Almost all of the inhabitants of the province of North Holland live below sea level. Hoogheemraadschap Hollands Noorderkwartier (HHNK), the water authority for the northern part of the province, ensures that all 1.2 million residents are able to work and live in safety.
HHNK ensures clean municipal water and safe waterways by providing sewage purification, road and bridge maintenance, and water crisis management. HHNK also helps municipalities in low-lying areas mitigate the risks of rising sea levels and changing weather conditions. By monitoring more than 1,400 kilometers of dikes and dunes along the coastline and lakes, HHNK helps to prevent flooding in these areas.

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