Office Greywater

Spend $300 now and SAVE $36 each year... ROI = 12%

Americans typically use two to three times as much water a day—100 gallons per person—as the average European. Over the winter we use about 80 gallons per day but it increases to 120 per day over the summer mostly due to the water used for watering the landscaping and lawns of offices and homes. The average cost of office water per employee per year is $37.89. This average comes from 2,400 gallons per year for toilets and sinks @ $.0015/gallon plus 45 gallons for water cooler drinking at $3.81/gallon. The Greywater systems filter the sink water and in the case of residential properties they also filter showers and then re-use the water for toilets and landscaping. For offices, the average employee may use about 1,200 gallons a year for washing their hands and rinsing out coffee mugs.

Since the average price of water in the United States is only about $1.50 for 1,000 gallons, water costs less than a penny a gallon. The cost of the re-usable sink water per employee is only $1.80 each per year. Needless to say the Greywater strategy works better for offices with more than ten employees. The cost of water used by employees in a typical office environment is significantly lower than home use by individuals, and the office cost of water is typically rolled into the lease due to the complexity of splitting out meters within a building. For small offices consider the outside rain barrel water cisterns for landscaping as an alternate approach to conservation. Small scale Greywater filtration systems can cost from $250 to $350 vs. larger scale systems that cost between $1,500-$5,000. The ROI Calculation is based on the lower end of the cost range at $300 for a small office of 20 employees saving $36 per year.

Payback Time in Years: Added Cost: Annual SAVINGS 5 Year SAVINGS Return on Investment (ROI):
8.3 $300 $36 $180 12.0%


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