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Wastewater Services

Guernsey Water has a responsibility to remove wastewater from all properties on the island and treat it appropriately for return into the environment. We are also responsible for the surface water infrastructure on the island, which transports run-off from streams, properties and roads safely out to sea.


Beneath the island's roads is a network of foul water sewer pipes totaling approximately 167km that collect sewage from around 80% of domestic households. These sewer pipes, collectively referred to as the sewerage system, are cleaned, maintained and inspected on a regular basis so as to ensure satisfactory performance throughout the life of the asset.

Pumping Station

There are 55 pumping stations which transport wastewater to the Belle Greve Wastewater Centre, where non-biodegradable matter over 6mm in diameter is removed from the flow by mechanical screens. Grit, which would otherwise damage pipelines and pumps, is also removed. The resulting wastewater is then discharged through a long sea outfall pipe which extends more than 2km out into the fast flowing waters of the Little Russel.

Ultra-Violet (UV) rays of the sun and the natural wave action together with massive dilution provide the current bacteriological breakdown, such that any effects from the outfall are virtually eliminated once more than 20 to 30 metres away. This was backed up by scientific evidence provided by global water quality experts Intertek, who carried out an in-depth study of our bathing waters back in 2011, which can be viewed by clicking the button below.

pdf icon Intertek Metoc 2011 Study [4Mb]

The surface water drainage system is a combination of douits, ditches, channels, culverts, pipes and 9 pumping stations that take rainwater and any other liquid run-off from the land (a surface water outfall is shown in the image below). Many landowners throughout the Island share the responsibility for ensuring that these are kept clear from debris that would otherwise block the flow of water and cause flooding.

A typical outfall

In times of exceptionally heavy rainfall and when the main sewerage system cannot cope with the flows from combined systems then 'stormwater' (a mixture of rainwater and diluted sewage) overflows into the surface water drainage system. Such occurrences are carefully monitored as the frequency of these 'spills' is an indication as to the operational efficiency of the foul water network.

Most modern properties (built after 1970) have separate foul-water and surface-water pipes. Properties built prior to this, or in areas where there is not a dual pipe system, have what is termed 'combined drainage'. This means that rainfall significantly increases flows into the foul water system.  As part of Guernsey Water's Surface Water Management Policy, we are encouraging separation and attenuation of surface water into the foul network. This will also mean reduced costs to transport flows to our Belle Greve Wastewater Centre.

Network Extension

There are in the region of 4,000 properties that are not presently connected directly onto the public sewer network and these have storage tanks, known as cesspits, which have a legal obligation to be watertight and which are emptied regularly by road tankers. The sewage is taken by road to locally convenient points on the sewerage system where it is discharged.

Previous business plans have prioritised sewer network extensions to provide connections to those properties not currently served by our 'main drain'; however the cost of this is high when compared with the limited environmental and public health benefits. Therefore a detailed review of this strategy was undertaken and a report submitted to the States assembly. As a result, our previous target of a 95% customer connection rate has been rescinded in favour of including this activity in our investment plans as other priorities allow. This means that we have not planned to carry out any further sewer extensions before 2022, which will allow us to focus our resources on tackling the higher priorities of flooding and pollution from sewer overflows.


Sewage Collection

If you have a cesspit on your property, you will need to arrange for your sewage to be removed from your property by the sewage tanker fleet.

There are two options available for the collection of your sewage. You can either:

  • Arrange ad-hoc sewage collections by telephoning in advance.
  • Set up a permanent regular booking e.g. 1 load every 2 weeks (depending on your individual circumstances)

Please contact States Works Sewerage Collection Department by calling 01481 245938 or emailing for advice and to make the necessary arrangements.


The subsidised sewage collection charge for 2020 is £7.32 per load. All charges are reviewed on an annual basis.


In an out-of-hours emergency, an additional charge will be levied. If a cesspit urgently needs emptying or it is overflowing outside of office hours, please call 01481 245938 and select the emergency line

Payment of Accounts

Customers are billed on a quarterly basis and payment can be made as follows:

  • Direct Debit - please telephone 01481 245938 to set up this convenient facility
  • Card payments - in person at Edward T Wheadon House or by telephoning 01616 279977
  • Cheque - can be sent by post or paid in person. Make payable to 'States Sewage Department'
  • By post: payment of accounts must be sent to The Cashier's Desk, Level 3, Edward T Wheadon House, Le Truchot, St Peter Port, GY1 3WH
  • In person: at Edward T Wheadon House (same address as above), or at the following Post Offices - Cobo, Smith Street or Envoy House
  • Online by visiting or following the link below

Pay your sewage account online


Sewage collection orders (random collections) and account enquiries - 01481 245938 or

Your Responsibilities

If you have a cesspit on your property, you are responsible for having it emptied at appropriate intervals to ensure that it does not overflow. Sewage that overflows from a cesspit is not only unpleasant, but it can also have an environmental impact if it enters streams.

Guernsey Water works with Environmental Health to ensure that overflowing cesspits are quickly identified and remedied. If a person is found to knowingly let a cesspit overflow, legal action could be brought against them. If you believe that a cesspit is overflowing on the Island, or you believe that sewage has entered a stream, please contact Guernsey Water on telephone number 01481 239500 as soon as possible.

If you notice that your cesspit needs regular emptying in wet, wintry weather, but less in the dry, summery conditions, then the structural integrity of your pit may be compromised, and there may be water ingress issues. If this is the case, then you may need to get your cesspit checked by an expert.

If your property is vacated or becomes connected to the public sewer you are responsible for the cancellation of any regular order in writing.


Responsibility to our customers and the environment

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