Vast amounts of polluted domestic and industrial waste water are generated in Flevoland. Each time the toilet is flushed, the bath is emptied or the washing machine is used, polluted water flows into the sewers. Businesses also produce waste water, with some industrial companies producing huge volumes. This water has to go somewhere. And to top it all, plenty of water drops from the skies and is collected in roof guttering and drains in the road where some is directed into the sewers.
All told, more than a quarter of a billion cubic metres of waste water flows through the sewers of Flevoland annually. All this water wends its way to one of Zuiderzeeland Regional Water Authority’s five waste water treatment plants. These plants treat the polluted water - mostly using micro-organisms present in nature itself - and then discharge the treated water back into the surface waters.
Waste water treatment is funded by the taxpayer. For the sake of the environment, and due to the costs, the Zuiderzeeland Regional Water Authority tries to limit the generation of polluted water. This is done by ensuring that businesses meet strict requirements before being awarded a permit to discharge waste water.
Furthermore, the Zuiderzeeland Regional Water Authority is trying to ensure, often in cooperation with municipalities, that clean rainwater is no longer directed to the waste water treatment plants. After all, that water is not really polluted. This demands laying separate sewers: one for rainwater and one for domestic waste water. Though this is an expensive operation in existing residential areas, it is much cheaper when included at the design stage of new residential areas.
In this way, the Zuiderzeeland Regional Water Authority ensures well-treated water at the lowest possible cost.