Data, measured at the water source, on the quality of water is essential for both the delivery of services and the prevention of diseases. In order to satisfy the minimum requirements for this category, data should be available on level of the following chemicals by water source.
| Rank | Place | Breakdown | Year | Score | Admin |
|---|---|---|---|---|---|
| 1 | Curitiba |
|
2017 | 60% | |
| 2 | Rio de Janeiro |
|
2017 | 45% | |
| 3 | São Paulo |
|
2017 | 35% |