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The Water Quality sampling program is not designed with wild swimmers in mind. Environmental monitoring samples are in the main not taken frequently enough to provide a reliable picture of current conditions.

The only database that explicitly deals with bathing waters is the Bathing Water Explorer: https://environment.data.gov.uk/bwq/profiles/#

 or the WFD classifications: https://environment.data.gov.uk/searchresults;query=WFD%20cycle%20classifications;page=1;pagesize=20;orderby=Relevancy