Overview
- With the season now active, provinces tell people to swim only at official sites that are checked from May through October.
- Noord-Holland adds a new designated spot in Hoorn as the regional service inspects hygiene and safety at its official swim locations.
- Zuid-Holland sets permanent no‑swim advice at Plas Slingeland and Oude Tol after four years of poor scores, and issues 2026 warnings for PFAS at Plas Vrijenburgbos and Kralinger Esch and for a suctioning bottom at Oostvoornse Meer–Zuidzijde.
- Nationwide checks already flag several dozen locations with warnings or negative advice because of blue‑green algae, poor water quality or other hazards, and two nature-water sites in Gelderland carry outright bans.
- Zwemwater.nl and the Zwemwater app provide live water quality, current advice and site facilities across about 950 official locations so families can choose safer places to swim.