A proposed multi-purpose hall near the iconic Waldstadion in Frankfurt is igniting significant public debate, with local residents voicing serious concerns regarding its environmental impact and implications for the city’s water supply. Critics of the project, including the local residents’ group ‘Waldstadiongemeinschaft’, have expressed that the construction of the hall poses an ‘existential question’ regarding the protection of drinking water resources. They argue that the site’s proximity to the city’s water sources is alarming and that the area is not suitable for such development. Ongoing discussions reflect deep divisions in the community with proponents of the project suggesting potential economic benefits, while opposers underscore the ecological risks involved. Furthermore, the Stadtwerke Frankfurt (Frankfurt’s municipal utilities) have warned that the construction could jeopardize the drinking water supply. The controversy is compounded by concerns over increased traffic congestion that would accompany the facility’s operation as well as the potential loss of green spaces. Local spokesperson for the residents, Hans Müller, stated, ‘For us, this is not just a local issue but a regional one that affects the accessibility of clean drinking water for the future.’ As the debate continues, stakeholders are urging for a thorough environmental impact assessment to truly gauge the ramifications of the proposed hall on both the local ecosystem and the drinking water supply.