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How Does a Water Audit Work?



An audit can show how much water efficiency measures can save — and what they will cost


By James Piper, P.E.   Green

OTHER PARTS OF THIS ARTICLEPt. 1: This PagePt. 2: Steps in a Water Audit

Water has long been the forgotten utility. It was inexpensive. It was perceived to be plentiful. And there were few incentives for conservation. No more. Population growth, economic development, aging infrastructures and ongoing regional droughts are causing trouble for municipal water systems that are trying to keep up with rising demand. Facility executives are facing rapidly rising rates, water use restrictions or both.

Some water utilities are implementing maximum water-use levels, with economic penalties should a facility exceed the limit. The challenge for facility executives is to find ways to reduce water use without interfering with facility operations.

The good news is those facilities that have implemented a comprehensive water conservation program have found that the return on investment is becoming easier to justify. To achieve savings, what is needed is a program designed to address all aspects of water use within a facility.

Thirty years ago, when energy conservation became an important issue, many facility executives responded by turning down thermostats and removing fluorescent lamps. And while these strategies did produce some savings, they did not fully address the issue of energy conservation. Areas with even greater energy-saving potential went unaddressed simply because they were overlooked or not fully understood. To produce more savings than could be achieved through quick cutbacks, facility executives turned to the energy audit. The energy audit proved to be the most effective tool in helping manage energy use.

An energy audit helps facility executives identify and quantify what steps can be taken to reduce energy use. But even more importantly, it gives facility executives a detailed survey and analysis of how energy is used within their facilities. The same process is needed today to reduce water use.

Water Use Audits

Water use audits, like their energy counterparts, are an important first step toward understanding both a facility’s water use and what can be done to reduce it. They trace water use from its point of entry into the facility through its discharge into the sewer. They identify each point of water use within and around the facility and estimate the quantity of water used at each of these points. They identify and quantify unaccountable water losses and possible leaks. They provide facility executives with a road map of potential savings, as well as implementation costs.

In addition to water quantity, water use audits should also take into consideration water quality. Some of the largest potential savings that can be achieved is through the recycling of water or the use of rain water. Water audits can help identify potential uses for alternative sources of water.

A comprehensive water use audit will examine all of the major areas in which a facility uses water, including sanitation, maintenance, mechanical systems, building processes and irrigation. For each of those areas the water use audit will provide a breakdown of the how, when and where of water use.


Continue Reading: The Role of Water Use Audits

How Does a Water Audit Work?

Steps in a Water Audit

posted on 8/1/2008

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