Required | 6 possible points
To support water management by minimizing water use and demand as a means to conserve water in the city or community.
Measure the daily per capita domestic water consumption within the city. Domestic water consumption must be calculated for a minimum period of the most recent calendar year. Domestic water is water used for indoor and outdoor household purposes including drinking, cooking, washing, landscaping and sanitation. Domestic water consumption is represented by the amount of water supplied by the public water supply utility or municipality. It may also include some industrial users that receive water from public water treatment facilities rather than well systems. It does not include water withdrawn for non-domestic uses such as agricultural irrigation, golf course irrigation, livestock, aquaculture, mining, or thermoelectric generation. Applicants must include non-revenue water in the calculations. Daily domestic water consumption per capita is calculated by dividing the total water consumed for a minimum period of the most recent calendar year by total population of the city (Use USGBC population calculator based on residing and floating population). Divide this by 365 to get Domestic Water Consumption per capita per day. Document the assumptions for differing day/night and seasonal populations if variations significantly alter water consumption patterns. Obtain a minimum water performance score of 40. Additional points for this prerequisite are awarded for water performance scores above 40, according to table below.
Table 6. LEED Points for Water PerformanceWater Performance Score
The Water Performance Score rates the city or community on per capita domestic water consumption in the city compared to the per capita domestic water consumption by comparable cities and communities. Lesser the amount of per capita domestic water consumption, the higher the score will be. The score is a value from 1-100 based on per capita domestic water consumption.
Performance Score Calculation
To calculate a water performance score, the following data is required:
1. Total domestic water consumption (in million liters or gallons), based on monthly or daily consumption for minimum period of the most recent calendar year.
2. Total population of the city or community. Consider day time and night time population, permanent and floating population for calculations.
References: LEED v4.1 O+M Water Performance STAR v2 BE-2: Community Water Systems, Outcome 2 STAR v2 CE-5: Water Efficiency, Outcome 1: Domestic Water Use Per Capita
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