Earlier this year we published the paper "Estimating pesticides in public drinking water at the household level in Denmark" in the diamond open-access journal "GEUS Bulletin". In this blog-post I have collected my twitter thread about the paper.
Good morning! I'm happy to present our new paper (co-authors: @JorgSchullehner, @BirgitteH_GEUS & our @SyddanskUni colleagues), where we 1) assessed the #Pesticides status of Danish #drinkingwater, and 2) estimated the #exposure at household level. (🧵1/n) https://t.co/VVH1OtiZ0B pic.twitter.com/oe05ppfzIX— Denitza Voutchkova (@DenitzaV) April 16, 2021
(2/10) We take advantage of Jupiter database (https://t.co/dRXYyZAFAc), where all DK drinking water samples are centrally registered. It's a great source, but stringent quality control is usually required. We disclose data-handling procedures & discuss in detail data-limitations.— Denitza Voutchkova (@DenitzaV) April 16, 2021
(3/10) The ‘clean’ dataset represents 3004 public waterworks in Denmark, incl. 39798 samples of treated #drinkingwater analyzed for 449 pesticides (971723 analyses) for the period 2002–2019. #Pesticides here refers also to their metabolites, degradation, and reaction products. pic.twitter.com/ehMm40DaK7— Denitza Voutchkova (@DenitzaV) April 16, 2021
(4/10) We found that 9% (2002–2019) and 7% (2015–2019) of the public waterworks had exceedance of the drinking water standard (>0.1 μg/l) at least once; and, 20% and 17% of waterworks contained #pesticides with lower concentrations (0.03–0.10 μg/l) for the two respective periods. pic.twitter.com/T9UWdj5ea2— Denitza Voutchkova (@DenitzaV) April 16, 2021
19% (2002–2019) and 11% (2015–2019) of the Danish households were potentially exposed to pesticides from drinking water in concentrations exceeding the EU drinking water standard. Here’s my #dataviz entry for ‘part-to-whole’ #30DayChartChallenge (6/10) pic.twitter.com/4u8mH1Ea4u— Denitza Voutchkova (@DenitzaV) April 16, 2021
(7/10) These exposure estimates may be on the conservative side, as some areas are supplied by multiple waterworks (see Fig 2). That’s why we looked further into this issue and provided uncertainty assessment. Also, because one of the reviewers suggested we do so 🙂 pic.twitter.com/iYtM5xcNp2— Denitza Voutchkova (@DenitzaV) April 16, 2021
(9/10) To conclude: we show that pesticide pollution of Danish drinking water is widespread & not only an issue of local importance. The lower number of exceedances in the past 5y compared to 2002–2019 may indicate that the water utilities are addressing compliancy issues.— Denitza Voutchkova (@DenitzaV) April 16, 2021
(10/10) This work was funded by the Karen Elise Jensen Fond (2017–2021). Read the details (open access) @GeusBulletin https://t.co/VVH1OtiZ0B— Denitza Voutchkova (@DenitzaV) April 16, 2021
Our colleagues Carina Skaarup, Kirstine Wodschow, and Annette K. Ersbøll from @SyddanskUni will investigate the health implications.