Dutch swimming waters fail all chemical quality standards

A study by Natuur & Milieu and the Netherlands Institute of Ecology (NIOO-KNAW) reveals that none of the investigated Dutch lakes or swimming areas fully meet chemical quality standards. After analyzing 205 official and 57 unofficial swimming locations, researchers concluded that the number of waters meeting all chemical requirements has dropped to zero.

While biological water quality showed slight improvements between 2015 and 2024, chemical pollution has worsened significantly compared to ten years ago, when 22 percent of tested waters still met the standards. Common contaminants identified include PFAS, pesticides, nitrogen, and phosphorus. The Jagersplas in Zaandam was noted as having eighteen substances in concentrations that exceed safety limits.

Researchers noted that while swimmers are unlikely to experience immediate health issues from a single dip, the widespread presence of these chemicals poses potential risks. The report suggests that government intervention currently focuses on blue-green algae and bacteria but neglects chemical pollution. To address this, the organizations advocate for tackling pollution at its source through stricter permit requirements and better monitoring of discharges.