Les Granges

18.9°C Water temp · Jun 8

France Coastal 2 - Good 18.9°C

Satellite image of LES GRANGES — Satellite image © Esri

Plage des Barges and Plage des Granges are bathing beaches in Billiers, Brittany. The beaches are located in a coastal commune with significant seasonal tourism. Water quality monitoring data from 1998 to 2023 shows contamination linked to rainfall, tidal coefficients, and river discharge from the Vilaine. The beaches experience microbiological contamination primarily from faecal sources during wet weather events.

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Water

Coastal bathing waters in Brittany, France. The area is influenced by the Vilaine River, which discharges into the bay. Tidal range and river discharge significantly affect water conditions at the bathing beaches.

Location

Billiers, Brittany. Plage des Barges and Plage des Granges are the two designated bathing areas in the commune. A barrier at Plage des Granges restricts vehicle access over 2.10 m in height. Parking is available above Plage des Barges for vans.

Facilities

Public toilets located on rue du Port. Information panels at beach entrances. Dog waste bag dispensers installed at Plage des Granges entrance. Information signage regarding beach regulations at both locations.

Season

Official monitoring period: 15 June to 15 September.

Water Quality

Water quality classification based on E. coli and intestinal enterococci concentrations according to EU standards. Contamination is seasonal, with higher levels from June to September. Contamination events correlate with rainfall exceeding 10 mm in the preceding 24 hours, tidal coefficient, and Vilaine River discharge. Primary sources include collective sewerage network overflows, non-collective wastewater treatment systems, and agricultural runoff. The sewage treatment plant (STEP Lestly) and refoulement station at Pen Lan are documented pollution sources.

Risks

E. coli and intestinal enterococci contamination following rainfall. Algal proliferation potential documented. Marine bird faecal sources. Domestic animal waste. Unsanitary wastewater discharges in stormwater networks. Combined sewer overflows from the sewerage system.