Pumping stations per water authority: most Hoogheemraadschap Hollands Noorderkwartier (2,293 pumping stations), then Wetterskip Fryslân and Hoogheemraadschap van Rijnland

Pumping stations per water authority, October 2026, in pumping stations. Total: 8,565; the largest 12 of 21 categories are shown. Hoogheemraadschap Hollands Noorderkwartier is 27% of the total. Counted from the waterbeheerder field of each pumping station. How finely a water authority registers its pumping stations differs.