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Water Quality

The Langstone Harbour Board takes water quality extremely seriously. Although not designated as a bathing water, the Environment Agency routinely tests the harbour water for parameters including bacterial and heavy metal content. The Environment Agency is also responsible for investigating any pollution incidents which may occur in Langstone Harbour.

If you witness any pollution incidents in the harbour, please contact the Environment Agency Pollution Reporting Line on 0800 807060 (this is a 24 hour FREEPHONE number).


Improvements to the Southern Water sewage treatment plant at Budds Farm at the northern end of the harbour, including the construction of a 5.7km sea outfall under the harbour which takes waste water from the pumping station at Eastney out to sea, have resulted in great improvement in the water quality of the harbour in recent years. Southern Water are also running a ’Keep it Clear’ campaign, encouraging customers to dispose of items such as sanitary waste and medicines responsibly, rather than via the waste water system where they can cause blockages exacerbating the problems associated with Storm Water Discharges.

Issues still arise during periods of heavy rainfall, when storm water (a mixture of rain and untreated sewage) is discharged directly into the harbour from several locations. Pressure from the Langstone Harbour Board has resulted in Southern Water providing us with discharge notification documents, allowing us to keep harbour users informed. Discharge notifications from Southern Water are posted on this website as they are received. To determin the location of the discharge Southern Water recommend inserting the site location numbers (next to E and N) on the notification document into the relevent boxes on this website. This will drop a pin on a map illustrating the location of the site.

If you would like to be added to the Langstone Harbour Board’s e-mail disribution list for storm water discharges, please email a request to


In line with best practice advice, the Langstone Harbour Board recommends that all recreational boat users have a holding tank for sewage installed on their boat. Only environmentally friendly cleaning and disinfection products should be used on board, as regular products are toxic to marine life. Use ’Pump Out’ facilities to empty your holding tank. There are Pump Out facilities available in Southsea Marina, and both Portsmouth Harbour to the west, and Chichester Harbour to the east have Pump Out facilities. To see a directory of UK Pump Out facilities click here.


Oils, diesels and all other petrochemicals pose a serious risk to the marine environment. Oils are extremely toxic, affecting the reproduction, growth and feeding capabilities of many marine species, as well as entering our own food chain.

A single litre of oil can contaminate over 1 million litres of water, and under the Water Resources Act 1991 it is an offence to deliberately or accidentally discharge pollutants such as diesel, contaminated bilge water or oil into any waterway, including coastal waters.

By following the Best Practice Advice offered by The Green Blue, you can eliminate the risk of oil entering the marine environment. In line with this advice, the Langstone Harbour Board recommend that all harbour users install bilge socks in their vessels. More information about bilge socks can be obtained from the Langstone Harbour Board office, where bilge socks are also available to purchase.


In the event of an oil spill in Langstone Harbour, the Langstone Harbour Board holds an amount of oil spill clean up equipment, and has a number of staff members trained to deal with clean up.

The oil spill contingency plan for Langstone Harbour is called LANGSPILL, and is scrutinised and updated regularly. The plan is held by local authorities and emergency services, and training excercises involving these organisations are regularly held.
Discharge Notifications
24th July 2017 (1)
21st July 2017 (1)
13th July 2017 (3)
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30th January 2017 (2)
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16th January 2017 (1)
13th January 2017 (2)
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View Archived Discharge Notifications
Langstone Harbour Board, Ferry Road, Hayling Island, Hampshire, PO11 0DG Tel: (023) 9246 3419
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