Water Quality – Don't get sick doing what you love

Blue-green algae thrive in warm and nutrient rich waters and can develop very quickly – sometimes in a matter of hours.

Some can cause eye irritation, dermatitis and joint/muscle pain or, more seriously, gastroenteritis, pneumonia.

How can I avoid blue-green algae?

Look out for the iridescent blue green colour, which can look like paint. If you can't tell, carefully insert a stick into the water and remove, if it comes out covered in what looks like green paint it is likely blue green algae.

Is there any signage warning of blue green algae?

Signs may be erected if the relevant authorities are aware of the presence of blue-green algae. If you suspect blue-green algae is present, but there are no notices, assume your observation is correct and report it to the Environment Agency's 24hr hotline: 0800 80 70 60

Has the water temperature increased?

If you are using the same water regularly this can help identify the most likely time for algal blooms to appear and therefore the best time to paddle, to minimise risk.

Is there an annual cycle to the blooms?

The frequency, duration and magnitude of any algal blooms may tend to follow an annual cycle, which can be avoided.

Has any previous water quality testing taken place?

Visual checks are usually adequate to undertake before paddling, however there may be a history of testing if/when blooms are present in the water body, which will help inform your planning.

Weil's disease is a form of bacterial infection carried by animals, often rats. It's rare in the UK.

You can catch Weil's disease anywhere where you're likely to come into contact with infected animal urine, but most likely on the water's edge.

The infection enters the body via cuts or abrasions of the skin or the lining of the nose, mouth, throat or eyes.

The symptoms are very similar to flu, and can occur anytime up to three weeks after paddling.

What can I do to avoid Weil's disease?

It is not possible to assess if Weil's disease is present in any waters through observation. It is highly recommended to follow our safety advice regarding good hygiene.

Testing is more likely to be considered when a paddler has a confirmed case and is able to highlight where and when they have been paddling.