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Water Efficiency Benchmarks

Overview

Singapore's non-domestic sector uses about 55% of its current water supply and this is projected to increase to 70% of its future water demand by 2060. To manage non-domestic sector water efficiency, PUB introduced the Mandatory Water Efficiency Management Practices (MWEMP) in 2015.

Under MWEMP, large water users have to submit details of their water consumption, business activity indicators and water efficiency plans to PUB annually. With these collected data, PUB is able to develop sectorial water efficiency benchmarks for office, retail, hotel, wafer fabrication and semiconductor. 

How is WEI calculated?

The Water Efficiency Index (WEI) serves as the performance indicator for water efficiency, and refers to the amount of water used per business activity indicator.

WEI = Total amount of water consumed / Business activity indicator

Sectorial water efficiency benchmarks

The sectorial water efficiency benchmarks are tabulated based on water consumption data in 2016.

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Water Efficiency Benchmark Table

Hotel benchmarks

For the hotel sector, WEI is computed using the annual water consumption of a hotel divided by number of its occupied guestrooms in the same year. This index reflects the amount of water a hotel used for its operations per occupied room daily.

For more details about hotel benchmarks, click on image to download [PDF]. 

Water Efficiency Benchmark Hotel
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Office building benchmarks

For the office building sector, WEI is computed using a building's annual water consumption divided by its gross floor area of the building. This index reflects the amount of water used for its operations for each gross floor area annually.

For more details about office building benchmarks, click on image to download [PDF].

Water Efficiency Benchmark Office
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Retail benchmarks

For the retail sector, WEIs are computed using:

1. annual water consumption (exclude toilets) divided by the gross floor area of a retail mall, reflecting its usage for operations per gross floor area annually.

2. annual water consumption of toilets in a retail mall divided by the number of shoppers and days in the same year, reflecting the amount of water used per shopper daily.

For more details about retail benchmarks, click on image to download [PDF].

Water Efficiency Benchmark Retail
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School benchmarks

Based on data collected from about 300 educational institutions (primary and secondary schools, as well as junior colleges), it is found that toilets are their main water usage areas. 

For more details about school benchmarks, click on image to download [PDF].

Water Efficiency Benchmark School
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Wafer fabrication and semiconductor plants benchmarks

For the wafer fabrication and semiconductor plants sector, recycling rate is computed using the total recycled water of a plant divided by summation of the total supplied water and recycled water.

For more details about wafer fabrication and semiconductor plants benchmarks, click on image to download [PDF].

Water Efficiency Benchmark Wafer Fab
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Best Practice Guide for Water Efficiency - Buildings

With the data and information gathered from the submission of water efficiency management plans by large water users, PUB has developed a publication - Best Practice Guide For Water Efficiency  ( Buildings ) - in consultation with the industry.  The aim of this guide is to provide professional engineers, developers, building owners, facilities managers and managing agents, who are involved in water management, with basic knowledge of designing, maintaining and operating a water-efficient building.

Best Practice Guide
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