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Logo Noorderzijlvest Water Authority
Logo Noorderzijlvest Water Authority

Treated water

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

Treating used water

How do we treat used water? The water authority cleans the water again. This involves 55 million m³ of water per year. That is 55 billion litres.

Sludge processing

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

Sewage and rainwater

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