| Time | DO | pH | Escherichia coli biomass | Chroma |
| mg/L | cell/L | |||
| May | 2.0 | 6.8 | 1 | 20 |
| June | 2.5 | 6.6 | 0 | 15 |
| July | 2.4 | 6.7 | 0 | 5 |
| August | 2.5 | 6.8 | 0 | 15 |
| September | 2.8 | 6.8 | 2 | 15 |
| October | 3.9 | 7.3 | 0 | 6 |
| November | 3.4 | 6.9 | 0 | 5 |
| December | 2.3 | 6.5 | 0 | 5 |