This dataset is a subset of the "WFD Classification Status Cycle 2" product and contains summary data for the element pH as used in the classification for Ecological status for the water framework directive (WFD). The pH classification dataset is an element of the physico-chemical group or element set and is used to consider particular phyisco-chemical conditions in rivers. pH is used to consider the acidic conditions of rivers. Classifications are derived from spot sampling monitoring data, the results of which are calculated into percentiles using a parametric method and assessed against two different environmental quality standards (EQS), one for acidity and another for alkalinity. These two assessments are then combined by choosing the poorer assessment to generate an overall pH water body classification using the categories of High, Good, Moderate, Poor, and Bad. Attribution statement: © Environment Agency copyright and/or database right 2015. All rights reserved.