The proposal outlines a new method for assessing which watercourses in Dalarna are affected by acidification. According to the current methodology, 43% of Dalarna's watercourses are considered acidic. However, under the new assessment, this figure would drop dramatically to just 1%. This change has raised concerns among various stakeholders, especially in regions such as Blekinge, Kalmar, Skåne, Dalarna, and Kronoberg, where the impact of this new evaluation method is set to be most significant. Many express skepticism and oppose the implementation of these new criteria for assessing acid levels in water.

Officials emphasize that the new calculation model aims to increase accuracy in distinguishing between naturally acidic areas and those affected by acid rain. This is particularly relevant for Dalarna, where natural acidity in water is a common characteristic. Researcher Jens Fölster from SLU highlights that while the reduction in the classification of acidic water may be scientifically justified, the ecological impacts must also be considered, particularly concerning species such as the freshwater pearl mussel which could suffer if liming ceases altogether.

The prospect of discontinuing liming raises questions about the long-term ecological balance in the region. If the freshwater pearl mussel populations cannot reproduce effectively due to increased acidity, there may still be a strong case for continuing liming efforts despite the new classification models. The debate reflects broader environmental issues faced in balancing human intervention with natural ecosystems, underscoring the importance of informed decision-making in environmental management.