Blue-Green Algae in Cumbria and Lancashire

Closes 31 Oct 2024

Opened 15 Jul 2020


Blue-Green Algae is a naturally occurring environmental phenomenon which becomes more likely during periods of warm, dry weather. It’s growth is exacerbated by nutrient pollution which contributes to the formation of blooms in the right conditions.

We have set up this page to provide information on known Blue-Green Algae locations in Cumbria and Lancashire  

Blue-Green Algae poses a small risk to human health if a person comes into direct contact with it. It can also be a risk to animals such as dogs who may swim in or drink from affected water. 

There is information on Blue Green Algae at the links below, including a link to a map of known blooms on specific waterbodies in Cumbria and Lancashire. 

It is possible that any lake or waterbody not included on the map could still be affected by Blue Green Algae. You should visually assess all water you plan to enter and avoid contact with it if you have any concerns.

If you suspect Blue Green Algae in other locations that are not on this map, please contact our 24 hour hotline on 0800 80 70 60. 

Blue Green Algae Blog

Blue Green Algae Flyer

Blue Green Algae Poster

2024 Algal Bloom Information Cumbria & Lancashire

Blue Green Algae Map 170524

Blue Green Algae Map Windermere 170524

Give Us Your Views

This page has been published to provide information on known Blue-Green Algae locations in Cumbria and Lancashire. It is not part of a consultation.


  • Recreational and commercial river users
  • Fishing clubs and representative associations
  • Members of the public with an interest in the river, the species and conservation
  • Businesses
  • Charities
  • Statutory organisations
  • Members of the public
  • Elected representatives, including MPs
  • Local councils
  • All water abstractors
  • Environment Agency customers


  • Business and industry
  • Water quality
  • Drought
  • Habitats and wildlife
  • Specific projects, issues, or activity pages