Roybon - Lac De Roybon

France Lake 1 - Excellent

Lac de Roybon is a lake located in the Roybon municipality in Haute-Savoie, France. The bathing site has been subject to water quality monitoring and analysis by regional health authorities (ARS) since 2011. The lake receives water from two main tributaries: the Aigue Noire stream and the Oursière stream. Water quality classification has been evaluated based on bacteriological analyses and compliance with EU Bathing Water Directive 2006/7/CE standards.

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Water

Freshwater lake. The catchment basin drains through the Aigue Noire and Oursière streams. Transfer times from upstream sources to the lake vary between approximately 30 minutes to several hours depending on weather conditions and stream flow rates.

Location

Roybon, Haute-Savoie, France. The nearest reference point is the Abbaye de la Trappe de Chambarand.

Water Quality

Water quality classification evaluated annually from 2011 to 2023 based on bacteriological analyses. Classification follows Directive 2006/7/CE standards. The site shows sensitivity to cyanobacteria blooms. Bacteriological parameters have been monitored over the 12-year period with historical data recorded in analysis reports.

Risks

Sensitivity to cyanobacteria blooms (both planktonic and benthic forms identified as potential risks). Contamination risks from non-collective sanitation systems identified in the catchment area. Pollution sources include collective sewerage systems and various agricultural activities in the watershed.