Data and updating

This pre-core test indicator and its threshold values are yet to be commonly agreed in HELCOM and the presented thresholds are furthermore not currently approved EQS values, but provisional proposals.
The indictor is included as a test indicator for the purposes of the 'State of the Baltic Sea' report, and the results are to be considered as intermediate.

Access and use

The data and resulting data products (tables, figures and maps) available on the indicator report can be used freely, given that the source is cited. The indicator should be cited as follows:

HELCOM (2018) Diclofenac. HELCOM pre-core indicator report. Online. [Date Viewed], [Web link].

ISSN 2343-2543



The current data are very variable and somewhat disparate, being gathered from scientific publications, reports and data compilations. All sources are presented in the reference list where possible. The majority of measurements are from WWTPs, though some have been taken from rivers, estuaries and biota. Metadata will be updated in subsequent versions and made available via the HELCOM data and mapping services at that stage.

Data sources are referenced where possible. Monitoring data is often not published in the same formats as other reference material and where data is referenced as HELCOM DATA CALL then this data refers to data reported to HELCOM by national contact points for each individual country. All HELCOM countries reported data during the process and the 2017 DATA CALL (PRESSRURE and State&Consevation 2017) referenced above included the following information:

  1. WWTP data from: Denmark (6 influent mean values, 6 effluent mean values, and 6 sludge mean values), Finland (28 influent values of which 3 were mean values, 31 effluent values of which 3 were mean values, and 2 sludge values of which one was a mean value), Germany (259 effluent values), Latvia (2 influent values, and 6 effluent values of which 5 were mean values), Sweden (17 effluent values, and 3 sludge values), and Russia (8 mean influent and 8 mean effluent values).
  2. River data from: Denmark (17 items, of which 5 were 'less-than'note below values), Estonia (56 items, of which 54 were 'less-than' values), Finland (62 items, of which 25 were 'less-than' values, and 15 were mean values), Germany (2164 items, of which 1208 were 'less-than' values), Latvia 15 items, of which 14were 'less-than' values), Lithuania (4 items, of which 4 were 'less-than' values), Poland (180 items), and Sweden (8 items, of which 1was a 'less-than' value).
  3. Open sea and coastal waters: All together 60 observation were reported for the period 2014 and 2017 with data supplied by Denmark, Germany, Latvia, Poland and Sweden. Only 3 observations out of 60 had analytical limits higher than the threshold value identified for marine water. Presence of diclofenac in marine water was identified in 8 samples and the GES threshold was exceeded in 5 cases.

Note below This term is used for data that have values below the technical limits of quantification (LOQ) of the used equipment. It does not indicate anything in relation to the threshold values (for which river data are not compared in the current report) but these data are not included in the summary tables above. In the future these issues should be addresses to consider river data against possible threshold values and a suitable incorporation of 'less-than' value data in the assessment.