One of Anglian Water’s fundamental goals is to deliver a reliable supply of clean and safe drinking water to its customers. We appreciate that this water is used for many other purposes – including keeping fish.

Water quality standards are designed to ensure that tap water is safe for humans to drink. Tap water may require further treatment to make it suitable for fish keeping. Ask your local aquarium supplier’s advice on any specialised treatments and equipment you may require. This is particularly important for marine and tropical fish. We also recommend you follow the steps below:

  • Always use water from a mains-fed cold tap and allow water to run for a few minutes to remove any water that has been standing in contact with pipework. This water can be collected and used for watering plants. Fish can be sensitive to trace amounts of metals from water in contact with pipework in the home.
  • Tap water is generally colder than water in fish tanks and aquariums, and can be colder than pond water in summer months. Fish can be sensitive to changes in temperature and rapid changes can cause them to go into shock. Run water into a clean container and allow to stand for several hours to reach room temperature before adding to your pond or tank.
  • Chlorine is present in drinking water to provide disinfection and is highly toxic to fish. Chlorine must be allowed to completely dissipate before the water is added to the pond or tank. It is recommended that tap water is left to stand in a clean container for at least 24 hours before use. Alternatively, water can be pre-treated using other methods to de-chlorinate water; your local aquarium supplier will be able to help with this.

Further advice on fish keeping can be obtained from your local aquarium supplier.

If you are setting up an aquarium and require more detailed information (such as chlorine/chloramine levels and nitrate) please use our  postcode search to find out more about the water in your area.