2019 Bathing Water Profile for Seaton (Devon)
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Seaton is a resort town in Lyme Bay on the south coast of Devon. It is a shingle beach approximately one kilometre wide, and the River Axe Estuary enters the sea through a small harbour at the eastern end of the bathing water.
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East Devon
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Devon
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The Environment Agency investigations have shown that the bathing water quality at Seaton beach can be affected by the River Axe at some states of the tide.
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The storm/emergency overflow from the Harbour Road pumping station, discharges to the Axe Estuary one and a half kilometres northeast of the Environment Agency monitoring point at Seaton beach. The operation of the overflow can lead to a temporary drop in bathing water quality. This bathing water is included in the Surfers Against Sewage “Safer Seas Service”. This service can alert you to Combined Storm Sewer Overflow discharges via a phone App and in addition, it includes the Environment Agency Pollution Risk Forecast warnings where they are available. Further details of the service can be found at - http://www.sas.org.uk/safer-seas-service/
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Seaton sewage treatment works (STW) has discharged secondary treated effluent to the River Axe since 1986. The South West Water sewage treatment scheme for Seaton, which provides secondary treatment and ultraviolet (UV) disinfection, was completed in 2002. Storm tanks and screens were installed at the STW in April 2003, and work to reduce the frequency of storm spills at Axmouth pumping station was also carried out at that time. CSO event duration monitoring was installed at Seaton STW, Axmouth and Harbour Road pumping stations in April 2011.
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The urban area of Seaton immediately behind the beach is served by a combined (surface and sewer) system. There are a number of small outfall of pipes along the promenade that drain surface water from the surrounding area.
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For the four year (2015-2018) assessment period where data is available, seaweed (macroalgae) was not assessed as being sufficient to be objectionable, but was observed as being present on 63% of visits. This bathing water does not have a history of large amounts of seaweed (macro algae).
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For the four year (2015-2018) 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 1% of visits. Phytoplankton (microscopic algae) naturally increase in number at certain times of the year. This process is known as a phytoplankton bloom. These blooms can discolour the water or form as a foam on the water. 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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This bathing water is subject to short term pollution. Short term pollution is caused when heavy rainfall or high tides wash faecal material into the sea from livestock, sewage and urban drainage via rivers and streams. At this site the risk of encountering reduced water quality increases after rainfall and typically returns to normal after 1-3 days. The Environment Agency makes daily pollution risk forecasts based on rainfall and tidal patterns and will issue a pollution risk warning if high tides or heavy rainfall occurs to enable bathers to avoid periods of increased risk. The Environment Agency works to reduce the sources of this pollution through pollution prevention measures, work with agriculture and water companies. 6 warnings advising against swimming due to an increase risk of short term pollution were issued in 2018 for Seaton (Devon) bathing water. These warnings were issued because of the effects of heavy rain on the water quality.
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2019 Bathing Water Profile for Seaton (Devon)
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2019-09-30
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2019-05-01
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Streams and rivers are typically affected by human sewage, animal slurry and runoff from roads. Seaton is close to the estuary of the River Axe which can affect bathing water quality after heavy rainfall. The Environment Agency have monitored the River Axe at the beach since 1987.
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The Seaton STW outfall discharges to the River Axe Estuary two and a half kilometres from the bathing water. 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 Seaton (Devon) for the four year (2015-2018) assessment period where data is available, sewage debris was not noted at this site. Litter was not assessed as being sufficient to be objectionable, but was observed as being present on 48% of visits. Tarry residue was not noted at this site.
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There are more than 50 farms in the catchment, most of which are dairy, beef, and arable. During and after periods of heavy rainfall, runoff from agricultural areas in the steeper areas of the upper catchment to the River Axe is greatly increased, and the quality of the bathing water may be reduced. The Environment Agency are working with Natural England and farmers on Catchment Sensitive Farming programmes to encourage better farming practices and improve water quality in the surrounding areas.
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The Environment Agency have worked with businesses on the small industrial estate at Harbour Road to ensure there is no affect on the bathing water quality from this site. The car park of a planned supermarket in Seaton will have a sustainable urban drainage (SUDs) system fitted which filters water before it enters the River Axe.
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The Environment Agency has worked with local businesses and holiday lets to resolve private drainage issues.
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The catchment surrounding Seaton is approximately 40,300 hectares. The River Axe is 35 kilometres long and rises near Beaminster in Dorset. It is joined by the Yarty and Coly tributaries and becomes tidal three kilometres inland at Colyford. The porous nature of the geology beneath the River Axe catchment causes the river to respond relatively slowly to rainfall compared with other rivers in East Devon. The Axe Estuary is a bar-built estuary containing extensive mudflats, saltmarsh and reed beds. At low tide, islands are formed across the intertidal mudflats, isolated by a narrow channel. The estuary enters the sea at Axmouth near Seaton. The catchment is known for its valuable visual landscape and includes parts of the Blackdown Hills, East Devon and Dorset Areas of Outstanding Natural Beauty (AONBs). There are also four Special Areas of Conservation (SAC), one Special Protection Area (SPA), 29 Sites of Special Scientific Interest (SSSI's), and 118 Scheduled Monuments. The catchment is mostly agricultural, with more than 50 farms.
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Seaton (Devon)
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Seaton (Devon)
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Sampling point at Seaton (Devon)
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324500
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50.70335620945877
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-3.070515206918154
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89850
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Sampling point at Seaton (Devon)
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p152 dT23 h59 m59 s
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2019 05 01 t00:00:00
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2019-05-01T00:00:00
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2019 09 30 t23:59:59
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2019-09-30T23:59:59
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2019 21600:1
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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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