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L'înformâtion et les sèrvices publyis pouor I'Île dé Jèrri

Sea water monitoring

​​​​Quality of sea water

The sampling and analysis of sea water is carried out by the Department of the Environment. The quality of sea water around Jersey’s coast is important for a number of reasons:

  • the health of the public swimming and those involved in water sports
  • pollution of the environment
  • Jersey tourism prides itself on having some of the cleanest beaches in Europe
  • aquaculture industry eg oyster or mussel farming

Most popular beaches

Sea water at 14 of the most popular beaches around Jersey is monitored up to 20 times between mid May to the end of September each year. Bathing waters are classified annually based on samples collected from the previous four years. The classifications are 'Excellent', 'Good', 'Sufficient' and 'Poor'. Water samples are tested for the bacteria Escherichia coli and intestinal enterococci, which indicate whether there is faecal matter in the water. The annual classifications are shown in the sea water profiles.

Results from Jersey are independently verified by the Centre for Research into Environment and Health (CREH) and submitted to The Marine Conservation Society for inclusion in the UK Good Beach Guide. CREH produce an annual report of the Island’s sea water.

2016 monitoring calendar and results

Article 3(1) of the revised Bathing Water Directive requires sea waters to be identified on an annual basis. The length of the sea water season is to be defined each year.

The 2016 season will start on Wednesday 18 May and finish on Tuesday 27 September.

It is also a requirement to establish a monitoring calendar to identify days when water samples will be collected.

Bathing water season and calendar 2016 (size 14kb)

Download Bathing water results week 10 (size 20kb)

Download Bathing water results week 9 (size 40kb)

Download Bathing water results week 8 (size 39 kb)

Download Bathing water results week 7 (size 40kb)

Download Bathing water results week 6 (size 40kb)

Download Bathing water results week 5 (size 39kb)

Download Bathing water results week 4 (size 39kb)

Download Bathing water results week 3 (size 40kb)

Download Bathing water results week 2 (size 21kb)

Download Bathing water results week 1 (size 39kb)

2015 sea water quality ​results

During the 2015 summer season ten of Jersey’s sea waters were of 'Excellent' quality, five were 'Good' quality and one was 'Sufficient' quality.

'Excellent' quality classification

  • Archirondel
  • Beauport
  • Green Island
  • Grève de Lecq
  • Havre Des Pas
  • Le Braye
  • Plémont
  • Portelet
  • St Brelade
  • Watersplash

'Good' quality classification

  • ​​Bouley
  • Grouville
  • ​Le Haule
  • Rozel
  • Victoria Pool

'Sufficient' quality classification

  • ​​Bonne Nuit

Jersey bathing water executive summary (size 243kb)

Sea water profiles

A profile has been produced for each of Jersey's monitored sea waters. As well as providing useful information they are a requirement of the revised Bathing Water Directive. Each profile includes:

  • a photograph, description, map of the sea water and surrounding area
  • an identification of potential sources of pollution and measures to reduce pollution
  • the telephone number to report water pollution and contact details for further information

Archirondel (size 396kb)

Beauport (size 378kb)

Bonne Nuit (size 521 kb)

Bouley Bay (size 488kb)

Green Island (size 525kb)

Greve de Lecq (size 489kb)

Grouville (size 706kb)

Havre des Pas (size 620kb)

La Haule (size 508kb)

Le Braye (size 444kb)

Plémont (size 418kb)

Portelet (size 401kb)

Rozel (size 453kb)

St Brelade's Bay (size 462kb)

Victoria Pool (size 519kb)

Watersplash (size 479kb)

When did sea water quality monitoring begin?

Monitoring started in 1992. Since then the Department of the Environment has been instrumental in developing the protocols for measuring sea water quality which are now used in a European directive and by the World Health Organisation.

From the start of the 2012 bathing season the type of bacteria that were monitored changed. These changes are a requirement of the reviewed Bathing Water Directive, based on recommendations from the World Health Organisation.

From 2015 bathing water classifications throughout Europe are based on sampling data collected over four years.

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