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Wirtschaftsbetrieb Mainz (AÖR)
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4th purification stage

26.5.2025: Second funding decision received from the state

Mainz’s wastewater is set to become significantly cleaner. To that end, Wirtschaftsbetrieb Mainz is expanding the city’s wastewater treatment plant with a fourth treatment stage.

View from above of the speakers in front of guests and the press

Following an initial grant notification for 6.5 million euros last year, Climate Protection Minister Katrin Eder has now presented the Wirtschaftsbetrieb Mainz with a second grant notification for 4 million euros. With this, the state of Rhineland-Palatinate is supporting the project with a total of 10.5 million euros, which corresponds to approximately 30 percent of the total costs.

Group photo with Jeanette Wetterling, Chairwoman of the Board of Management, SGD President

The fourth treatment stage will enable even better filtration of trace substances from wastewater in the future, i.e., minute pollutants such as pharmaceuticals, cosmetics, and pesticides.

Commissioning is planned for 2027.     

Graphic of the fourth cleaning stage on the ZKW site
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