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5.

Determination of LOQ for each annual record;

• known LOQ: in Waterbase – Water Quality, the LOQ of the analytical method used is requested to be reported with each single or annual record (for the latter, the highest LOQ in a series of measurements within a year should be reported, although typically the same analytical method is used at the site throughout the year);
• unknown LOQ but flagged as “below LOQ”: some records in the database are only flagged as “below LOQ”; for these, the actual LOQ is uncertain, but the fact that they are below means their EQS or threshold value exceedance can be determined (see next point);
• no data or flags regarding the LOQ are available for a record at all.