How does the index deal with values below the analytical detection limit?
Another problem frequently encountered in reporting on water quality data is measurements that are below the detection limit for the analytical methods used. It is problematic to deal with these measurements statistically; however, the CCME WQI uses less than values as observations which are within the objectives (where the objective is higher than the level of detection), so the results are counted while circumventing all the statistical problems associated with them.
