Graywater refers to water that has passed through a faucet or a shower that would otherwise flow to a sewage treatment plant; recycled graywater can be used in toilets, and in some cases for irrigation or constructed wetlands.
Used to calculate:water used inside and graywater recycled
Varies by: lifestyle
| Used | lifestyle | Reference | Location: Ecosystem (study period) |
Value | Units | Notes |
|---|
| * | Average American | Rosener et al. 2006 ... Effects of Landscape Irrigation Using Household Graywater... | USA: Buildings () | 0.4 | proportion (0-1) | "Excluding faucet contributions the indoor graywater flow is 40% of total indoor water usage." See study by Mayer et al. 1999. |
| * | Average Earthling | Assumed | New York City: Urban Area () | 0.4 | proportion (0-1) | see average American |
| * | Average New Yorker | Assumed | New York City: Urban Area () | 0.4 | proportion (0-1) | see average American |
| * | Eco-conscious | Assumed | New York City: Urban Area () | 0.4 | proportion (0-1) | see average American |
| * | Lenape Person | Assumed | New York City: Mannahatta () | 0 | proportion (0-1) | We assume no graywater recycling by the Lenape on Mannahatta in 1609 |