| Target parameter | Surrogate | Correlation between target parameter and surrogate | Range of target parameter concentration |
| mg/L | |||
| Dissolved methane | ORP | −r = 0.70 - 0.90 | 0 - 6.24 |
| DO | −r = 0.18 - 0.98 | ||
| TDS | EC | r = 0.99 - 1 | 0 - 210 |