SimplexHealth.co.uk works with a range of charities, action groups and organisations involved in environmental health, water quality monitoring, and public safety to conduct open water testing.

These include local authorities, water utilities, environmental agencies, and recreational bodies. Their services are essential for ensuring that open water bodies such as lakes, rivers, reservoirs, and coastal waters meet safety standards for public use, particularly for activities like swimming, boating, and fishing.

If you have a river or lake testing project you would like us to get involved in, please let us know.


SimplexHealth.co.uk provides expert testing for parameters such as microbial contamination, algae blooms, pH levels, dissolved oxygen, and other pollutants.

Our water laboratory testing helps to identify potential health risks to inform local councils, land owners and event organisers about the safety of the open water. This is particularly crucial during warm weather, when the risk of harmful algal blooms and bacteria levels rise.

We also work closely with charities and action groups plus TV & radio, we help ensure compliance with national and EU water quality standards, as well as promoting the protection of local ecosystems.

Read about the Big Windermere Survey

We also work closely with charities and action groups plus TV & radio, we help ensure compliance with national and EU water quality standards, as well as promoting the protection of local ecosystems.

SimplexHealth.co.uk uses state-of-the-art lab analysis and follows rigorous sampling protocols to provide accurate, reliable results. This enables stakeholders to take proactive measures to safeguard water quality and public health.

In summary, SimplexHealth.co.uk collaborates with a broad spectrum of entities, to conduct vital open water testing.

This partnership helps to ensure that open water sources remain safe for the public and environmentally sustainable.

Tests should be carried out regularly, ideally at the beginning of the swimming season, every 2-4 weeks throughout, before an event, when there are visible changes to the water, after heavy rainfall as well as at the end of the bathing season.

For more information on sampling, how often to test and how to understand the results of the test, refer to our guide Water Quality Testing for Open Water Swimming.

Our Wild Swimming Tests are suitable for: water from lakes, rivers, wells, springs, ponds, streams, sea water, estuaries (water with some salinity) etc

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