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

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Sea water monitoring

2023 monitoring calendar and results

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Source: Natural Environment

cfu = colony forming units

< = is less than the given value

Results from Jersey are submitted to the Marine Conservation Society for inclusion in the UK Good Beach Guide.

The above ratings are a weekly snapshot of bathing water quality, however, the full classification is calculated annually for each bathing water site, based on all of the samples from the previous 4 years.

Excellent Water Quality 3 Stars

Excellent Water Quality: Indicates this sample meets the following standard:

less than or equal to 250 Escherichia coli per 100ml

less than or equal to 100 Intestinal enterococci per 100ml​

​​Good Water Quality 3 Stars

​Good Water Quality: Indicates this sample meets the following standard:

less than or equal to 500 Escherichia coli per 100ml

less than or equal to 200 Intestinal enterococci per 100ml

Poor Water Quality 3 StarsPoor water indicates values are above 500 Escherichia coli per 100ml and above 200 Intestinal enterococci per 100ml​

We monitor sea water as part of the Bathing Water Directive.

The quality of sea water around Jersey's coast is important for a number of reasons:

  • the health of the public swimming in those bays and for those involved in water sports
  • detection of pollution within the environment
  • providing information to the aquaculture industry, for example oyster or mussel farming

Jersey prides itself on having some of the cleanest beaches in Europe.  Results from Jersey are submitted to the Marine Conservation Society for inclusion in the UK Good Beach Guide

2023 Sea water monitoring schedule

The 2023 season runs from Monday 15 May to Tuesday 26 September, with the most recent results reported in the table at the top of this page.

May15 and 16 May 2023
May22 and 23 May 2023
May30 and 31 May 2023
June5 and 6 June 2023
June12 and 13 June 2023
June20 and 21 June 2023
26 and 27 June 2023
July3 and 4 July 2023
July10 and 11 July 2023
July17 and 18 July 2023
July24 and 25 July 2023
August1 and 2 August 2023
10 and 11 August 2023
14 and 15 August 2023
August21 and 22 August 2023
29 and 30 August 2023
September4 and 5 September 2023
September11 and 12 September 2023
September18 and 19 September 2023
​25 and 26 September 2023

The 16 bays around Jersey monitored include:

  • St Brelade Bay
  • Beauport
  • Portelet
  • Le Braye
  • Plémont
  • Greve de Lecq
  • Watersplash
  • Bonne Nuit
  • La Haule
  • Victoria Pool
  • Grouville
  • Archirondel
  • Havre des Pas
  • Green Island
  • Bouley Bay
  • Rozel

For ensuring accuracy and consistency a duplicate sample and analysis is carried out each week by the Official Analysts laboratory.

​​​​Quality of sea water

The sampling of sea water is carried out by officers from Natural Environment Department based at Howard Davis Farm, Telephone +44 (0) 1534 441600. If you observe pollution on the beach or in the sea, call the Pollution hotline on +44 (0) 1534 709535.

Water safety for swimming

The bathing water data is provided to Public Health each week and they make the decision in consultation with other stakeholders. If the results are poor, they will notify the media recommending swimming is not advised and suitable signage would be provided at the relevant bays. To contact Public Health call +44 (0) 1534 445808 or email

Sea water profiles

A profile has been produced Jersey's monitored sea waters. 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 sea water profile

Beauport sea water profile

Bonne Nuit sea water profile

Bouley Bay sea water profile

Green Island sea water profile

Greve de Lecq sea water profile

Grouville sea water profile

Havre des Pas sea water profile

La Haule sea water profile

Le Bray sea water profile

Plémon sea water profile

Portelet sea water profile

Rozel sea water profile

St Brelade's Bay sea water profile

Victoria Pool sea water profile

Watersplash sea water profile

When sea water quality monitoring started

Monitoring started in 1992. We now classify our beaches following guidance from the European Directive and by the World Health Organisation.

From 2015 bathing water classifications throughout Europe are based on sampling data collected over 4 years.

Historic data is available from Natural Environment. Call +44 (0) 1534 441600 or email

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