25

Optional Fields

A brief description of the institution's water-related behavior change initiatives:

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A brief description of the institution's water recovery and reuse initiatives:

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A brief description of the institution's initiatives to replace plumbing fixtures, fittings, appliances, equipment, and systems with water-efficient alternatives:

Initiatives to replace plumbing fixtures, fittings, appliances, equipment, and systems with water-efficient alternatives (e.g., building retrofits):
Yale has a goal to reduce potable water use by 5% from 2013 to 2020. A key initiative towards the water reduction goal involved replacing existing showerheads within Yale’s 12 residential colleges and athletic facilities with high-performance, low-flow showerheads. Water use data shows the impact of this initiative. Potable water use decreased by 12% at Yale’s twelve Residential Colleges and 13% at Payne Whitney Gym between FY2013 and FY2016. Another initiative involved various strategies to minimize cooling tower water demand during peak cooling months. Water use data shows that the overall annual total water use at power plants decreased by 5% between FY2013 and FY2016.

Website URL where information about the institution’s water conservation and efficiency efforts is available:

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Additional documentation to support the submission:

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Data source(s) and notes about the submission:

Total water withdrawal is represented by our utility water, which represents approximately 95% of our total water withdrawal (and which is the only data that we have available). This also accounts for the FY13 total and potable figures appearing equal.

Employees resident on-site and number of other individuals resident on-site are estimations for baseline year.