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Castletown Bathing Water Profile

Sufficient bathing water qualityCurrent water quality classification is Sufficient, based on weekly samples taken from 2019 to 2023.


Castletown beach is a good location for family activities, water sports, horse riding and dog walking (subject to summer restrictions). During the bathing season there is a swimming raft installed for the public to enjoy. 

The horseshoe-shaped bay of Castletown, offers sandy stretches and pebbly coves.

Castletown town centre is a short walk away where facilities such as cafes, restaurants, public toilets/showers, shops and recycling facilities. There is also access to a first aid kit and defibrillator at Castletown Town Hall and Castle Rushen High School. 

For more information on Castletown, visit the Visit Isle of Man website.

Samples takenWeekly throughout the bathing season
2019 classification **Good
2020 classification **Good
2021 classification **Good
2022 classification *Sufficent
2023 classification *Sufficient
Local authority Castletown Town Commissioners
Water sampling point SC 273 677
QR Code Castletown QR code

Water Quality Results 

See the help page for additional information on interpreting these charts.

Escherichia coli (EC)


Castletown - Water Quality sample results charts 2024 - Escherichia coli (EC)

2020 to 2023

Castletown - Water Quality sample results charts historic (2020-2023) - Escherichia coli (EC)

Intestinal Enterococci (IE)


Castletown - Water Quality sample results charts 2024 - Intestinal Enterococci (IE)

2020 to 2023

Castletown - Water Quality sample results charts historic 2020-2023 - Intestinal Enterococci (IE)

Catchment Description

Castletown surface water catchment boundary map

The catchment surrounding Castletown is approximately 27.8 km². The Silverburn discharges into the bay near to the designated bathing water. The surrounding catchment is mainly urban so highway and surface water drains will discharge into the bay.

Pollution Risk Forecasts

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.

Investigations Statement

The Environmental Protection Unit is not currently investigating any pollution incidents within this catchment. To report any water pollution; please call +44 1624 685885 or email

Pollution Management

It is the Environmental Protection Unit's 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.

Stream and Rivers

Catletown streams and rivers map

Streams and rivers are typically affected by human sewage, animal slurry and run off from roads.

The Silverburn discharges into the bay near to Castletown beach. There is also a surface water drain from the premises of King Williams College and nearby residences which discharges onto the beach.

The annual report on the routine water quality monitoring data is produced by the Environmental Protection unit and can be viewed at the River water quality page.

Any reports of pollution will be investigated by officers and water samples collected if necessary.

Working with Manx Utilities

Castletown combined sewer overflows map

The urban area of Castletown is served by surface water, foul water and combined sewer networks. These networks are maintained by Manx Utilities with the foul waste being transported to Meary Veg sewage treatment works via the IRIS network.

There are combined sewer overflows from pumping stations at The Hole and Castletown Beach which are not likely to impact on the bathing water quality.

Working with Local Authorities

Surface water can flow into the sea from outfalls and highway drains. This can affect water quality, particularly after periods of rainfall.

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 because of such events.

Working with the farming community

During and after periods of heavy rainfall, run off from agricultural areas is greatly increased, and the quality of the bathing water may be adversely affected. The Environment Protection Unit are working with farmers to encourage better farming practices and improve water quality in the surrounding areas.

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