Bureau of Waterworks Tokyo Metropolitan Government conducted a survey of water use in the home. Here is the breakdown of the average monthly water use in Tokyo by size of household, 2012.
Table: Monthly Water Use in Tokyo by Size of Household, 2012
| Numer of person in the household | Water use (m3) |
| 1 | 8.0 |
| 2 | 16.2 |
| 3 | 20.8 |
| 4 | 25.1 |
| 5 | 29.6 |
| 6 and over | 35.4 |
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