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Noorderzijlvest Water Authority logo
Noorderzijlvest Water Authority logo

Purified water

We all use water. The water board cleans this water again. This amounts to 55 billion liters of water per year.  

Purifying used water

How do we purify used water? The water board cleans the water again. This involves 55 million m3 of water per year. That is 55 billion liters.

Sludge processing

How do we process sludge? After treating wastewater, we are left with sewage sludge. In a sludge digestion plant, organic substances that are still present in the sludge are broken down.

Sewage and rainwater

In cities and towns, rainwater ends up in the municipal sewer system. The rainwater is transported via a combined or separate sewer system to a sewage treatment plant.