Water Usage Statistics

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Our goal with water usage was to use water at a fraction of a level of a traditional commercial office building. We did this in a variety of ways, from selection of efficient plumbing fixtures to reduction of use of city water through the use of cisterns. Our data is below.

Our 2 cisterns, prior to placement. The larger cistern, 1,400 gallons, is under our parking lot, and the smaller, 500 gallons, is on top of our 3-season room. Both are fed with water coming from our roof.
Our 2 cisterns, prior to placement. The larger cistern, 1,400 gallons, is under our parking lot, and the smaller, 500 gallons, is on top of our 3-season room. Both are fed with water coming from our roof.

Contents

Measurement Decisions

  • The statistics come from our monthly City of Detroit water bills.
  • Unit of measure = gallons (water dept measures in cu, where 1cu = 100 cubic feet = 728 gallons)
  • 'Usage Per Person' is calculated based on the number of people that are in Businesses-in-Residence at the beginning of each month, plus the number of volunteers and paid contractors that work more than 2 days a week.

Sources of Water

  • Our water comes from the City of Detroit Water and Sewerage Department, which gets its water from the Detroit River and Lake Huron.
  • Water for outside use comes from 2 cisterns, one on top of our roof, and one under our parking lot. Together, they collect about 2,000 gallons of water.

Uses of Water

  • 4 Toilets (@ 1.28 gal/flush)
  • 5 Sinks
    • 3 Bathroom (0.5 gal/min + automated)
    • 1 Kitchen
    • 1 Mop-basin
  • 2 Dishwasher (4 gal / load)
  • 1 Shower (2.5 gal/min shower head)
  • Coffee / Drinking
  • Outdoor watering. We harvest the water that we use for outdoor watering in 2 cisterns (1,700 gallons total) and only use city water when the other water is exhausted. Our goal is to use no city water for outdoor use.

Water Usage Charts

Green Garage Monthly Water Usage - August 2013 - August 2014
Green Garage Monthly Water Usage - August 2013 - August 2014


  • We used 3,740 gallons for 99 people in August 2014.



Monthly Water Usage Comparison Chart - August 2013 - August 2014
Monthly Water Usage Comparison Chart - August 2013 - August 2014





Monthly Water Costs - August 2013 - August 2014
Monthly Water Costs - August 2013 - August 2014


  • In August 2014 we spent about $67 on water with a population of 99 people in the building.



Monthly Water Costs per Person - August 2013 - August 2014
Monthly Water Costs per Person - August 2013 - August 2014



Past Water Usage Charts

Monthly Water Usage

  • Please note that in October 2012 we had a valve that didn't close on one of the toilets, causing it to run all weekend, which caused the spike in water usage. A repair was made and the problem has not recurred.


Monthly Water Usage Comparison to Industry Standard


Monthly Water Costs


Water Costs per Person

See Also

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