| Analysis | Number of analyses |
|
| 2151 |
|
| 1189 |
|
| 55 |
| Total residual chlorine Cl2 | 1850 |
| Temperature | 2176 |
| Escherichia coli | 1767 |
| Clostridium perfringenss | 954 |
| Coliforms | 1755 |
| THM | 61 |