Correction to: Environ Sci Eur (2021) 33:1 https://doi.org/10.1186/s12302-020-00446-y

Following publication of the original article [1], the authors identified an error in Fig. 1. The correct figure is given below.

Fig. 1
figure 1

Number of public sites with residue contamination for each season. Percentage of contaminated sites for each season in parenthesis (N = 24 sites per season). p-values denote differences in relation to the winter season as reference (Fishers-exact test with Bonferroni correction)