Drennec (Ouest)

France Lake 1 - Excellent

This report presents a revision of the bathing water profile for two beaches on Lac du Drennec: Stamadec in Commana and Drennec in Sizun, located in Brittany, France. The study, completed in April 2023, evaluates water quality, identifies pollution sources, and assesses risks related to bacteria and cyanobacteria. The lakes serve as recreational swimming areas subject to French and European bathing water regulations.

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Water

Lac du Drennec is a lake with a dam. The water body serves as the swimming location for both Stamadec and Drennec bathing zones.

Location

Stamadec beach is located in Commana (29450); Drennec beach is located in Sizun (29450). Both beaches are situated on Lac du Drennec in Brittany, France.

Water Quality

Water quality is monitored for microbiological parameters and cyanobacteria presence. The study includes historical monitoring of bacterial contamination, cyanobacterial cell densities, biovolumes, and associated toxins.

Risks

Potential pollution sources identified include agricultural activities, sanitation systems, stormwater runoff, natural flows, and wildlife. Cyanobacteria and associated toxins are monitored. Eutrophication and factors promoting cyanobacterial development are documented.