2024 Bathing Water Profile for Poole Harbour Lake
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Poole Harbour Lake is in Poole Harbour on the Dorset coast. It is a quiet sand and mud beach, approximately 340 metres wide, surrounded by a nature reserve.
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Bournemouth, Christchurch and Poole
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Dorset
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The storm overflow at the Kings Arms pumping station in Stoborough was improved by Wessex Water in February 2002. The sewage treatment works (STWs) at Poole, Wareham and Lytchett Minster were upgraded with ultraviolet disinfection by April 2003. The storm overflow in Upton (Moorlands Way) and five other storm overflows to Poole Harbour were also improved at that time. Holton Heath STW was closed in 2013 and effluent is now pumped to Wareham STW.
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For the four year (2020-2023) assessment period where data is available, seaweed (macroalgae) was assessed as being sufficient to be objectionable for 11% of visits, with 89% of visits noting the presence of seaweed (macroalgae). This bathing water does not have a history of large amounts of seaweed (macro algae).
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For the four year (2020-2023) assessment period where data is available, phytoplankton (microscopic algae) was not assessed as being sufficient to be objectionable, but was observed as being present on 5% of visits. Phytoplankton (microscopic algae) naturally increase in number at certain times of the year. This process is known as a phytoplankton bloom. This bathing water does not have a history of phytoplankton blooms. The risks to human health from contact, ingestion or inhalation with marine algae that currently occur in UK coastal waters are considered to be low. However, some individuals may be more sensitive and display some reactions. A common marine algae found in UK coastal waters is Phaeocystis, which is often mistaken for sewage as it forms foam and a brown scum, but it is non-toxic.
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The Environment Agency makes a daily pollution risk forecast at this site based on the effects of rain, tide, wind and sunlight on bathing water quality. These factors affect the levels of bacteria that get washed into the sea from livestock, sewage and urban drainage via rivers and streams and how they disperse. When these factors combine to cause a temporary reduction in water quality, we will issue a pollution risk warning on this website. Water quality will typically return to normal after a day or so, but it’s possible to have several warning days in a row. Details of the work to reduce the sources of bacteria at this bathing water are detailed in this profile. In 2023 1 pollution risk warnings were issued for this bathing water. All bathing waters have the potential to be affected by a pollution incident and if this occurs a pollution risk warning will be issued with associated advice against bathing on this website.
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2024 Bathing Water Profile for Poole Harbour Lake
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2024-09-30
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2024-05-01
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Sewage from the Poole area is pumped to Poole STW. The outfall from Poole STW discharges to Holes Bay in Poole Harbour. This discharge is disinfected and designed to protect bathing water quality.
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Environment Agency samplers make observations of litter present on the beach at every visit, this includes assessments of sewage debris, litter and tar. At Poole Harbour Lake for the four year (2020-2023) assessment period where data is available, sewage debris was not noted at this site. Litter was assessed as being sufficient to be objectionable for 14% of visits, with 84% of visits noting the presence of litter. Tarry residue was not noted at this site.
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The catchment surrounding Poole Harbour Lake is approximately 86,500 hectares and includes the rivers Piddle, Frome, Corfe, and Sherford. These rivers drain from the Dorset Downs and flow into Poole Harbour which is one of the largest and shallowest natural harbours in the world. The Piddle and Frome are approximately 30 kilometres (km) and 43km long respectively and flow to Wareham, where they both enter Poole Harbour via Wareham Channel. The River Corfe is approximately 11km long (including tributaries) and flows parallel to the Purbeck ridge to Corfe Castle. It is joined by a number of streams before entering the harbour through the Wych Channel. The River Sherford is approximately 12km long and flows from Bere Regis in the Wareham Forest to Lytchett Bay on the northern side of Poole Harbour. The steep slopes at the top of the catchment mean rain runs off rapidly into the rivers. Further down the catchment the valleys broaden and there is a more gradual response to rainfall runoff. The majority of the land in the catchment is agricultural with mixed livestock and arable. The urban area of Poole surrounds the bathing water and includes caravan parks and recreational areas.
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Poole Harbour Lake
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Poole Harbour Lake
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Sampling point at Poole Harbour Lake
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398313
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50.71383032434879
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-2.025252753585668
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90468
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Sampling point at Poole Harbour Lake
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p152 dT23 h59 m59 s
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2024 05 01 t00:00:00
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2024-05-01T00:00:00
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2024 09 30 t23:59:59
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2024-09-30T23:59:59
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2024 19400:1
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Seaweed (macroalgae) and phytoplankton (microscopic algae) are a natural part of the marine and freshwater environment. Below we note whether these have been recorded in quantities sufficient to be a nuisance.
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The majority of sewers in England are “combined sewers” and carry both sewage and surface water from roofs and drains. A storm overflow operates during heavy rainfall when the sewerage system becomes overwhelmed by the amount of surface water. The overflow prevents sewage from backing up pipes and flooding properties and gardens. An emergency overflow will only operate infrequently, for example due to pump failure or blockage in the sewerage system.
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Heavy rain falling on pavements and roads often flows into surface water drains or highway drains, ending up in local rivers and ultimately the sea. The quality of bathing water may be adversely affected as a result of such events.
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It is the Environment Agency role to drive improvement of water quality at bathing waters that are at risk of failing higher standards. It is natural for water to run off the land to the sea. Water quality at a bathing water is dependent upon the type and area of land (the catchment) draining to the water and the activities undertaken in that catchment.
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Discharges from sewage treatment works have improved substantially in England since the 1980s.
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