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The Groundwater Level Trend (GLT) is computed by fitting averaged annual groundwater level records with linear regression. The slope of this regression line (in metres per year; m/y) indicates the magnitude and direction (downward or upward) of the GLT. The significance of the trend is estimated with the Pearson’s p-value. If p > 0.05, then the calculated GLT is not significant. GLT is based on the methods of multi-year groundwater level trend analysis (e.g. Nguyen et al., 2021; Le Duy et al., 2021) and the Groundwater Table Declining Trend indicator (Hofste et al., 2019; Galvis Rodríguez et al., 2017).