| Coliform (cfu/100 mL) | ||
| Location | 2017 | 2018 |
| 1a | 5,040 | 2,420 |
| 1b | 7,720 | 1,820 |
| 1c | 1,800 | 900 |
| 1d | N/A | 4,260 |
| 2a | 320 | 3,000 |
| 2b | 920 | 620 |
| 2c | 2,640 | 280 |
| 2d | N/A | 5,940 |
| 3a | 2,240 | 1,620 |
| 3b | 3,120 | 1,520 |
| 3c | 2,040 | 1,320 |
| 3d | N/A | 5,320 |
| 4a | 2,200 | 8,300 |
| 4b | 7,960 | 1,240 |
| 4c | 1,240 | 6,180 |
| 4d | N/A | 2,500 |